/*
 *******************************************************************************
 * Copyright (C) 1996-2011, International Business Machines Corporation and    *
 * others. All Rights Reserved.                                                *
 *******************************************************************************
 */
package com.ibm.icu.dev.test;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintStream;
import java.io.PrintWriter;
import java.io.Writer;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.text.DecimalFormat;
import java.text.NumberFormat;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Comparator;
import java.util.HashMap;
import java.util.Locale;
import java.util.MissingResourceException;
import java.util.Random;

import com.ibm.icu.util.TimeZone;
import com.ibm.icu.util.ULocale;

/**
 * TestFmwk is a base class for tests that can be run conveniently from the
 * command line as well as under the Java test harness.
 * <p>
 * Sub-classes implement a set of methods named Test <something>. Each of these
 * methods performs some test. Test methods should indicate errors by calling
 * either err or errln. This will increment the errorCount field and may
 * optionally print a message to the log. Debugging information may also be
 * added to the log via the log and logln methods. These methods will add their
 * arguments to the log only if the test is being run in verbose mode.
 */
public class TestFmwk extends AbstractTestLog {
    /**
     * The default time zone for all of our tests. Used in Target.run();
     */
    private final static TimeZone defaultTimeZone = TimeZone.getTimeZone("PST");

    /**
     * The default locale used for all of our tests. Used in Target.run();
     */
    private final static Locale defaultLocale = Locale.US;

    public static final class TestFmwkException extends Exception {
        /**
         * For serialization
         */
        private static final long serialVersionUID = -3051148210247229194L;

        TestFmwkException(String msg) {
            super(msg);
        }
    }
    protected void handleException(Throwable e){
        Throwable ex = e.getCause();
        if(ex==null){
            ex = e;
        }
        if(ex instanceof ExceptionInInitializerError){
            ex = ((ExceptionInInitializerError)ex).getException();
        }
        String msg = ex.getMessage();
        if(msg==null){
            msg = "";
        }
        //System.err.println("TF handleException msg: " + msg);
        if (ex instanceof MissingResourceException || ex instanceof NoClassDefFoundError ||
                msg.indexOf("java.util.MissingResourceException") >= 0) {
            if (params.warnings || params.nodata) {
                warnln(msg);
            } else if (params.nothrow) {
                errln(msg);
                ex.printStackTrace();
            } else {
                ex.printStackTrace();
                throw new RuntimeException(msg);
            }
        } else {
            if (params.nothrow) {
                errln(msg);
                ex.printStackTrace();
            } else {
                errln(msg);
                ex.printStackTrace();
                throw new RuntimeException(msg);
            }
        }
    }
    // use this instead of new random so we get a consistent seed
    // for our tests
    protected Random createRandom() {
        return new Random(params.seed);
    }

    /**
     * A test that has no test methods itself, but instead runs other tests.
     *
     * This overrides methods are getTargets and getSubtest from TestFmwk.
     *
     * If you want the default behavior, pass an array of class names and an
     * optional description to the constructor. The named classes must extend
     * TestFmwk. If a provided name doesn't include a ".", package name is
     * prefixed to it (the package of the current test is used if none was
     * provided in the constructor). The resulting full name is used to
     * instantiate an instance of the class using the default constructor.
     *
     * Class names are resolved to classes when getTargets or getSubtest is
     * called. This allows instances of TestGroup to be compiled and run without
     * all the targets they would normally invoke being available.
     */
    public static abstract class TestGroup extends TestFmwk {
        private String defaultPackage;
        private String[] names;
        private String description;

        private Class[] tests; // deferred init

        /**
         * Constructor that takes a default package name and a list of class
         * names. Adopts and modifies the classname list
         */
        protected TestGroup(String defaultPackage, String[] classnames,
                String description) {
            if (classnames == null) {
                throw new IllegalStateException("classnames must not be null");
            }

            if (defaultPackage == null) {
                defaultPackage = getClass().getPackage().getName();
            }
            defaultPackage = defaultPackage + ".";

            this.defaultPackage = defaultPackage;
            this.names = classnames;
            this.description = description;
        }

        /**
         * Constructor that takes a list of class names and a description, and
         * uses the package for this class as the default package.
         */
        protected TestGroup(String[] classnames, String description) {
            this(null, classnames, description);
        }

        /**
         * Constructor that takes a list of class names, and uses the package
         * for this class as the default package.
         */
        protected TestGroup(String[] classnames) {
            this(null, classnames, null);
        }

        protected String getDescription() {
            return description;
        }

        protected Target getTargets(String targetName) {
            Target target = null;
            if (targetName != null) {
                finishInit(); // hmmm, want to get subtest without initializing
                              // all tests

                try {
                    TestFmwk test = getSubtest(targetName);
                    if (test != null) {
                        target = test.new ClassTarget();
                    } else {
                        target = this.new Target(targetName);
                    }
                } catch (TestFmwkException e) {
                    target = this.new Target(targetName);
                }
            } else if (params.doRecurse()) {
                finishInit();
                boolean groupOnly = params.doRecurseGroupsOnly();
                for (int i = names.length; --i >= 0;) {
                    Target newTarget = null;
                    Class cls = tests[i];
                    if (cls == null) { // hack no warning for missing tests
                        if (params.warnings) {
                            continue;
                        }
                        newTarget = this.new Target(names[i]);
                    } else {
                        TestFmwk test = getSubtest(i, groupOnly);
                        if (test != null) {
                            newTarget = test.new ClassTarget();
                        } else {
                            if (groupOnly) {
                                newTarget = this.new EmptyTarget(names[i]);
                            } else {
                                newTarget = this.new Target(names[i]);
                            }
                        }
                    }
                    if (newTarget != null) {
                        newTarget.setNext(target);
                        target = newTarget;
                    }
                }
            }

            return target;
        }
        protected TestFmwk getSubtest(String testName) throws TestFmwkException {
            finishInit();

            for (int i = 0; i < names.length; ++i) {
                if (names[i].equalsIgnoreCase(testName)) { // allow
                                                           // case-insensitive
                                                           // matching
                    return getSubtest(i, false);
                }
            }
            throw new TestFmwkException(testName);
        }

        private TestFmwk getSubtest(int i, boolean groupOnly) {
            Class cls = tests[i];
            if (cls != null) {
                if (groupOnly && !TestGroup.class.isAssignableFrom(cls)) {
                    return null;
                }

                try {
                    TestFmwk subtest = (TestFmwk) cls.newInstance();
                    subtest.params = params;
                    return subtest;
                } catch (InstantiationException e) {
                    throw new IllegalStateException(e.getMessage());
                } catch (IllegalAccessException e) {
                    throw new IllegalStateException(e.getMessage());
                }
            }
            return null;
        }

        private void finishInit() {
            if (tests == null) {
                tests = new Class[names.length];

                for (int i = 0; i < names.length; ++i) {
                    String name = names[i];
                    if (name.indexOf('.') == -1) {
                        name = defaultPackage + name;
                    }
                    try {
                        Class cls = Class.forName(name);
                        if (!TestFmwk.class.isAssignableFrom(cls)) {
                            throw new IllegalStateException("class " + name
                                    + " does not extend TestFmwk");
                        }

                        tests[i] = cls;
                        names[i] = getClassTargetName(cls);
                    } catch (ClassNotFoundException e) {
                        // leave tests[i] null and name as classname
                    }
                }
            }
        }
    }

    /**
     * The default target is invalid.
     */
    public class Target {
        private Target next;
        public final String name;

        public Target(String name) {
            this.name = name;
        }

        public Target setNext(Target next) {
            this.next = next;
            return this;
        }

        public Target getNext() {
            return next;
        }

        public Target append(Target targets) {
            Target t = this;
            while(t.next != null) {
                t = t.next;
            }
            t.next = targets;
            return this;
        }

        public void run() throws Exception {
            int f = filter();
            if (f == -1) {
                ++params.invalidCount;
            } else {
                Locale.setDefault(defaultLocale);
                TimeZone.setDefault(defaultTimeZone);

                if (!validate()) {
                    params.writeTestInvalid(name, params.nodata);
                } else {
                    params.push(name, getDescription(), f == 1);
                    execute();
                    params.pop();
                }
            }
        }

        protected int filter() {
            return params.filter(name);
        }

        protected boolean validate() {
            return false;
        }

        protected String getDescription() {
            return null;
        }

        protected void execute() throws Exception{
        }
    }

    public class EmptyTarget extends Target {
        public EmptyTarget(String name) {
            super(name);
        }

        protected boolean validate() {
            return true;
        }
    }

    public class MethodTarget extends Target {
        private Method testMethod;

        public MethodTarget(String name, Method method) {
            super(name);
            testMethod = method;
        }

        protected boolean validate() {
            return testMethod != null && validateMethod(name);
        }

        protected String getDescription() {
            return getMethodDescription(name);
        }

        protected void execute() throws Exception{
            if (params.inDocMode()) {
                // nothing to execute
            } else if (!params.stack.included) {
                ++params.invalidCount;
            } else {
                final Object[] NO_ARGS = new Object[0];
                try {
                    ++params.testCount;
                    init();
                    testMethod.invoke(TestFmwk.this, NO_ARGS);
                } catch (IllegalAccessException e) {
                    errln("Can't access test method " + testMethod.getName());
                }catch (ExceptionInInitializerError e){
                    handleException(e);
                } catch (InvocationTargetException e) {
                    //e.printStackTrace();
                    handleException(e);
                }catch (MissingResourceException e) {
                    handleException(e);
                }catch (NoClassDefFoundError e) {
                    handleException(e);
                }catch (Exception e){
                    /*errln("Encountered: "+ e.toString());
                    e.printStackTrace(System.err);
                    */
                    handleException(e);
                }
            }
            // If non-exhaustive, check if the method target
            // takes excessive time.
            if (params.inclusion <= 5) {
                double deltaSec = (double)(System.currentTimeMillis() - params.stack.millis)/1000;
                if (deltaSec > params.maxTargetSec) {
                    if (params.timeLog == null) {
                        params.timeLog = new StringBuffer();
                    }
                    params.stack.appendPath(params.timeLog);
                    params.timeLog.append(" (" + deltaSec + "s" + ")\n");
                }
            }
        }

        protected String getStackTrace(InvocationTargetException e) {
            ByteArrayOutputStream bs = new ByteArrayOutputStream();
            PrintStream ps = new PrintStream(bs);
            e.getTargetException().printStackTrace(ps);
            return bs.toString();
        }
    }

    public class ClassTarget extends Target {
        String targetName;

        public ClassTarget() {
            this(null);
        }

        public ClassTarget(String targetName) {
            super(getClassTargetName(TestFmwk.this.getClass()));
            this.targetName = targetName;
        }

        protected boolean validate() {
            return TestFmwk.this.validate();
        }

        protected String getDescription() {
            return TestFmwk.this.getDescription();
        }

        protected void execute() throws Exception {
            params.indentLevel++;
            Target target = randomize(getTargets(targetName));
            while (target != null) {
                target.run();
                target = target.next;
            }
            params.indentLevel--;
        }

        private Target randomize(Target t) {
            if (t != null && t.getNext() != null) {
                ArrayList list = new ArrayList();
                while (t != null) {
                    list.add(t);
                    t = t.getNext();
                }

                Target[] arr = (Target[]) list.toArray(new Target[list.size()]);

                if (true) { // todo - add to params?
                    // different jvms return class methods in different orders,
                    // so we sort them (always, and then randomize them, so that
                    // forcing a seed will also work across jvms).
                    Arrays.sort(arr, new Comparator() {
                        public int compare(Object lhs, Object rhs) {
                            // sort in reverse order, later we link up in
                            // forward order
                            return ((Target) rhs).name
                                    .compareTo(((Target) lhs).name);
                        }
                    });

                    // t is null to start, ends up as first element
                    // (arr[arr.length-1])
                    for (int i = 0; i < arr.length; ++i) {
                        t = arr[i].setNext(t); // relink in forward order
                    }
                }

                if (params.random != null) {
                    t = null; // reset t to null
                    Random r = params.random;
                    for (int i = arr.length; --i >= 1;) {
                        int x = r.nextInt(i + 1);
                        t = arr[x].setNext(t);
                        arr[x] = arr[i];
                    }

                    t = arr[0].setNext(t); // new first element
                }
            }

            return t;
        }
    }

    //------------------------------------------------------------------------
    // Everything below here is boilerplate code that makes it possible
    // to add a new test by simply adding a function to an existing class
    //------------------------------------------------------------------------

    protected TestFmwk() {
    }

    protected void init() throws Exception{
    }

    /**
     * Parse arguments into a TestParams object and a collection of target
     * paths. If there was an error parsing the TestParams, print usage and exit
     * with -1. Otherwise, call resolveTarget(TestParams, String) for each path,
     * and run the returned target. After the last test returns, if prompt is
     * set, prompt and wait for input from stdin. Finally, exit with number of
     * errors.
     *
     * This method never returns, since it always exits with System.exit();
     */
    public void run(String[] args) {
        System.exit(run(args, new PrintWriter(System.out)));
     }

    /**
     * Like run(String[]) except this allows you to specify the error log.
     * Unlike run(String[]) this returns the error code as a result instead of
     * calling System.exit().
     */
    public int run(String[] args, PrintWriter log) {
        boolean prompt = false;
        int wx = 0;
        for (int i = 0; i < args.length; ++i) {
            String arg = args[i];
            if (arg.equals("-p") || arg.equals("-prompt")) {
                prompt = true;
            } else {
                if (wx < i) {
                    args[wx] = arg;
                }
                wx++;
            }
        }
        while (wx < args.length) {
            args[wx++] = null;
        }

        TestParams localParams = TestParams.create(args, log);
        if (localParams == null) {
            return -1;
        }

        int errorCount = runTests(localParams, args);

        if (localParams.seed != 0) {
            localParams.log.println("-random:" + localParams.seed);
            localParams.log.flush();
        }

        if (localParams.errorSummary != null && localParams.errorSummary.length() > 0) {
            localParams.log.println("\nError summary:");
            localParams.log.println(localParams.errorSummary.toString());
        }

        if (localParams.timeLog != null && localParams.timeLog.length() > 0) {
            localParams.log.println("\nTest cases taking excessive time (>" +
                    localParams.maxTargetSec + "s):");
            localParams.log.println(localParams.timeLog.toString());
        }

        if (prompt) {
            System.out.println("Hit RETURN to exit...");
            System.out.flush();
            try {
                System.in.read();
            } catch (IOException e) {
                localParams.log.println("Exception: " + e.toString() + e.getMessage());
            }
        }

        return errorCount;
    }

    public int runTests(TestParams _params, String[] tests) {
        int ec = 0;

        StringBuffer summary = null;
        try {
            if (tests.length == 0 || tests[0] == null) { // no args
                _params.init();
                resolveTarget(_params).run();
                ec = _params.errorCount;
            } else {
                for (int i = 0; i < tests.length ; ++i) {
                    if (tests[i] == null) continue;

                    if (i > 0) {
                        _params.log.println();
                    }

                    _params.init();
                    resolveTarget(_params, tests[i]).run();
                    ec += _params.errorCount;

                    if (_params.errorSummary != null && _params.errorSummary.length() > 0) {
                        if (summary == null) {
                            summary = new StringBuffer();
                        }
                        summary.append("\nTest Root: " + tests[i] + "\n");
                        summary.append(_params.errorSummary());
                    }
                }
                _params.errorSummary = summary;
            }
        } catch (Exception e) {
            e.printStackTrace(_params.log);
            _params.log.println(e.getMessage());
            _params.log.println("encountered exception, exiting");
        }

        return ec;
    }

    /**
     * Return a ClassTarget for this test. Params is set on this test.
     */
    public Target resolveTarget(TestParams paramsArg) {
        this.params = paramsArg;
        return new ClassTarget();
    }

    /**
     * Resolve a path from this test to a target. If this test has subtests, and
     * the path contains '/', the portion before the '/' is resolved to a
     * subtest, until the path is consumed or the test has no subtests. Returns
     * a ClassTarget created using the resolved test and remaining path (which
     * ought to be null or a method name). Params is set on the target's test.
     */
    public Target resolveTarget(TestParams paramsArg, String targetPath) {
        TestFmwk test = this;
        test.params = paramsArg;

        if (targetPath != null) {
            if (targetPath.length() == 0) {
                targetPath = null;
            } else {
                int p = 0;
                int e = targetPath.length();

                // trim all leading and trailing '/'
                while (targetPath.charAt(p) == '/') {
                    ++p;
                }
                while (e > p && targetPath.charAt(e - 1) == '/') {
                    --e;
                }
                if (p > 0 || e < targetPath.length()) {
                    targetPath = targetPath.substring(p, e - p);
                    p = 0;
                    e = targetPath.length();
                }

                try {
                    for (;;) {
                        int n = targetPath.indexOf('/');
                        String prefix = n == -1 ? targetPath : targetPath
                                .substring(0, n);
                        TestFmwk subtest = test.getSubtest(prefix);

                        if (subtest == null) {
                            break;
                        }

                        test = subtest;

                        if (n == -1) {
                            targetPath = null;
                            break;
                        }

                        targetPath = targetPath.substring(n + 1);
                    }
                } catch (TestFmwkException ex) {
                    return test.new Target(targetPath);
                }
            }
        }

        return test.new ClassTarget(targetPath);
    }

    /**
     * Return true if we can run this test (allows test to inspect jvm,
     * environment, params before running)
     */
    protected boolean validate() {
        return true;
    }

    /**
     * Return the targets for this test. If targetName is null, return all
     * targets, otherwise return a target for just that name. The returned
     * target can be null.
     *
     * The default implementation returns a MethodTarget for each public method
     * of the object's class whose name starts with "Test" or "test".
     */
    protected Target getTargets(String targetName) {
        return getClassTargets(getClass(), targetName);
    }

    protected Target getClassTargets(Class cls, String targetName) {
        if (cls == null) {
            return null;
        }

        Target target = null;
        if (targetName != null) {
            try {
                Method method = cls.getMethod(targetName, (Class[])null);
                target = new MethodTarget(targetName, method);
            } catch (NoSuchMethodException e) {
        if (!inheritTargets()) {
            return new Target(targetName); // invalid target
        }
            } catch (SecurityException e) {
                return null;
            }
        } else {
            if (params.doMethods()) {
                Method[] methods = cls.getDeclaredMethods();
                for (int i = methods.length; --i >= 0;) {
                    String name = methods[i].getName();
                    if (name.startsWith("Test") || name.startsWith("test")) {
                        target = new MethodTarget(name, methods[i])
                                .setNext(target);
                    }
                }
            }
        }

        if (inheritTargets()) {
          Target parentTarget = getClassTargets(cls.getSuperclass(), targetName);
          if (parentTarget == null) {
            return target;
          }
          if (target == null) {
            return parentTarget;
          }
          return parentTarget.append(target);
        }

        return target;
    }

    protected boolean inheritTargets() {
        return false;
    }

    protected String getDescription() {
        return null;
    }

    protected boolean validateMethod(String name) {
        return true;
    }

    protected String getMethodDescription(String name) {
        return null;
    }

    // method tests have no subtests, group tests override
    protected TestFmwk getSubtest(String prefix) throws TestFmwkException {
        return null;
    }

    public boolean isVerbose() {
        return params.verbose;
    }

    public boolean noData() {
        return params.nodata;
    }

    public boolean isTiming() {
        return params.timing < Long.MAX_VALUE;
    }

    public boolean isMemTracking() {
        return params.memusage;
    }

    /**
     * 0 = fewest tests, 5 is normal build, 10 is most tests
     */
    public int getInclusion() {
        return params.inclusion;
    }

    public boolean isModularBuild() {
        return params.warnings;
    }

    public boolean isQuick() {
        return params.inclusion == 0;
    }

    public void msg(String message, int level, boolean incCount, boolean newln) {
        params.msg(message, level, incCount, newln);
    }

    protected int getErrorCount() {
        return params.errorCount;
    }

    public String getProperty(String key) {
        String val = null;
        if (key != null && key.length() > 0 && params.props != null) {
            val = (String)params.props.get(key.toLowerCase());
        }
        return val;
    }

    protected TimeZone safeGetTimeZone(String id) {
        TimeZone tz = TimeZone.getTimeZone(id);
        if (tz == null) {
            // should never happen
            errln("FAIL: TimeZone.getTimeZone(" + id + ") => null");
        }
        if (!tz.getID().equals(id)) {
            warnln("FAIL: TimeZone.getTimeZone(" + id + ") => " + tz.getID());
        }
        return tz;
    }

    /**
     * Print a usage message for this test class.
     */
    public void usage() {
        usage(new PrintWriter(System.out), getClass().getName());
    }

    public static void usage(PrintWriter pw, String className) {
        pw.println("Usage: " + className + " option* target*");
        pw.println();
        pw.println("Options:");
        pw.println(" -d[escribe] Print a short descriptive string for this test and all");
        pw.println("       listed targets.");
        pw.println(" -e<n> Set exhaustiveness from 0..10.  Default is 0, fewest tests.\n"
                 + "       To run all tests, specify -e10.  Giving -e with no <n> is\n"
                 + "       the same as -e5.");
        pw.println(" -filter:<str> Only tests matching filter will be run or listed.\n"
                 + "       <str> is of the form ['^']text[','['^']text].\n"
                 + "       Each string delimited by ',' is a separate filter argument.\n"
                 + "       If '^' is prepended to an argument, its matches are excluded.\n"
                 + "       Filtering operates on test groups as well as tests, if a test\n"
                 + "       group is included, all its subtests that are not excluded will\n"
                 + "       be run.  Examples:\n"
                 + "    -filter:A -- only tests matching A are run.  If A matches a group,\n"
                 + "       all subtests of this group are run.\n"
                 + "    -filter:^A -- all tests except those matching A are run.  If A matches\n"
                 + "        a group, no subtest of that group will be run.\n"
                 + "    -filter:A,B,^C,^D -- tests matching A or B and not C and not D are run\n"
                 + "       Note: Filters are case insensitive.");
        pw.println(" -h[elp] Print this help text and exit.");
        pw.println(" -l[ist] List immediate targets of this test");
        pw.println("   -la, -listAll List immediate targets of this test, and all subtests");
        pw.println("   -le, -listExaustive List all subtests and targets");
        // don't know how to get useful numbers for memory usage using java API
        // calls
        //      pw.println(" -m[emory] print memory usage and force gc for
        // each test");
        pw.println(" -n[othrow] Message on test failure rather than exception");
        pw.println(" -p[rompt] Prompt before exiting");
        pw.println(" -prop:<key>=<value> Set optional property used by this test");
        pw.println(" -q[uiet] Do not show warnings");
        pw.println(" -r[andom][:<n>] If present, randomize targets.  If n is present,\n"
                        + "       use it as the seed.  If random is not set, targets will\n"
                        + "       be in alphabetical order to ensure cross-platform consistency.");
        pw.println(" -s[ilent] No output except error summary or exceptions.");
        pw.println(" -tfilter:<str> Transliterator Test filter of ids.");
        pw.println(" -t[ime]:<n> Print elapsed time only for tests exceeding n milliseconds.");
        pw.println(" -v[erbose] Show log messages");
        pw.println(" -u[nicode] Don't escape error or log messages");
        pw.println(" -w[arning] Continue in presence of warnings, and disable missing test warnings.");
        pw.println(" -nodata | -nd Do not warn if resource data is not present.");
        pw.println();
        pw.println(" If a list or describe option is provided, no tests are run.");
        pw.println();
        pw.println("Targets:");
        pw.println(" If no target is specified, all targets for this test are run.");
        pw.println(" If a target contains no '/' characters, and matches a target");
        pw.println(" of this test, the target is run.  Otherwise, the part before the");
        pw.println(" '/' is used to match a subtest, which then evaluates the");
        pw.println(" remainder of the target as above.  Target matching is case-insensitive.");
        pw.println();
        pw.println(" If multiple targets are provided, each is executed in order.");
        pw.flush();
    }
    public static String hex(char[] s){
        StringBuffer result = new StringBuffer();
        for (int i = 0; i < s.length; ++i) {
            if (i != 0) result.append(',');
            result.append(hex(s[i]));
        }
        return result.toString();
    }
    public static String hex(byte[] s){
        StringBuffer result = new StringBuffer();
        for (int i = 0; i < s.length; ++i) {
            if (i != 0) result.append(',');
            result.append(hex(s[i]));
        }
        return result.toString();
    }
    public static String hex(char ch) {
        StringBuffer result = new StringBuffer();
        String foo = Integer.toString(ch, 16).toUpperCase();
        for (int i = foo.length(); i < 4; ++i) {
            result.append('0');
        }
        return result + foo;
    }

    public static String hex(int ch) {
        StringBuffer result = new StringBuffer();
        String foo = Integer.toString(ch, 16).toUpperCase();
        for (int i = foo.length(); i < 4; ++i) {
            result.append('0');
        }
        return result + foo;
    }

    public static String hex(CharSequence s) {
        StringBuilder result = new StringBuilder();
        for (int i = 0; i < s.length(); ++i) {
            if (i != 0)
                result.append(',');
            result.append(hex(s.charAt(i)));
        }
        return result.toString();
    }

    public static String prettify(CharSequence s) {
        StringBuilder result = new StringBuilder();
        int ch;
        for (int i = 0; i < s.length(); i += Character.charCount(ch)) {
            ch = Character.codePointAt(s, i);
            if (ch > 0xfffff) {
                result.append("\\U00");
                result.append(hex(ch));
            } else if (ch > 0xffff) {
                result.append("\\U000");
                result.append(hex(ch));
            } else if (ch < 0x20 || 0x7e < ch) {
                result.append("\\u");
                result.append(hex(ch));
            } else {
                result.append((char) ch);
            }

        }
        return result.toString();
    }

    private static java.util.GregorianCalendar cal;

    /**
     * Return a Date given a year, month, and day of month. This is similar to
     * new Date(y-1900, m, d). It uses the default time zone at the time this
     * method is first called.
     *
     * @param year
     *            use 2000 for 2000, unlike new Date()
     * @param month
     *            use Calendar.JANUARY etc.
     * @param dom
     *            day of month, 1-based
     * @return a Date object for the given y/m/d
     */
    protected static synchronized java.util.Date getDate(int year, int month,
            int dom) {
        if (cal == null) {
            cal = new java.util.GregorianCalendar();
        }
        cal.clear();
        cal.set(year, month, dom);
        return cal.getTime();
    }

    public static class NullWriter extends PrintWriter {
        public NullWriter() {
            super(System.out, false);
        }
        public void write(int c) {
        }
        public void write(char[] buf, int off, int len) {
        }
        public void write(String s, int off, int len) {
        }
        public void println() {
        }
    }

    public static class ASCIIWriter extends PrintWriter {
        private StringBuffer buffer = new StringBuffer();

        // Characters that we think are printable but that escapeUnprintable
        // doesn't
        private static final String PRINTABLES = "\t\n\r";

        public ASCIIWriter(Writer w, boolean autoFlush) {
            super(w, autoFlush);
        }

        public ASCIIWriter(OutputStream os, boolean autoFlush) {
            super(os, autoFlush);
        }

        public void write(int c) {
            synchronized (lock) {
                buffer.setLength(0);
                if (PRINTABLES.indexOf(c) < 0
                        && TestUtil.escapeUnprintable(buffer, c)) {
                    super.write(buffer.toString());
                } else {
                    super.write(c);
                }
            }
        }

        public void write(char[] buf, int off, int len) {
            synchronized (lock) {
                buffer.setLength(0);
                int limit = off + len;
                while (off < limit) {
                    int c = UTF16Util.charAt(buf, 0, buf.length, off);
                    off += UTF16Util.getCharCount(c);
                    if (PRINTABLES.indexOf(c) < 0
                            && TestUtil.escapeUnprintable(buffer, c)) {
                        super.write(buffer.toString());
                        buffer.setLength(0);
                    } else {
                        super.write(c);
                    }
                }
            }
        }

        public void write(String s, int off, int len) {
            write(s.substring(off, off + len).toCharArray(), 0, len);
        }
    }

    // filters
    // match against the entire hierarchy
    // A;B;!C;!D --> (A ||B) && (!C && !D)
    // positive, negative, unknown matches
    // positive -- known to be included, negative- known to be excluded
    // positive only if no excludes, and matches at least one include, if any
    // negative only if matches at least one exclude
    // otherwise, we wait

    public static class TestParams {
        public boolean prompt;
        public boolean nothrow;
        public boolean verbose;
        public boolean quiet;
        public int listlevel;
        public boolean describe;
        public boolean warnings;
        public boolean nodata;
        public long timing = 0;
        public boolean memusage;
        public int inclusion;
        public String filter;
        public long seed;
        public String tfilter; // for transliterator tests

        public State stack;

        public StringBuffer errorSummary;
        private StringBuffer timeLog;

        public PrintWriter log;
        public int indentLevel;
        private boolean needLineFeed;
        private boolean suppressIndent;
        public int errorCount;
        public int warnCount;
        public int invalidCount;
        public int testCount;
        private NumberFormat tformat;
        public Random random;
        public int maxTargetSec = 10;
        public HashMap props;

        private TestParams() {
        }

        public static TestParams create(String arglist, PrintWriter log) {
            String[] args = null;
            if (arglist != null && arglist.length() > 0) {
                args = arglist.split("\\s");
            }
            return create(args, log);
        }

        /**
         * Create a TestParams from a list of arguments.  If successful, return the params object,
         * else return null.  Error messages will be reported on errlog if it is not null.
         * Arguments and values understood by this method will be removed from the args array
         * and existing args will be shifted down, to be filled by nulls at the end.
         * @param args the list of arguments
         * @param log the error log, or null if no error log is desired
         * @return the new TestParams object, or null if error
         */
        public static TestParams create(String[] args, PrintWriter log) {
            TestParams params = new TestParams();

            if(log == null){
                params.log = new NullWriter();
            }else{
                params.log =  new ASCIIWriter(log, true);
            }

            boolean usageError = false;
            String filter = null;
            String fmt = "#,##0.000s";
            int wx = 0; // write argets.
            if (args != null) {
                for (int i = 0; i < args.length; i++) {
                    String arg = args[i];
                    if (arg == null || arg.length() == 0) {
                        continue;
                    }
                    if (arg.charAt(0) == '-') {
                        arg = arg.toLowerCase();
                        if (arg.equals("-verbose") || arg.equals("-v")) {
                            params.verbose = true;
                            params.quiet = false;
                        } else if (arg.equals("-quiet") || arg.equals("-q")) {
                            params.quiet = true;
                            params.verbose = false;
                        } else if (arg.equals("-help") || arg.equals("-h")) {
                            usageError = true;
                        } else if (arg.equals("-warning") || arg.equals("-w")) {
                            params.warnings = true;
                        } else if (arg.equals("-nodata") || arg.equals("-nd")) {
                            params.nodata = true;
                        } else if (arg.equals("-list") || arg.equals("-l")) {
                            params.listlevel = 1;
                        } else if (arg.equals("-listall") || arg.equals("-la")) {
                            params.listlevel = 2;
                        } else if (arg.equals("-listexaustive") || arg.equals("-le")) {
                            params.listlevel = 3;
                        } else if (arg.equals("-memory") || arg.equals("-m")) {
                            params.memusage = true;
                        } else if (arg.equals("-nothrow") || arg.equals("-n")) {
                            params.nothrow = true;
                            params.errorSummary = new StringBuffer();
                        } else if (arg.equals("-describe") || arg.equals("-d")) {
                            params.describe = true;
                        } else if (arg.startsWith("-r")) {
                            String s = null;
                            int n = arg.indexOf(':');
                            if (n != -1) {
                                s = arg.substring(n + 1);
                                arg = arg.substring(0, n);
                            }

                            if (arg.equals("-r") || arg.equals("-random")) {
                                if (s == null) {
                                    params.seed = System.currentTimeMillis();
                                } else {
                                    params.seed = Long.parseLong(s);
                                }
                            } else {
                                log.println("*** Error: unrecognized argument: " + arg);
                                usageError = true;
                                break;
                            }
                        } else if (arg.startsWith("-e")) {
                            // see above
                            params.inclusion = (arg.length() == 2)
                                ? 5
                                : Integer.parseInt(arg.substring(2));
                            if (params.inclusion < 0 || params.inclusion > 10) {
                                usageError = true;
                                break;
                            }
                        } else if (arg.startsWith("-tfilter:")) {
                            params.tfilter = arg.substring(8);
                        } else if (arg.startsWith("-time") || arg.startsWith("-t")) {
                            long val = 0;
                            int inx = arg.indexOf(':');
                            if (inx > 0) {
                                String num = arg.substring(inx + 1);
                                try {
                                    val = Long.parseLong(num);
                                } catch (Exception e) {
                                    log.println("*** Error: could not parse time threshold '"
                                                + num + "'");
                                    usageError = true;
                                    break;
                                }
                            }
                            params.timing = val;
                            if (val <= 10) {
                                fmt = "#,##0.000s";
                            } else if (val <= 100) {
                                fmt = "#,##0.00s";
                            } else if (val <= 1000) {
                                fmt = "#,##0.0s";
                            }
                        } else if (arg.startsWith("-filter:")) {
                            String temp = arg.substring(8).toLowerCase();
                            filter = filter == null ? temp : filter + "," + temp;
                        } else if (arg.startsWith("-f:")) {
                            String temp = arg.substring(3).toLowerCase();
                            filter = filter == null ? temp : filter + "," + temp;
                        } else if (arg.startsWith("-s")) {
                            params.log = new NullWriter();
                        } else if (arg.startsWith("-u")) {
                            if (params.log instanceof ASCIIWriter) {
                                params.log = log;
                            }
                        } else if (arg.startsWith("-prop:")) {
                            String temp = arg.substring(6);
                            int eql = temp.indexOf('=');
                            if (eql <= 0) {
                                log.println("*** Error: could not parse custom property '" + arg + "'");
                                usageError = true;
                                break;
                            }
                            if (params.props == null) {
                                params.props = new HashMap();
                            }
                            params.props.put(temp.substring(0, eql), temp.substring(eql+1));
                        } else {
                            log.println("*** Error: unrecognized argument: "
                                        + args[i]);
                            usageError = true;
                            break;
                        }
                    } else {
                        args[wx++] = arg; // shift down
                    }
                }

                while (wx < args.length) {
                    args[wx++] = null;
                }
            }

            params.tformat = new DecimalFormat(fmt);

            if (usageError) {
                usage(log, "TestAll");
                return null;
            }

            if (filter != null) {
                params.filter = filter.toLowerCase();
            }

            params.init();

            return params;
        }

        public String errorSummary() {
            return errorSummary == null ? "" : errorSummary.toString();
        }

        public void init() {
            indentLevel = 0;
            needLineFeed = false;
            suppressIndent = false;
            errorCount = 0;
            warnCount = 0;
            invalidCount = 0;
            testCount = 0;
            random = seed == 0 ? null : new Random(seed);
        }

        public class State {
            State link;
            String name;
            StringBuffer buffer;
            int level;
            int ec;
            int wc;
            int ic;
            int tc;
            boolean flushed;
            public boolean included;
            long mem;
            long millis;

            public State(State link, String name, boolean included) {
                this.link = link;
                this.name = name;
                if (link == null) {
                    this.level = 0;
                    this.included = included;
                } else {
                    this.level = link.level + 1;
                    this.included = included || link.included;
                }
                this.ec = errorCount;
                this.wc = warnCount;
                this.ic = invalidCount;
                this.tc = testCount;

                if (link == null || this.included) {
                    flush();
                }

                mem = getmem();
                millis = System.currentTimeMillis();
            }

            void flush() {
                if (!flushed) {
                    if (link != null) {
                        link.flush();
                    }

                    indent(level);
                    log.print(name);
                    log.flush();

                    flushed = true;

                    needLineFeed = true;
                }
            }

            void appendPath(StringBuffer buf) {
                if (this.link != null) {
                    this.link.appendPath(buf);
                    buf.append('/');
                }
                buf.append(name);
            }
        }

        public void push(String name, String description, boolean included) {
            if (inDocMode() && describe && description != null) {
                name += ": " + description;
            }
            stack = new State(stack, name, included);
        }

        public void pop() {
            if (stack != null) {
                writeTestResult();
                stack = stack.link;
            }
        }

        public boolean inDocMode() {
            return describe || listlevel != 0;
        }

        public boolean doMethods() {
            return !inDocMode() || listlevel == 3
                    || (indentLevel == 1 && listlevel > 0);
        }

        public boolean doRecurse() {
            return !inDocMode() || listlevel > 1
                    || (indentLevel == 1 && listlevel > 0);
        }

        public boolean doRecurseGroupsOnly() {
            return inDocMode()
                    && (listlevel == 2 || (indentLevel == 1 && listlevel > 0));
        }

        // return 0, -1, or 1
        // 1: run this test
        // 0: might run this test, no positive include or exclude on this group
        // -1: exclude this test
        public int filter(String testName) {
            int result = 0;
            if (filter == null) {
                result = 1;
            } else {
                boolean noIncludes = true;
                boolean noExcludes = filter.indexOf('^') == -1;
                testName = testName.toLowerCase();
                int ix = 0;
                while (ix < filter.length()) {
                    int nix = filter.indexOf(',', ix);
                    if (nix == -1) {
                        nix = filter.length();
                    }
                    if (filter.charAt(ix) == '^') {
                        if (testName.indexOf(filter.substring(ix + 1, nix)) != -1) {
                            result = -1;
                            break;
                        }
                    } else {
                        noIncludes = false;
                        if (testName.indexOf(filter.substring(ix, nix)) != -1) {
                            result = 1;
                            if (noExcludes) {
                                break;
                            }
                        }
                    }

                    ix = nix + 1;
                }
                if (result == 0 && noIncludes) {
                    result = 1;
                }
            }
            //              System.out.println("filter: " + testName + " returns: " +
            // result);
            return result;
        }

        /**
         * Log access.
         * @param msg The string message to write
         */
        public void write(String msg) {
            write(msg, false);
        }

        public void writeln(String msg) {
            write(msg, true);
        }

        private void write(String msg, boolean newln) {
            if (!suppressIndent) {
                if (needLineFeed) {
                    log.println();
                    needLineFeed = false;
                }
                log.print(spaces.substring(0, indentLevel * 2));
            }
            log.print(msg);
            if (newln) {
                log.println();
            }
            log.flush();
            suppressIndent = !newln;
        }

        private void msg(String message, int level, boolean incCount,
                boolean newln) {
            int oldLevel = level;
            if (level == WARN && (!warnings && !nodata)){
                level = ERR;
            }

            if (incCount) {
                if (level == WARN) {
                    warnCount++;
                    invalidCount++;
                } else if (level == ERR) {
                    errorCount++;
                }
            }

            // should roll indentation stuff into log ???
            if (verbose || level > (quiet ? WARN : LOG)) {
                if (!suppressIndent) {
                    indent(indentLevel + 1);
                    final String[] MSGNAMES = {"", "Warning: ", "Error: "};
                    log.print(MSGNAMES[oldLevel]);
                }

                log.print(message);
                if (newln) {
                    log.println();
                }
                log.flush();
            }

            if (level == ERR) {
                if (!nothrow) {
                    throw new RuntimeException(message);
                }
                if (!suppressIndent && errorSummary != null && stack !=null
                        && (errorCount == stack.ec + 1)) {
                    stack.appendPath(errorSummary);
                    errorSummary.append("\n");
                }
            }

            suppressIndent = !newln;
        }

        private void writeTestInvalid(String name, boolean nodataArg) {
            //              msg("***" + name + "*** not found or not valid.", WARN, true,
            // true);
            if (inDocMode()) {
                if (!warnings) {
                    if (stack != null) {
                        stack.flush();
                    }
                    log.println(" *** Target not found or not valid.");
                    log.flush();
                    needLineFeed = false;
                }
            } else {
                if(!nodataArg){
                    msg("Test " + name + " not found or not valid.", WARN, true,
                        true);
                }
            }
        }

        long getmem() {
            long newmem = 0;
            if (memusage) {
                Runtime rt = Runtime.getRuntime();
                long lastmem = Long.MAX_VALUE;
                do {
                    rt.gc();
                    rt.gc();
                    try {
                        Thread.sleep(50);
                    } catch (Exception e) {
                        break;
                    }
                    lastmem = newmem;
                    newmem = rt.totalMemory() - rt.freeMemory();
                } while (newmem < lastmem);
            }
            return newmem;
        }

        private void writeTestResult() {
            if (inDocMode()) {
                if (needLineFeed) {
                    log.println();
                    log.flush();
                }
                needLineFeed = false;
                return;
            }

            long dmem = getmem() - stack.mem;
            long dtime = System.currentTimeMillis() - stack.millis;

            int testDelta = testCount - stack.tc;
            if (testDelta == 0) {
                return;
            }

            int errorDelta = errorCount - stack.ec;
            int invalidDelta = invalidCount - stack.ic;

            stack.flush();

            if (!needLineFeed) {
                indent(indentLevel);
                log.print("}");
            }
            needLineFeed = false;

            if (memusage || dtime >= timing) {
                log.print(" (");
                if (memusage) {
                    log.print("dmem: " + dmem);
                }
                if (dtime >= timing) {
                    if (memusage) {
                        log.print(", ");
                    }
                    log.print(tformat.format(dtime / 1000f));
                }
                log.print(")");
            }

            if (errorDelta != 0) {
                log.println(" FAILED ("
                        + errorDelta
                        + " failures"
                        + ((invalidDelta != 0) ? ", " + invalidDelta
                                + " tests skipped)" : ")"));
            } else if (invalidDelta != 0) {
                log.println(" Qualified (" + invalidDelta + " tests skipped)");
            } else {
                log.println(" Passed");
            }
        }

        private final void indent(int distance) {
            boolean idm = inDocMode();
            if (needLineFeed) {
                if (idm) {
                    log.println();
                } else {
                    log.println(" {");
                }
                needLineFeed = false;
            }

            log.print(spaces.substring(0, distance * (idm ? 3 : 2)));

            if (idm) {
                log.print("-- ");
            }
        }
    }

    public String getTranslitTestFilter() {
        return params.tfilter;
    }

    /**
     * Return the target name for a test class. This is either the end of the
     * class name, or if the class declares a public static field
     * CLASS_TARGET_NAME, the value of that field.
     */
    private static String getClassTargetName(Class testClass) {
        String name = testClass.getName();
        try {
            Field f = testClass.getField("CLASS_TARGET_NAME");
            name = (String) f.get(null);
        } catch (IllegalAccessException e) {
            throw new IllegalStateException(
                    "static field CLASS_TARGET_NAME must be accessible");
        } catch (NoSuchFieldException e) {
            int n = Math.max(name.lastIndexOf('.'), name.lastIndexOf('$'));
            if (n != -1) {
                name = name.substring(n + 1);
            }
        }
        return name;
    }

    /**
     * Check the given array to see that all the strings in the expected array
     * are present.
     *
     * @param msg
     *            string message, for log output
     * @param array
     *            array of strings to check
     * @param expected
     *            array of strings we expect to see, or null
     * @return the length of 'array', or -1 on error
     */
    protected int checkArray(String msg, String array[], String expected[]) {
        int explen = (expected != null) ? expected.length : 0;
        if (!(explen >= 0 && explen < 31)) { // [sic] 31 not 32
            errln("Internal error");
            return -1;
        }
        int i = 0;
        StringBuffer buf = new StringBuffer();
        int seenMask = 0;
        for (; i < array.length; ++i) {
            String s = array[i];
            if (i != 0)
                buf.append(", ");
            buf.append(s);
            // check expected list
            for (int j = 0, bit = 1; j < explen; ++j, bit <<= 1) {
                if ((seenMask & bit) == 0) {
                    if (s.equals(expected[j])) {
                        seenMask |= bit;
                        logln("Ok: \"" + s + "\" seen");
                    }
                }
            }
        }
        logln(msg + " = [" + buf + "] (" + i + ")");
        // did we see all expected strings?
        if (((1 << explen) - 1) != seenMask) {
            for (int j = 0, bit = 1; j < expected.length; ++j, bit <<= 1) {
                if ((seenMask & bit) == 0) {
                    errln("\"" + expected[j] + "\" not seen");
                }
            }
        }
        return array.length;
    }

    /**
     * Check the given array to see that all the locales in the expected array
     * are present.
     *
     * @param msg
     *            string message, for log output
     * @param array
     *            array of locales to check
     * @param expected
     *            array of locales names we expect to see, or null
     * @return the length of 'array'
     */
    protected int checkArray(String msg, Locale array[], String expected[]) {
        String strs[] = new String[array.length];
        for (int i = 0; i < array.length; ++i)
            strs[i] = array[i].toString();
        return checkArray(msg, strs, expected);
    }

    /**
     * Check the given array to see that all the locales in the expected array
     * are present.
     *
     * @param msg
     *            string message, for log output
     * @param array
     *            array of locales to check
     * @param expected
     *            array of locales names we expect to see, or null
     * @return the length of 'array'
     */
    protected int checkArray(String msg, ULocale array[], String expected[]) {
        String strs[] = new String[array.length];
        for (int i = 0; i < array.length; ++i)
            strs[i] = array[i].toString();
        return checkArray(msg, strs, expected);
    }

    // JUnit-like assertions.

    protected boolean assertTrue(String message, boolean condition) {
        return handleAssert(condition, message, "true", null);
    }

    protected boolean assertFalse(String message, boolean condition) {
        return handleAssert(!condition, message, "false", null);
    }

    protected boolean assertEquals(String message, boolean expected,
            boolean actual) {
        return handleAssert(expected == actual, message, String
                .valueOf(expected), String.valueOf(actual));
    }

    protected boolean assertEquals(String message, long expected, long actual) {
        return handleAssert(expected == actual, message, String
                .valueOf(expected), String.valueOf(actual));
    }

    // do NaN and range calculations to precision of float, don't rely on
    // promotion to double
    protected boolean assertEquals(String message, float expected,
            float actual, double error) {
        boolean result = Float.isInfinite(expected)
                ? expected == actual
                : !(Math.abs(expected - actual) > error); // handles NaN
        return handleAssert(result, message, String.valueOf(expected)
                + (error == 0 ? "" : " (within " + error + ")"), String
                .valueOf(actual));
    }

    protected boolean assertEquals(String message, double expected,
            double actual, double error) {
        boolean result = Double.isInfinite(expected)
                ? expected == actual
                : !(Math.abs(expected - actual) > error); // handles NaN
        return handleAssert(result, message, String.valueOf(expected)
                + (error == 0 ? "" : " (within " + error + ")"), String
                .valueOf(actual));
    }

    protected <T> boolean assertEquals(String message, T[] expected, T[] actual) {
        // Use toString on a List to get useful, readable messages
        String expectedString = expected == null ? "null" : Arrays.asList(expected).toString();
        String actualString = actual == null ? "null" : Arrays.asList(actual).toString();
        return assertEquals(message, expectedString, actualString);
    }
    
    protected boolean assertEquals(String message, Object expected,
            Object actual) {
        boolean result = expected == null ? actual == null : expected
                .equals(actual);
        return handleAssert(result, message, stringFor(expected),
                stringFor(actual));
    }

    protected boolean assertNotEquals(String message, Object expected,
            Object actual) {
        boolean result = !(expected == null ? actual == null : expected
                .equals(actual));
        return handleAssert(result, message, stringFor(expected),
                stringFor(actual), "not equal to", true);
    }

    protected boolean assertSame(String message, Object expected, Object actual) {
        return handleAssert(expected == actual, message, stringFor(expected),
                stringFor(actual), "==", false);
    }

    protected boolean assertNotSame(String message, Object expected,
            Object actual) {
        return handleAssert(expected != actual, message, stringFor(expected),
                stringFor(actual), "!=", true);
    }

    protected boolean assertNull(String message, Object actual) {
        return handleAssert(actual == null, message, null, stringFor(actual));
    }

    protected boolean assertNotNull(String message, Object actual) {
        return handleAssert(actual != null, message, null, stringFor(actual),
                "!=", true);
    }

    protected void fail(String message) {
        errln(message);
    }

    private boolean handleAssert(boolean result, String message,
            String expected, String actual) {
        return handleAssert(result, message, expected, actual, null, false);
    }

    public boolean handleAssert(boolean result, String message,
            Object expected, Object actual, String relation, boolean flip) {
        if (!result || isVerbose()) {
            String testLocation = sourceLocation();
            if (message == null) {
                message = "";
            }
            if (!message.equals("")) {
                message = ": " + message;
            }
            relation = relation == null ? ", got " : " " + relation + " ";
            if (result) {
                logln("OK " + testLocation + message + ": "
                        + (flip ? expected + relation + actual : expected));
            } else {
                // assert must assume errors are true errors and not just warnings
                // so cannot warnln here
                errln(testLocation + message
                        + ": expected"
                        + (flip ? relation + expected : " " + expected
                                + (actual != null ? relation + actual : "")));
            }
        }
        return result;
    }

    private final String stringFor(Object obj) {
        if (obj == null) {
            return "null";
        }
        if (obj instanceof String) {
            return "\"" + obj + '"';
        }
        return obj.getClass().getName() + "<" + obj + ">";
    }

    // Return the source code location of the caller located callDepth frames up the stack.
    private String sourceLocation() {
        // Walk up the stack to the first call site outside this file
        StackTraceElement[] st = new Throwable().getStackTrace();
        for (int i = 0; i < st.length; ++i) {
            if (!"TestFmwk.java".equals(st[i].getFileName())) {
                return "File "   + st[i].getFileName() + ", Line " + st[i].getLineNumber();
            }
        }
        throw new InternalError();
    }


    // End JUnit-like assertions

    // PrintWriter support

    public PrintWriter getErrorLogPrintWriter() {
        return new PrintWriter(new TestLogWriter(this, TestLog.ERR));
    }

    public PrintWriter getLogPrintWriter() {
        return new PrintWriter(new TestLogWriter(this, TestLog.LOG));
    }

    // end PrintWriter support

    protected TestParams params = null;

    private final static String spaces = "                                          ";

}