Moved here from BIG5-HKSCS.IRREVERSIBLE.TXT.
diff --git a/tests/BIG5-HKSCS-1999.IRREVERSIBLE.TXT b/tests/BIG5-HKSCS-1999.IRREVERSIBLE.TXT
new file mode 100644
index 0000000..7a3aad9
--- /dev/null
+++ b/tests/BIG5-HKSCS-1999.IRREVERSIBLE.TXT
@@ -0,0 +1,10 @@
+0x8BF8	0x9F9C
+0x957A	0x8728
+0xF9E9	0x255E
+0xF9EA	0x256A
+0xF9EB	0x2561
+0xF9F9	0x2550
+0xF9FA	0x256D
+0xF9FB	0x256E
+0xF9FC	0x2570
+0xF9FD	0x256F