blob: bc68f8e65420d68e5394328b958d851a5f24bb86 [file] [log] [blame]
package calc
import (
"math"
"testing"
"github.com/stretchr/testify/assert"
"go.skia.org/infra/perf/go/types"
)
func TestStdDevFuncImpl_WellKnownStdDeviations_Success(t *testing.T) {
// Via the example on https://en.wikipedia.org/wiki/Standard_deviation we
// know that {2, 4, 4, 4, 5, 5, 7, 9} has a stddev of 2.
//
// Values that don't ever change, ala {2,2,2,..} will have stddev of 0.
tr := StdDevFuncImpl(types.TraceSet{
"a": []float32{e, 2, 1, 2},
"b": []float32{e, 4, 1, 2},
"c": []float32{e, 4, 1, 2},
"d": []float32{e, 4, 1, 2},
"e": []float32{e, 5, 1, 2},
"f": []float32{e, 5, 1, 2},
"g": []float32{e, 7, 1, 2},
"h": []float32{e, 9, 1, 2},
})
assert.Equal(t, types.Trace{e, 2, 0, 0}, tr)
}
func TestStdDevFuncImpl_EmptyTraceSet_ReturnsEmptyTrace(t *testing.T) {
assert.Equal(t, types.Trace{}, StdDevFuncImpl(types.TraceSet{}))
}
func TestMaxFuncImpl(t *testing.T) {
tr := MaxFuncImpl(types.TraceSet{
"a": []float32{e, 0, 1, 2},
"b": []float32{e, e, 1, 3},
})
assert.Equal(t, types.Trace{-math.MaxFloat32, 0, 1, 3}, tr)
}
func TestMaxFuncImpl_EmptyTraceSet_ReturnsEmptyTrace(t *testing.T) {
assert.Equal(t, types.Trace{}, MaxFuncImpl(types.TraceSet{}))
}
func TestMinFuncImpl(t *testing.T) {
tr := MinFuncImpl(types.TraceSet{
"a": []float32{e, 0, 1, 2},
"b": []float32{e, e, 1, 3},
})
assert.Equal(t, types.Trace{math.MaxFloat32, 0, 1, 2}, tr)
}
func TestMinFuncImpl_EmptyTraceSet_ReturnsEmptyTrace(t *testing.T) {
assert.Equal(t, types.Trace{}, MinFuncImpl(types.TraceSet{}))
}