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difflib_test: add more tests

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This commit is contained in:
Patrick Mezard
2013-11-23 18:06:15 +01:00
parent 3859285434
commit 35c8dc471b
1 changed files with 52 additions and 26 deletions
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78
difflib/difflib_test.go
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@@ -9,6 +9,18 @@ import (
"testing"
)
func assertAlmostEqual(t *testing.T, a, b float64, places int) {
if math.Abs(a-b) > math.Pow10(-places) {
t.Errorf("%.7f != %.7f", a, b)
}
}
func assertEqual(t *testing.T, a, b interface{}) {
if !reflect.DeepEqual(a, b) {
t.Errorf("%v != %v", a, b)
}
}
func splitChars(s string) []string {
chars := make([]string, 0, len(s))
// Assume ASCII inputs
@@ -20,20 +32,9 @@ func splitChars(s string) []string {
func TestSequenceMatcherRatio(t *testing.T) {
s := NewMatcher(splitChars("abcd"), splitChars("bcde"))
ratio := s.Ratio()
if ratio != 0.75 {
t.Errorf("unexpected ratio: %v", ratio)
}
ratio = s.QuickRatio()
if ratio != 0.75 {
t.Errorf("unexpected quick ratio: %v", ratio)
}
ratio = s.RealQuickRatio()
if ratio != 1.0 {
t.Errorf("unexpected real quick ratio: %v", ratio)
}
assertEqual(t, s.Ratio(), 0.75)
assertEqual(t, s.QuickRatio(), 0.75)
assertEqual(t, s.RealQuickRatio(), 1.0)
}
func TestGetOptCodes(t *testing.T) {
@@ -147,18 +148,6 @@ four`
}
}
func assertAlmostEqual(t *testing.T, a, b float64, places int) {
if math.Abs(a-b) > math.Pow10(-places) {
t.Errorf("%.7f != %.7f", a, b)
}
}
func assertEqual(t *testing.T, a, b interface{}) {
if !reflect.DeepEqual(a, b) {
t.Errorf("%v != %v", a, b)
}
}
func rep(s string, count int) string {
return strings.Repeat(s, count)
}
@@ -206,3 +195,40 @@ func TestWithAsciiBJunk(t *testing.T) {
splitChars(rep("a", 44)+rep("b", 40)+rep(" ", 20)), false, isJunk)
assertEqual(t, sm.bJunk, map[string]struct{}{" ": struct{}{}, "b": struct{}{}})
}
func TestSFBugsRatioForNullSeqn(t *testing.T) {
sm := NewMatcher(nil, nil)
assertEqual(t, sm.Ratio(), 1.0)
assertEqual(t, sm.QuickRatio(), 1.0)
assertEqual(t, sm.RealQuickRatio(), 1.0)
}
func TestSFBugsComparingEmptyLists(t *testing.T) {
groups := NewMatcher(nil, nil).GetGroupedOpCodes(-1)
assertEqual(t, len(groups), 0)
diff := UnifiedDiff{
FromFile: "Original",
ToFile: "Current",
Context: 3,
}
result, err := GetUnifiedDiffString(diff)
assertEqual(t, err, nil)
assertEqual(t, result, "")
}
func TestOutputFormatRangeFormatUnified(t *testing.T) {
// Per the diff spec at http://www.unix.org/single_unix_specification/
//
// Each <range> field shall be of the form:
// %1d", <beginning line number> if the range contains exactly one line,
// and:
// "%1d,%1d", <beginning line number>, <number of lines> otherwise.
// If a range is empty, its beginning line number shall be the number of
// the line just before the range, or 0 if the empty range starts the file.
fm := formatRangeUnified
assertEqual(t, fm(3, 3), "3,0")
assertEqual(t, fm(3, 4), "4")
assertEqual(t, fm(3, 5), "4,2")
assertEqual(t, fm(3, 6), "4,3")
assertEqual(t, fm(0, 0), "0,0")
}