diff options
Diffstat (limited to 'libgo/go/exp/utf8string/string_test.go')
-rw-r--r-- | libgo/go/exp/utf8string/string_test.go | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/libgo/go/exp/utf8string/string_test.go b/libgo/go/exp/utf8string/string_test.go new file mode 100644 index 0000000..28511b2 --- /dev/null +++ b/libgo/go/exp/utf8string/string_test.go @@ -0,0 +1,123 @@ +// Copyright 2009 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package utf8string + +import ( + "math/rand" + "testing" + "unicode/utf8" +) + +var testStrings = []string{ + "", + "abcd", + "☺☻☹", + "日a本b語ç日ð本Ê語þ日¥本¼語i日©", + "日a本b語ç日ð本Ê語þ日¥本¼語i日©日a本b語ç日ð本Ê語þ日¥本¼語i日©日a本b語ç日ð本Ê語þ日¥本¼語i日©", + "\x80\x80\x80\x80", +} + +func TestScanForwards(t *testing.T) { + for _, s := range testStrings { + runes := []rune(s) + str := NewString(s) + if str.RuneCount() != len(runes) { + t.Errorf("%s: expected %d runes; got %d", s, len(runes), str.RuneCount()) + break + } + for i, expect := range runes { + got := str.At(i) + if got != expect { + t.Errorf("%s[%d]: expected %c (%U); got %c (%U)", s, i, expect, expect, got, got) + } + } + } +} + +func TestScanBackwards(t *testing.T) { + for _, s := range testStrings { + runes := []rune(s) + str := NewString(s) + if str.RuneCount() != len(runes) { + t.Errorf("%s: expected %d runes; got %d", s, len(runes), str.RuneCount()) + break + } + for i := len(runes) - 1; i >= 0; i-- { + expect := runes[i] + got := str.At(i) + if got != expect { + t.Errorf("%s[%d]: expected %c (%U); got %c (%U)", s, i, expect, expect, got, got) + } + } + } +} + +func randCount() int { + if testing.Short() { + return 100 + } + return 100000 +} + +func TestRandomAccess(t *testing.T) { + for _, s := range testStrings { + if len(s) == 0 { + continue + } + runes := []rune(s) + str := NewString(s) + if str.RuneCount() != len(runes) { + t.Errorf("%s: expected %d runes; got %d", s, len(runes), str.RuneCount()) + break + } + for j := 0; j < randCount(); j++ { + i := rand.Intn(len(runes)) + expect := runes[i] + got := str.At(i) + if got != expect { + t.Errorf("%s[%d]: expected %c (%U); got %c (%U)", s, i, expect, expect, got, got) + } + } + } +} + +func TestRandomSliceAccess(t *testing.T) { + for _, s := range testStrings { + if len(s) == 0 || s[0] == '\x80' { // the bad-UTF-8 string fools this simple test + continue + } + runes := []rune(s) + str := NewString(s) + if str.RuneCount() != len(runes) { + t.Errorf("%s: expected %d runes; got %d", s, len(runes), str.RuneCount()) + break + } + for k := 0; k < randCount(); k++ { + i := rand.Intn(len(runes)) + j := rand.Intn(len(runes) + 1) + if i > j { // include empty strings + continue + } + expect := string(runes[i:j]) + got := str.Slice(i, j) + if got != expect { + t.Errorf("%s[%d:%d]: expected %q got %q", s, i, j, expect, got) + } + } + } +} + +func TestLimitSliceAccess(t *testing.T) { + for _, s := range testStrings { + str := NewString(s) + if str.Slice(0, 0) != "" { + t.Error("failure with empty slice at beginning") + } + nr := utf8.RuneCountInString(s) + if str.Slice(nr, nr) != "" { + t.Error("failure with empty slice at end") + } + } +} |