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-rw-r--r--src/encoding/json/fold_test.go110
1 files changed, 110 insertions, 0 deletions
diff --git a/src/encoding/json/fold_test.go b/src/encoding/json/fold_test.go
new file mode 100644
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--- /dev/null
+++ b/src/encoding/json/fold_test.go
@@ -0,0 +1,110 @@
+// Copyright 2013 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 json
+
+import (
+ "bytes"
+ "strings"
+ "testing"
+ "unicode/utf8"
+)
+
+var foldTests = []struct {
+ fn func(s, t []byte) bool
+ s, t string
+ want bool
+}{
+ {equalFoldRight, "", "", true},
+ {equalFoldRight, "a", "a", true},
+ {equalFoldRight, "", "a", false},
+ {equalFoldRight, "a", "", false},
+ {equalFoldRight, "a", "A", true},
+ {equalFoldRight, "AB", "ab", true},
+ {equalFoldRight, "AB", "ac", false},
+ {equalFoldRight, "sbkKc", "ſbKKc", true},
+ {equalFoldRight, "SbKkc", "ſbKKc", true},
+ {equalFoldRight, "SbKkc", "ſbKK", false},
+ {equalFoldRight, "e", "é", false},
+ {equalFoldRight, "s", "S", true},
+
+ {simpleLetterEqualFold, "", "", true},
+ {simpleLetterEqualFold, "abc", "abc", true},
+ {simpleLetterEqualFold, "abc", "ABC", true},
+ {simpleLetterEqualFold, "abc", "ABCD", false},
+ {simpleLetterEqualFold, "abc", "xxx", false},
+
+ {asciiEqualFold, "a_B", "A_b", true},
+ {asciiEqualFold, "aa@", "aa`", false}, // verify 0x40 and 0x60 aren't case-equivalent
+}
+
+func TestFold(t *testing.T) {
+ for i, tt := range foldTests {
+ if got := tt.fn([]byte(tt.s), []byte(tt.t)); got != tt.want {
+ t.Errorf("%d. %q, %q = %v; want %v", i, tt.s, tt.t, got, tt.want)
+ }
+ truth := strings.EqualFold(tt.s, tt.t)
+ if truth != tt.want {
+ t.Errorf("strings.EqualFold doesn't agree with case %d", i)
+ }
+ }
+}
+
+func TestFoldAgainstUnicode(t *testing.T) {
+ var buf1, buf2 []byte
+ var runes []rune
+ for i := 0x20; i <= 0x7f; i++ {
+ runes = append(runes, rune(i))
+ }
+ runes = append(runes, kelvin, smallLongEss)
+
+ funcs := []struct {
+ name string
+ fold func(s, t []byte) bool
+ letter bool // must be ASCII letter
+ simple bool // must be simple ASCII letter (not 'S' or 'K')
+ }{
+ {
+ name: "equalFoldRight",
+ fold: equalFoldRight,
+ },
+ {
+ name: "asciiEqualFold",
+ fold: asciiEqualFold,
+ simple: true,
+ },
+ {
+ name: "simpleLetterEqualFold",
+ fold: simpleLetterEqualFold,
+ simple: true,
+ letter: true,
+ },
+ }
+
+ for _, ff := range funcs {
+ for _, r := range runes {
+ if r >= utf8.RuneSelf {
+ continue
+ }
+ if ff.letter && !isASCIILetter(byte(r)) {
+ continue
+ }
+ if ff.simple && (r == 's' || r == 'S' || r == 'k' || r == 'K') {
+ continue
+ }
+ for _, r2 := range runes {
+ buf1 = append(utf8.AppendRune(append(buf1[:0], 'x'), r), 'x')
+ buf2 = append(utf8.AppendRune(append(buf2[:0], 'x'), r2), 'x')
+ want := bytes.EqualFold(buf1, buf2)
+ if got := ff.fold(buf1, buf2); got != want {
+ t.Errorf("%s(%q, %q) = %v; want %v", ff.name, buf1, buf2, got, want)
+ }
+ }
+ }
+ }
+}
+
+func isASCIILetter(b byte) bool {
+ return ('A' <= b && b <= 'Z') || ('a' <= b && b <= 'z')
+}