/
bytes_test.go
165 lines (151 loc) · 3.99 KB
/
bytes_test.go
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// 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 bytes
import (
"bytes";
"io";
"testing";
)
func eq(a, b []string) bool {
if len(a) != len(b) {
return false;
}
for i := 0; i < len(a); i++ {
if a[i] != b[i] {
return false;
}
}
return true;
}
func arrayOfString(a [][]byte) []string {
result := make([]string, len(a));
for j := 0; j < len(a); j++ {
result[j] = string(a[j])
}
return result
}
// For ease of reading, the test cases use strings that are converted to byte
// arrays before invoking the functions.
var abcd = "abcd"
var faces = "☺☻☹"
var commas = "1,2,3,4"
var dots = "1....2....3....4"
type CompareTest struct {
a string;
b string;
cmp int;
}
var comparetests = []CompareTest {
CompareTest{ "", "", 0 },
CompareTest{ "a", "", 1 },
CompareTest{ "", "a", -1 },
CompareTest{ "abc", "abc", 0 },
CompareTest{ "ab", "abc", -1 },
CompareTest{ "abc", "ab", 1 },
CompareTest{ "x", "ab", 1 },
CompareTest{ "ab", "x", -1 },
CompareTest{ "x", "a", 1 },
CompareTest{ "b", "x", -1 },
}
func TestCompare(t *testing.T) {
for i := 0; i < len(comparetests); i++ {
tt := comparetests[i];
a := io.StringBytes(tt.a);
b := io.StringBytes(tt.b);
cmp := Compare(a, b);
eql := Equal(a, b);
if cmp != tt.cmp {
t.Errorf(`Compare(%q, %q) = %v`, tt.a, tt.b, cmp);
}
if eql != (tt.cmp==0) {
t.Errorf(`Equal(%q, %q) = %v`, tt.a, tt.b, eql);
}
}
}
type ExplodeTest struct {
s string;
n int;
a []string;
}
var explodetests = []ExplodeTest {
ExplodeTest{ abcd, 0, []string{"a", "b", "c", "d"} },
ExplodeTest{ faces, 0, []string{"☺", "☻", "☹"} },
ExplodeTest{ abcd, 2, []string{"a", "bcd"} },
}
func TestExplode(t *testing.T) {
for _, tt := range(explodetests) {
a := explode(io.StringBytes(tt.s), tt.n);
result := arrayOfString(a);
if !eq(result, tt.a) {
t.Errorf(`Explode("%s", %d) = %v; want %v`, tt.s, tt.n, result, tt.a);
continue;
}
s := Join(a, []byte{});
if string(s) != tt.s {
t.Errorf(`Join(Explode("%s", %d), "") = "%s"`, tt.s, tt.n, s);
}
}
}
type SplitTest struct {
s string;
sep string;
n int;
a []string;
}
var splittests = []SplitTest {
SplitTest{ abcd, "a", 0, []string{"", "bcd"} },
SplitTest{ abcd, "z", 0, []string{"abcd"} },
SplitTest{ abcd, "", 0, []string{"a", "b", "c", "d"} },
SplitTest{ commas, ",", 0, []string{"1", "2", "3", "4"} },
SplitTest{ dots, "...", 0, []string{"1", ".2", ".3", ".4"} },
SplitTest{ faces, "☹", 0, []string{"☺☻", ""} },
SplitTest{ faces, "~", 0, []string{faces} },
SplitTest{ faces, "", 0, []string{"☺", "☻", "☹"} },
SplitTest{ "1 2 3 4", " ", 3, []string{"1", "2", "3 4"} },
SplitTest{ "1 2 3", " ", 3, []string{"1", "2", "3"} },
SplitTest{ "1 2", " ", 3, []string{"1", "2"} },
SplitTest{ "123", "", 2, []string{"1", "23"} },
SplitTest{ "123", "", 17, []string{"1", "2", "3"} },
}
func TestSplit(t *testing.T) {
for _, tt := range splittests {
a := Split(io.StringBytes(tt.s), io.StringBytes(tt.sep), tt.n);
result := arrayOfString(a);
if !eq(result, tt.a) {
t.Errorf(`Split(%q, %q, %d) = %v; want %v`, tt.s, tt.sep, tt.n, result, tt.a);
continue;
}
s := Join(a, io.StringBytes(tt.sep));
if string(s) != tt.s {
t.Errorf(`Join(Split(%q, %q, %d), %q) = %q`, tt.s, tt.sep, tt.n, tt.sep, s);
}
}
}
type CopyTest struct {
a string;
b string;
n int;
res string;
}
var copytests = []CopyTest {
CopyTest{ "", "", 0, "" },
CopyTest{ "a", "", 0, "a" },
CopyTest{ "a", "a", 1, "a" },
CopyTest{ "a", "b", 1, "b" },
CopyTest{ "xyz", "abc", 3, "abc" },
CopyTest{ "wxyz", "abc", 3, "abcz" },
CopyTest{ "xyz", "abcd", 3, "abc" },
}
func TestCopy(t *testing.T) {
for i := 0; i < len(copytests); i++ {
tt := copytests[i];
dst := io.StringBytes(tt.a);
n := Copy(dst, io.StringBytes(tt.b));
result := string(dst);
if result != tt.res || n != tt.n {
t.Errorf(`Copy(%q, %q) = %d, %q; want %d, %q`, tt.a, tt.b, n, result, tt.n, tt.res);
continue;
}
}
}