go/src/lib/strings_test.go

// 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 strings

import (
	"strings";
	"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;
}

var abcd = "abcd";
var faces = "☺☻☹";
var commas = "1,2,3,4";
var dots = "1....2....3....4";

type ExplodeTest struct {
	s string;
	a []string;
}
var explodetests = []ExplodeTest (
	ExplodeTest( abcd,	[]string("a", "b", "c", "d") ),
	ExplodeTest( faces,	[]string("☺", "☻", "☹" ) ),
)
func TestExplode(t *testing.T) {
	for i := 0; i < len(explodetests); i++ {
		tt := explodetests[i];
		a := Explode(tt.s);
		if !eq(a, tt.a) {
			t.Errorf("Explode(%q) = %v; want %v", tt.s, a, tt.a);
			continue;
		}
		s := Join(a, "");
		if s != tt.s {
			t.Errorf(`Join(Explode(%q), "") = %q`, tt.s, s);
		}
	}
}

type SplitTest struct {
	s string;
	sep string;
	a []string;
}
var splittests = []SplitTest (
	SplitTest( abcd,	"a",	[]string("", "bcd") ),
	SplitTest( abcd,	"z",	[]string("abcd") ),
	SplitTest( abcd,	"",	[]string("a", "b", "c", "d") ),
	SplitTest( commas,	",",	[]string("1", "2", "3", "4") ),
	SplitTest( dots,	"...",	[]string("1", ".2", ".3", ".4") ),
	SplitTest( faces,	"☹",	[]string("☺☻", "") ),
	SplitTest( faces,	"~",	[]string(faces) ),
	SplitTest( faces,	"",	[]string("☺", "☻", "☹") ),
)
func TestSplit(t *testing.T) {
	for i := 0; i < len(splittests); i++ {
		tt := splittests[i];
		a := Split(tt.s, tt.sep);
		if !eq(a, tt.a) {
			t.Errorf("Split(%q, %q) = %v; want %v", tt.s, tt.sep, a, tt.a);
			continue;
		}
		s := Join(a, tt.sep);
		if s != tt.s {
			t.Errorf("Join(Split(%q, %q), %q) = %q", tt.s, tt.sep, tt.sep, s);
		}
	}
}