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// file_name: strings_test.go (这里样例代码放入strings_test.go文件中)
// 文件名需要以 _test 结尾
package strings_test

import (
    "strings"
    "testing"
)

// 函数名以Test开头，参数为test.T。如果是benchmark用例，则函数名以Benchmark开头
func TestIndex(t *testing.T) {
    const s, sep, want = "chicken", "ken", 4
    got := strings.Index(s, sep)
    if got != want {
        t.Errorf("Index(%q,%q) = %v; want %v", s, sep, got, want)
    }
}