func TestEqualWhat(t *testing.T) {
    testMarshalUnmarshal(t,map[string]interface{}{"a":"b"})
    testMarshalUnmarshal(t,map[string]interface{}{"a":5})
}

testMarshalUnmarshal帮助器只是对json进行编组并返回：

func testMarshalUnmarshal(t *testing.T,in map[string]interface{}) {
    //marshal the object to a string
    jsb,err := json.Marshal(in);
    if err != nil {
        log.Printf("Unable to marshal msg")
        t.FailNow()
    }

    //unmarshal to a map
    res := make(map[string]interface{})
    if err := json.Unmarshal(jsb,&res); err != nil { t.FailNow() }

    if !reflect.DeepEqual(in,res) {
        log.Printf("\nExpected %#v\nbut got  %#v",in,res)
        t.FailNow()
    }
}

为什么第一个测试用例通过而第二个测试用例失败？测试的输出是这样的：

Expected map[string]interface {}{"a":5}
but got  map[string]interface {}{"a":5}
--- FAIL: TestEqualWhat (0.00 seconds)

Here is similar code on the go playground所以你可以轻松搞定它.