testify/assert.Contains 如何与地图一起使用？

Question

该文档显示此作为一个例子：assert.Contains(t, {"Hello": "World"}, "Hello", "But {'Hello': 'World'} does contain 'Hello'")但是运行这个失败mymap := map[string]string{}mymap["Hello"] = "World"assert.Contains(t, mymap, "Hello")导致错误：Error:     "map[Hello:World]" could not be applied builtin len()切换 mymap 和 "hello" 结果如下：Error:     "Hello" does not contain "map[Hello:World]"

Answer 1

我检查了一下，它对我来说很好用。您确定显示的错误与该代码有关吗？这就是我尝试过的：

package main

import "testing"

import "github.com/stretchr/testify/assert"

func TestContains(t *testing.T) {

    mymap := map[string]string{}

    mymap["Hello"] = "World"

    assert.Contains(t, mymap, "Hello")

}

并且测试不会失败：

→ go test stackoverflow/35387510/contains_test.go

ok      command-line-arguments  0.009s

Answer 2

看起来您必须使用类型断言

package main

import "testing"

import "github.com/stretchr/testify/assert"

func TestContains(t *testing.T) {

     // Initialize assert as below

    assert := assert.New(t)

    mymap := map[string]string{}

    mymap["Hello"] = "World"

    //then no need to pass t in contains

    assert.Contains(mymap, "Hello")

}

在包含类型断言的文档中