go - 这些看似相同的Golang结构为何不相等？

Question

我正在尝试学习Golang测试。

我正在比较2个看似相同的结构，但它们并不相等。怎么了？

2020/01/22 17:10:10 ****2 cities[0] is type *main.City has &main.City{Name:"Boston", State:"", Country:"USA", Capital:true, Population:685000} 
2020/01/22 17:10:10 ****2 expected  is type *main.City has &main.City{Name:"Boston", State:"", Country:"USA", Capital:true, Population:685000} 
2020/01/22 17:10:11 Preparing to DELETE 5 city docs
--- FAIL: TestCities (3.08s)
    --- FAIL: TestCities/Test_POST_should_add_New_City (0.62s)
        city_handlers_test.go:68: Why is ( cities[0] != expected )Boston was not added to Firestore: 
             got &{Boston  USA true 685000}  
             want &{Boston  USA true 685000}
FAIL
exit status 1

这是测试:

        // why don't these structs match?
        log.Printf("****2 cities[0] is type %T has %#v \n", cities[0], cities[0])
        log.Printf("****2 expected  is type %T has %#v \n", expected, expected)
        // why is this comparison failing when both are the same type with the same values?
        if cities[0] != expected {
            t.Errorf("Why is ( cities[0] != expected )Boston was not added to Firestore: \n got %v  \n want %v", cities[0], expected)
        }

Answer 1

您比较指针，看起来它们指向不同的对象。为了进行正确的检查，您应该比较对象的字段。

该软件包可以帮助您做到这一点:reflect.DeepEqual()，testify.EqualValues()，cmp.Equal()

例:
https://play.golang.org/p/09BYFeYj5xx