如何在测试用例中修复 "missing type in composite literal"

Question

我正在尝试为函数 ReadField() 编写测试代码，但我在定义测试用例时遇到困难。

报错"missing type in composite literal"。我相信这只是一些语法错误。

我试过在函数体外部定义结构体，但仍然会出现同样的错误。

ReadField(string, string, bool) (bool, string)


func TestReadField(t *testing.T){

    testCases := []struct {
        Name    string
        Input   struct{ 
            FirstString     string 
            SecondString    string 
            SomeBool        bool
        }
        Expected struct{
            IsValid bool
            Message string
        }
    }{
        //This is where the error points to.

        //Valid 
        {"Test Case 1",

        //Missing type error 
        {"FirstString", "SecondString", true},

        //Missing type error 
        {true, "testMessage"},},

        //Same goes for the remaining

        {"Test Case 2", 
        {"FirstString", "SecondString", false},
        {true, "testMessage"},},

        {"Test Case 3", 
        {"FirstString", "SecondString", true},
        {false, "testMessage"},},
    }

    for _, testCase := range testCases{
        t.Run(testCase.Name, func(t *testing.T){
            isValid, message := ReadField(testCase.Input.FirstString, testCase.Input.SecondString, testCase.Input.SomeBool)
            if isValid != testCase.Expected.IsValid || message != testCase.Expected.Message {
                t.Errorf("Expected: %b, %b \n Got: %b, %b", testCase.Expected.IsValid, testCase.Expected.Message, isValid, message)
            } else {
                t.Logf("Expected: %b, %b \n Got: %b, %b", testCase.Expected.IsValid, testCase.Expected.Message, isValid, message)
            }
        })  
    }
}

Answer 1

如错误所示，您需要在声明中包含该类型。由于您使用的是匿名类型，这意味着您必须重复类型定义。这当然非常烦人：

    //Valid 
    {"Test Case 1",

    //Missing type error 
    struct{ 
        FirstString     string 
        SecondString    string 
        SomeBool        bool
    }{"FirstString", "SecondString", true},

   // etc ...

所以你应该做的是使用命名类型：

type testInput struct{ 
    FirstString     string 
    SecondString    string 
    SomeBool        bool
}
type expected struct{
    IsValid bool
    Message string
}
testCases := []struct {
    Name     string
    Input    testInput
    Expected expected
}{
    //Valid 
    {"Test Case 1",

    //Missing type error 
    testInput{"FirstString", "SecondString", true},

    // etc ...

或者（我的偏好），展平你的顶级结构，让一切都更具可读性：

testCases := []struct {
    Name              string
    InputFirstString  string 
    InputSecondString string 
    InputSomeBool     bool
    IsValid           bool
    Message           string
}{
    //Valid 
    {"Test Case 1",
    "FirstString",
    "SecondString",
    true,
 // etc...

我也强烈鼓励您在定义中使用字段标签，以提高可读性：

    //Valid 
    {
        Name:              "Test Case 1",
        InputFirstSTring:  "FirstString",
        InputSecondString: "SecondString",
        InputSomeBool:      true,
 // etc...

如何在测试用例中修复 "missing type in composite literal"

How to fix "missing type in composite literal" in test cases

struct

unit-testing

go

composite-literals