c# - 将自定义类型用于参数化 MSTest

Question

我正在创建单元测试，我想使用自定义类型(如 dto)创建参数化测试。

我想做这样的事情:

[TestMethod]
[DataRow(new StudentDto { FirstName = "Leo", Age = 22 })]
[DataRow(new StudentDto { FirstName = "John" })]
public void AddStudent_WithMissingFields_ShouldThrowException(StudentDto studentDto) {
    // logic to call service and do an assertion
}

1. 这是你能做的事吗？我收到一条错误消息，提示“属性参数必须是常量表达式...”我想我在某处看到属性只能将原始类型作为参数？
2. 这是错误的方法吗？我应该只传递属性并在测试中创建 dto 吗？

Answer 1

Is this something that you can do? I'm getting an error that says "An Attribute argument must be a constant expression..." I think I saw somewhere that attributes can only take primitive types as arguments?

该消息是正确的。无需进一步解释。

Is this the wrong approach? Should I just pass in the properties and create the dto within the test?

您可以使用原始类型并在测试中创建模型。

[TestMethod]
[DataRow("Leo", 22)]
[DataRow("John", null)]
public void AddStudent_WithMissingFields_ShouldThrowException(string firstName, int? age,) {
    StudentDto studentDto = new StudentDto { 
        FirstName = firstName, 
        Age = age.GetValueOrDefault(0) 
    };
    // logic to call service and do an assertion
}

或者按照评论中的建议，使用[DynamicData] 属性

static IEnumerable<object[]> StudentsData {
    get {
        return [] {
            new object[] {
                new StudentDto { FirstName = "Leo", Age = 22 },
                new StudentDto { FirstName = "John" }
            }
        }
    }
}

[TestMethod]
[DynamicData(nameof(StudentsData))]
public void AddStudent_WithMissingFields_ShouldThrowException(StudentDto studentDto) {
    // logic to call service and do an assertion
}