英文:
Is there a way to assign value to object using mocks
问题
Sure, here's the translated content:
我有一个方法，它：
- 接受字符串作为参数。
- 使用该字符串创建对象。
- 将该对象传递给另一个方法。
- 然后，第二个方法更改该对象上的属性。
- 接着，原始方法检查是否已更改该属性，如果没有更改，则抛出异常。
以下是代码。这个方法不能被修改。
internal sealed class CreateUserCommandHandler
{
private readonly IUserRepository _userRepository;
public CreateUserCommandHandler(IUserRepository userRepository)
{
_userRepository = userRepository;
}
public async Task Handle(string firstName)
{
var user = new User(firstName);
await _userRepository.CreateUser(user);
if (user.Id == null)
throw new Exception("User Id is null after creation.");
}
}
我想使用单元测试来测试这个方法。我不知道如何设置用户存储库模拟，以便它会分配id属性。
[Fact]
public async Task GivenCorrectCommand_WhenHandlerIsExecuted_ThenEntityShouldContainId()
{
// 准备;
var firstName = "FirstName";
var commandHandler = new CreateUserCommandHandler(_userRepositoryMock.Object);
// 执行
// 这会因为user.Id属性等于null而引发异常
var result = await commandHandler.Handle(firstName);
// 断言
result.Should().NotBeNullOrWhiteSpace();
}
我使用的是.NET 7，xUnit，Moq和FluentAssertions，如果可能的话，我宁愿不引入新的库。
英文:
I have a method that:
- Accepts string as a parameter.
- Creates object using that string.
- Passes that object into another method.
- That second method then changes a property on that object.
- Then the original method checks if that property was changed, and throws an exception if it wasn't.
Code below. This method cannot be modified.
internal sealed class CreateUserCommandHandler
{
private readonly IUserRepository _userRepository;
public CreateUserCommandHandler(IUserRepository userRepository)
{
_userRepository = userRepository;
}
public async Task Handle(string firstName)
{
var user = new User(firstName);
await _userRepository.CreateUser(user);
if (user.Id == null)
throw new Exception("User Id is null after creation.");
}
}
I want to test this method with unit tests. I don't know how to set up a user repository mock so that it would assign id property.
[Fact]
public async Task GivenCorrectCommand_WhenHandlerIsExecuted_ThenEntityShouldContainId()
{
// Arrange;
var firstName = "FirstName";
var commandHandler = new CreateUserCommandHandler(_userRepositoryMock.Object);
// Act
// This throws an exception because of the user.Id property is equal to null
var result = await commandHandler.Handle(firstName);
// Assert
result.Should().NotBeNullOrWhiteSpace();
}
I am using .NET 7, xUnit, Moq and FluentAssertions, I would prefer not to introduce new library if possible.
答案1
得分: 1
你可以在userRepositoryMock中加入一些逻辑，就像这样：
_userRepositoryMock
.Setup(x => x.CreateUser(It.IsAny<User>()))
.Callback((User u) => u.Id = 123);
英文:
You can put some logic into userRepositoryMock like this
_userRepositoryMock
.Setup(x => x.CreateUser(It.IsAny<User>()))
.Callback((User u) => u.Id = 123);
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