[英]Mock Linq `Any` predicate with Moq
我正在尝试使用以下代码在我的存储库中模拟AnyAsync
方法,但存储库始终返回false
。
AnyAsync
的签名是:
Task<bool> AnyAsync<TEntity>(Expression<Func<TEntiry, bool>> predicate)
我尝试了以下设置:
1:
mockCustomerRepository.Setup(r => r.AnyAsync(c => c.Email == "some@one.com"))
.ReturnsAsync(true);
2:
Expression<Func<CustomerEntity, bool>> predicate = expr =>
expr.CustomerPerson.Email == "some@one.com";
mockCustomerRepository.Setup(r => r.AnyAsync(It.Is<Expression<Func<CustomerEntity, bool>>>
(criteria => criteria == predicate))).ReturnsAsync(true);
3:
mockCustomerRepository.Setup(r => r.AnyAsync(It.IsAny<Expression<Func<CustomerEntity, bool>>>()))
.ReturnsAsync(true);
我的测试:
public class Test
{
Mock<ICustomerRepository> mockCustomerRepository;
public Test()
{
mockCustomerRepository = new Mock<ICustomerRepository>();
}
[Fact]
public async Task CustomerTest()
{
var customer = ObjectFactory.CreateCustomer(email: "some@one.com");
var sut = new CustomerService(mockCustomerRepository.Object);
var result = await sut.ValidateCustomerAsync(customer);
.
.
.
}
}
我的CustomerService.ValidateCustomerAsync
方法:
public async Task<OperationResult> ValidateCustomerAsync(CustomerEntity customer)
{
var errors = new List<ValidationResult>();
if (await _repository.AnyAsync(c => c.Email == customer.Email))
errors.Add(new ValidationResult("blah blah")));
我也读过这个,但它也不行。
以下代码段显示了模拟AnyAsync
方法的正确方法:
[TestMethod]
public async Task TestMethod1()
{
var fakeCustomerRepo = new Mock<ICustomerRepository>();
var foo = false;
fakeCustomerRepo.Setup(repository => repository.AnyAsync(It.IsAny<Expression<Func<CustomerEntity, bool>>>()))
.Callback<Expression<Func<CustomerEntity, bool>>>(
expression =>
{
var func = expression.Compile();
foo = func(new CustomerEntity() {Email = "foo@gmail.com"});
})
.Returns(() => Task.FromResult(foo));
var customer = new CustomerEntity() {Email = "foo@gmail.com"};
var result = await fakeCustomerRepo.Object.AnyAsync<CustomerEntity>(c => c.Email == customer.Email);
Assert.IsTrue(result);
customer = new CustomerEntity() { Email = "boo@gmail.com" };
result = await fakeCustomerRepo.Object.AnyAsync<CustomerEntity>(c => c.Email == customer.Email);
Assert.IsFalse(result);
}
使用上面的设置,您可以验证作为单位行为一部分的谓词。
我认为你遇到了匹配谓词的困难。 Func的Func或表达式使用引用相等,因此只使用==
来比较这两个实例是行不通的。 (作为一般规则,如果你不能让predicate1.Equals(predicate2)
返回true,那么Moq的参数匹配器将不会匹配。)
这有点不正统,但我引用了你对FakeItEasy匹配器的类似问题的回答 ,这反过来又指出了许多用于验证谓词的技巧。
我只能看到应该导致这个问题的两个选择:
1.存储库方法不是来自您应该模拟返回所需值的接口,因为它没有标记为virtual
。
2.使用moq时,方法中使用的类型( TEntity
)不匹配。
AnyAsync<TEntity>(Expression<Func<TEntity, bool>>
你可以设置为让我们说MemberEntity
并使用CustomerEntity
调用ValidateCustomerAsync
。
也许我错了,但是,据我所知,对于只返回任务的方法,可以并且应该使用.Returns(Task.FromResult(default(object)))
。
所以在你的情况下,它将是mocksCustomerRepository.Setup(r => r.AnyAsync(c => c.Email == "some@one.com")).Returns(Task.FromResult(true));
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