似乎未达到对模拟对象的期望(最小起订量) [英] Expectation on Mock Object doesn't seem to be met (Moq)

问题描述

我在Moq中遇到一些奇怪的行为-尽管事实是我设置了一个模拟对象以某种方式工作，然后以与我正在测试的对象完全相同的方式调用该方法，但它的反应就像该方法从未被调用过.

I'm experiencing some odd behavior in Moq - despite the fact that I setup a mock object to act a certain way, and then call the method in the exact same way in the object I'm testing, it reacts as if the method was never called.

我要测试以下控制器操作:

I have the following controller action that I'm trying to test:

public ActionResult Search(string query, bool includeAll)
{
    if (query != null)
    {
        var keywords = query.Split(' ');
        return View(repo.SearchForContacts(keywords, includeAll));
    }
    else
    {
        return View();
    }
}

我的单元测试代码:

public void SearchTestMethod() // Arrange
    var teststring = "Anders Beata";
    var keywords = teststring.Split(' ');
    var includeAll = false;
    var expectedModel = dummyContacts.Where(c => c.Id == 1 || c.Id == 2);
    repository
        .Expect(r => r.SearchForContacts(keywords, includeAll))
        .Returns(expectedModel)
        .Verifiable();

    // Act
    var result = controller.Search(teststring, includeAll) as ViewResult;

    // Assert
    repository.Verify();
    Assert.IsNotNull(result);
    AssertThat.CollectionsAreEqual<Contact>(
        expectedModel, 
        result.ViewData.Model as IEnumerable<Contact>
    );
}

其中AssertThat只是我自己的一个类，带有一堆断言助手(因为Assert类无法使用扩展方法来扩展...叹气...).

where AssertThat is just a class of my own with a bunch of assertion helpers (since the Assert class can't be extended with extension methods... sigh...).

运行测试时，它在repository.Verify()行上失败，并带有MoqVerificationException:

When I run the test, it fails on the repository.Verify() line, with a MoqVerificationException:

Test method MemberDatabase.Tests.Controllers.ContactsControllerTest.SearchTestMethod()
threw exception:  Moq.MockVerificationException: The following expectations were not met:
IRepository r => r.SearchForContacts(value(System.String[]), False)

如果删除repository.Verify()，则集合断言失败，告诉我返回的模型为null.我已经调试并检查了query != null，并且将我带到了运行代码的if块中.那里没问题.

If I remove repository.Verify(), the collection assert fails telling me that the model returned is null. I have debugged and checked that query != null, and that I am taken into the part of the if block where the code is run. No problems there.

为什么这行不通?

推荐答案

我怀疑这是因为您要传递到模拟存储库中的数组(teststring.Split(' ')的结果)与实际获得的对象不是同一对象通过Search方法(query.Split(' ')的结果)传入.

I suspect it's because the array you're passing into your mocked repository (the result of teststring.Split(' ')) is not the same object as the one that actually gets passed in from the Search method (the result of query.Split(' ')).

尝试将安装代码的第一行替换为:

Try replacing the first line of your setup code with:

repository.Expect(r => r.SearchForContacts(
    It.Is<String[]>(s => s.SequenceEqual(keywords)), includeAll))

...，它将比较传递给模拟对象的数组的每个元素与keywords数组中的相应元素.

... which will compare each element of the array passed to your mock with the corresponding element in the keywords array.

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