最小起订量:指定返回值作为期望的一部分 [英] Moq: Specifying return values as part of expectations

问题描述

我是Moq和学习的新手.

I'm new to Moq and learning.

我需要测试方法是否返回预期的值.我整理了一个点头的例子来解释我的问题. 此操作失败的原因是:

I need to test that a method returns the value expected. I have put together a noddy example to explain my problem. This fails miserably with:

"ArgumentException:表达式不是方法调用:c =>(c.DoSomething("Jo"，"Blog"，1)="OK")"

"ArgumentException: Expression is not a method invocation: c => (c.DoSomething("Jo", "Blog", 1) = "OK")"

您能纠正我做错了吗?

[TestFixtureAttribute, CategoryAttribute("Customer")]
public class Can_test_a_customer
{
    [TestAttribute]
    public void Can_do_something()
    {
        var customerMock = new Mock<ICustomer>();

        customerMock.Setup(c => c.DoSomething("Jo", "Blog", 1)).Returns("OK");

        customerMock.Verify(c => c.DoSomething("Jo", "Blog", 1)=="OK");
    }
}

public interface ICustomer
{
    string DoSomething(string name, string surname, int age);
}

public class Customer : ICustomer
{
    public string DoSomething(string name, string surname, int age)
    {
        return "OK";
    }
}

简而言之:如果我想测试上述方法，并且知道要返回"OK"，我将如何使用Moq编写它?

In a nutshell: if I wanted to test a method like the one above, and I know that I am expecting back an "OK", how would I write it using Moq?

谢谢您的建议.

推荐答案

1. 您需要一个与模拟对象进行交互的测试主题(除非您正在为Moq编写学习者测试.)我在下面写了一个简单的主题
2. 您在模拟对象上设置期望值，指定确切的参数(严格-如果您愿意，则使用Is.Any<string>接受任何字符串)，并指定返回值(如果有)
3. 您的测试对象(作为测试的行为"步骤的一部分)将调用您的模拟游戏
4. 您断言测试对象的行为符合要求.模拟方法的返回值将由测试对象使用-通过测试对象的公共接口对其进行验证.
5. 您还验证是否满足您指定的所有期望-实际上已经调用了您希望被调用的所有方法.

1. You need a test subject that interacts with mock objects (unless you're writing a learner test for Moq.) I wrote up a simple one below
2. You setup expectations on the mock object, specifying the exact arguments (strict - if you wish to ofcourse, else use Is.Any<string> to accept any string) and specify return values if any
3. Your test subject (as part of the Act step of the test) will call onto your mock
4. You assert the test subject behaved as required. The return value from the mock methods will be used by the test subject - verify it via the test subject's public interface.
5. You also verify that all expectations that you specified were met - all methods that you expected to be called were in fact called.

.

[TestFixture]
public class Can_test_a_customer
{
  [Test]
  public void Can_do_something()
  {
    //arrange
    var customerMock = new Moq.Mock<ICustomer>();
    customerMock.Setup(c => c.DoSomething( Moq.It.Is<string>(name => name == "Jo"),
         Moq.It.Is<string>(surname => surname == "Blog"),
         Moq.It.Is<int>(age => age == 1)))
       .Returns("OK");

    //act
    var result = TestSubject.QueryCustomer(customerMock.Object);

    //assert
    Assert.AreEqual("OK", result, "Should have got an 'OK' from the customer");
    customerMock.VerifyAll();
  }
}

class TestSubject
{
  public static string QueryCustomer(ICustomer customer)
  {
    return customer.DoSomething("Jo", "Blog", 1);
  }
}

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