Verifying a specific parameter with Moq

Question

public void SubmitMessagesToQueue OneMessage SubmitSuccessfully         var messageServiceClientMock   new Mock lt IMessageServiceClient gt         var queueableMessage   CreateSingleQueueableMessage        var message   queueableMessage 0       var xml   QueueableMessageAsXml queueableMessage       messageServiceClientMock Setup proxy   gt  proxy SubmitMessage xml   Verifiable          messageServiceClientMock Setup proxy   gt  proxy SubmitMessage It IsAny lt XmlElement gt      Verifiable         var serviceProxyFactoryStub   new Mock lt IMessageServiceClientFactory gt         serviceProxyFactoryStub Setup proxyFactory   gt  proxyFactory CreateProxy    Returns essageServiceClientMock Object       var loggerStub   new Mock lt ILogger gt          var client   new MessageClient serviceProxyFactoryStub Object  loggerStub Object       client SubmitMessagesToQueue new List lt IMessageRequestDTO gt   message           messageServiceClientMock Verify proxy   gt  proxy SubmitMessage xml   Times Once         messageServiceClientMock Verify        I m starting using Moq and struggling a bit  I m trying to verify that messageServiceClient is receiving the right parameter  which is an XmlElement  but I can t find any way to make it work  It works only when I don t check a particular value   Any ideas   Partial answer  I ve found a way to test that the xml sent to the proxy is correct  but I still don t think it s the right way to do it   public void SubmitMessagesToQueue OneMessage SubmitSuccessfully         var messageServiceClientMock   new Mock lt IMessageServiceClient gt         messageServiceClientMock Setup proxy   gt  proxy SubmitMessage It IsAny lt XmlElement gt      Verifiable        var serviceProxyFactoryStub   new Mock lt IMessageServiceClientFactory gt         serviceProxyFactoryStub Setup proxyFactory   gt  proxyFactory CreateProxy    Returns messageServiceClientMock Object       var loggerStub   new Mock lt ILogger gt          var client   new MessageClient serviceProxyFactoryStub Object  loggerStub Object       var message   CreateMessage        client SubmitMessagesToQueue new List lt IMessageRequestDTO gt   message         messageServiceClientMock Verify proxy   gt  proxy SubmitMessage It Is lt XmlElement gt  xmlElement   gt  XMLDeserializer lt QueueableMessage gt  Deserialize xmlElement  Messages Contains message     Times Once         By the way  how could I extract the expression from the Verify call

User · Accepted Answer

If the verification logic is non-trivial, it will be messy to write a large lambda method (as your example shows). You could put all the test statements in a separate method, but I don't like to do this because it disrupts the flow of reading the test code.

Another option is to use a callback on the Setup call to store the value that was passed into the mocked method, and then write standard Assert methods to validate it. For example:

// Arrange
MyObject saveObject;
mock.Setup(c => c.Method(It.IsAny<int>(), It.IsAny<MyObject>()))
        .Callback<int, MyObject>((i, obj) => saveObject = obj)
        .Returns("xyzzy");

// Act
// ...

// Assert
// Verify Method was called once only
mock.Verify(c => c.Method(It.IsAny<int>(), It.IsAny<MyObject>()), Times.Once());
// Assert about saveObject
Assert.That(saveObject.TheProperty, Is.EqualTo(2));

User · Answer

I believe that the problem in the fact that Moq will check for equality  And  since XmlElement does not override Equals  it s implementation will check for reference equality    Can t you use a custom object  so you can override equals

User · Answer

Had one of these as well  but the parameter of the action was an interface with no public properties  Ended up using It Is   with a seperate method and within this method had to do some mocking of the interface  public interface IQuery       IQuery SetSomeFields string info      void DoSomeQuerying Action lt IQuery gt  queryThing    mockedObject Setup m   gt  m DoSomeQuerying It Is lt Action lt IQuery gt  gt  q   gt  MyCheckingMethod q      private bool MyCheckingMethod Action lt IQuery gt  queryAction        var mockQuery   new Mock lt IQuery gt         mockQuery Setup m   gt  m SetSomeFields It Is lt string gt  s   gt  s MeetsSomeCondition        queryAction Invoke mockQuery Object       mockQuery Verify m   gt  m SetSomeFields It Is lt string gt  s   gt  s MeetsSomeCondition    Times Once      return true

User · Answer

A simpler way would be to do   ObjectA Verify      a   gt  a Execute          It Is lt Params gt  p   gt  p Id    7

User · Answer

I ve been verifying calls in the same manner - I believe it is the right way to do it   mockSomething Verify ms   gt  ms Method      It IsAny lt int gt          It Is lt MyObject gt  mo   gt  mo Id    5  amp  amp  mo description     test        Times Once       If your lambda expression becomes unwieldy  you could create a function that takes MyObject as input and outputs true false     mockSomething Verify ms   gt  ms Method      It IsAny lt int gt          It Is lt MyObject gt  mo   gt  MyObjectFunc mo        Times Once      private bool MyObjectFunc MyObject myObject      return myObject Id    5  amp  amp  myObject description     test       Also  be aware of a bug with Mock where the error message states that the method was called multiple times when it wasn t called at all   They might have fixed it by now - but if you see that message you might consider verifying that the method was actually called   EDIT  Here is an example of calling verify multiple times for those scenarios where you want to verify that you call a function for each object in a list  for example    foreach  var item in myList    mockRepository Verify mr   gt  mr Update      It Is lt MyObject gt  i   gt  i Id    item Id  amp  amp  i LastUpdated    item LastUpdated       Times Once       Same approach for setup     foreach  var item in myList      var stuff          some result specific to the item   this mockRepository      Setup mr   gt  mr GetStuff item itemId        Returns stuff       So each time GetStuff is called for that itemId  it will return stuff specific to that item   Alternatively  you could use a function that takes itemId as input and returns stuff   this mockRepository      Setup mr   gt  mr GetStuff It IsAny lt int gt           Returns  int id    gt  SomeFunctionThatReturnsStuff id      One other method I saw on a blog some time back  Phil Haack perhaps   had setup returning from some kind of dequeue object - each time the function was called it would pull an item from a queue

[c#] Verifying a specific parameter with Moq

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