passing the mocked arrangement in as an Expression<Action>...

[Arthur]

Was looking for ways to pull the lambda expressions I mock up....this way I could reuse them during the assertion portion of my test.

However when I pass the value in via a variable I get a test exception:
Telerik.JustMock.Core.MockException: The arranged function is not set up to return a value of type Account


Here is a sanitized version of what I'm trying to do?


public Interface IAccountManagement{
   public Account GetAccount(string acctId);
}
........

public void MyTest()
{
   IAccountManagement actMgrMock = Mock.Create<IAccountManagement>();
   Account acct = TestHelpers.AutoGenerateAccount;  //generate an acct object with Ploeh.AutoFixture

   Expression<Action> GetAccount = () => actMgrMock.GetAccount(Arg.IsAny<string>());

  //Mock.Arrange(GetAccount).Returns(e);   //<------this call will not work when I invoke the test?

  Mock.Arrange(() => actMgrMock.GetAccount(Arg.IsAny<string>())).Returns(e); //  This one works?

  // invoke
  
  //Assert
  //Mock.Assert(GetAccount,Occurs.Once());

}
  

[GiZ]

I think the expression has to be of type Expression<Func<Account>> instead of Expression<Action>.

[Ivo]

Hello Arthur,

The issue is caused by the generic argument used in Expression. The arranged method returns a value, so replacing Action with Func<Account> solves the problem. The test code could be changed as following:

[TestMethod]
public void MyTest()
{
    IAccountManagement actMgrMock = Mock.Create<IAccountManagement>();
    Account acct = TestHelpers.AutoGenerateAccount;  //generate an acct object with Ploeh.AutoFixture

    // Arrange
    Expression<Func<Account>> GetAccount = () => actMgrMock.GetAccount(Arg.IsAny<string>());
    Mock.Arrange(GetAccount).Returns(acct);

    // Act
    actMgrMock.GetAccount("fakeId");

    //Assert
    Mock.Assert(GetAccount, Occurs.Once());
}

I hope the provided information helps. If you have further questions do not hesitate to write us back.

Regards,
Ivo
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