Using Moq to see if method was called with a value

Question

Using Microsoft Visual Studio 2017's built in test with Moq.

I have a simple class that creates some content, then sends the content to a notification system. I need to test if the notification system was called, but that the call included some text.

 public void DoStuff()
            var tenantSettings = _tenantService.GetTenantSettings();
            tenantSettings.Body = "xxx SOME VALUE xxx";
            MyService.SendMail(tenantSettings.Body);

How can I test that SendMail contains the text "SOME VALUE"?

I have a MOCK setup:

 MyServiceMock.Setup(x=>x.SendMail(It.IsAny<string>);

score 7 · Accepted Answer · edited May 23 '17 at 11:53

7

You can simply use Verify method on your mock:

MyServiceMock.Verify(x => x.SendMail("SOME VALUE"), Times.Once());

Edit:

If you want to verify whether the text passed as a parameter does not matches exactly, but just contains the tested value, you can use, as Scott Chamberlain wrote:

MyServiceMock.Verify(x => x.SendMail(It.Is<string>(s => s.Contains("SOME VALUE")), Times.Once());

edited May 23 '17 at 11:53

Community

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answered Jan 31 '17 at 18:12

tdragon

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Note, this only matches the exact value `"SOME VALUE"` if the passed in string is `"xxx SOME VALUE xxx"` that will not match with this code. – Scott Chamberlain Jan 31 '17 at 18:21
That's true, I did not see the edit, the original question was different – tdragon Jan 31 '17 at 18:31

score 2 · Answer 2 · answered Jan 31 '17 at 18:24

You need to use the Verify function allong with the It.Is<TValue>(Func<TValue,bool>) function to search for the substring.

MyServiceMock.Verify(x => x.SendMail(It.Is<string>(s => s.Contains("SOME VALUE")), Times.Once());

You put this line at the end of your test function after DoStuff() has been called.

Using Moq to see if method was called with a value

2 Answers2