Verify() if testing method throws exception. Can we avoid try-catch?-CodePudding

I have a test method:

[Fact]
public void Test001()
{
    var mock = new Mock<IValidator>();

    var sut = new Sut(mock.Object);

    try
    {
        Action a = () => sut.TestedMethod();

        a.Should().Throw<ArgumentException>();
    }
    catch { }

    mock.Verify(x => x.IsValid(), Times.Once);
}

and a TestedMethod:

public void TestedMethod()
{
    _ = _validator.IsValid();

    throw new ArgumentException();
}

Is there any way to get rid of try-catch here?

However, when eliminating try-catch, naturally, the Verification always fails.

Is there any beautiful workaround?

CodePudding user response：

If you would use xunit's built-in Throws function (instead of FluentAssertion) then you don't need the try-catch block.

Simply just:

Assert.Throws<ArgumentException>(() => sut.TestedMethod());

UPDATE #1

The Assert.Throws does not throw exception. It returns the captured exception to allow further assessment, like this:

var actualException = Assert.Throws<ArgumentException>(() => sut.TestedMethod());
Assert.Equal(expectedErrorMessage, actualExcepion.Message);

Since it does not throw exception the test can continue its execution with the Verify check