How to replace Assert.Fail() with FluentAssertions
Restructure the test to utilize the .ShouldThrow<>
assertion extension.
[TestMethod, TestCategory("ImportantTest")]
public void MethodToTest_Circumstances_ExpectedResult() {
// Arrange
var variable1 = new Type1() { Value = "hello" };
var variable2 = new Type2() { Name = "Bob" };
// Act
Action act = () => MethodToTest(variable1, variable2);
// Assert
// This method should have thrown an exception
act.ShouldThrow<DataException>()
.WithMessage(Constants.DataMessageForMethod);
// test that variable1 was changed by the method
variable1.Should().NotBeNull();
variable1.Value.Should().Be("Hello!");
// test that variable2 is unchanged because the method threw an exception before changing it
variable2.Should().NotBeNull();
variable2.Name.Should().Be("Bob");
}
In the above example, if the expected exception is not thrown the the assertion would fail, stopping the test case.
You should review the documentation on asserting exceptions to get a better understanding of how to use the library.
Following the example in here, he just dealt away with the Assert.Fail -- and use action and .ShouldThrow http://www.continuousimprover.com/2011/07/why-i-created-fluent-assertions-in.html