In C#, How Can I Utilize Assert In MSTest To Confirm The Occurrence Of An Exception Being Thrown?

In C# with MSTest, you can use the Assert.ThrowsException method to verify that an exception has been thrown. Here’s an example:

[TestClass]
public class MyTestClass
{
    [TestMethod]
    public void MyTestMethod()
    {
        // Arrange
        var myObject = new MyObject();

        // Act and Assert
        Assert.ThrowsException<SomeException>(() => myObject.MyMethod());
    }
}

public class MyObject
{
    public void MyMethod()
    {
        // Some code that should throw an exception
        throw new SomeException("Something went wrong!");
    }
}

public class SomeException : Exception
{
    public SomeException(string message) : base(message)
    {
        // Additional logic, if any
    }
}

In the example above, the MyTestMethod throws an exception of type SomeException when calling myObject.MyMethod(). The Assert.ThrowsException method verifies this behavior by checking whether the expected exception is being thrown.

If the expected exception is thrown during the execution of the code inside the lambda expression, the test passes. Otherwise, if the exception is not thrown or if a different type of exception is thrown, the test fails.

You can replace SomeException with the specific type of exception that you expect to be thrown.

About the Author Rex

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