How do you test code that uses exceptions overview?

Testing code that utilizes exceptions involves creating unit tests that assert the proper handling of exceptions as expected during the execution of the code. The goal is to ensure that exceptions are thrown in the right situations, caught correctly, and that any relevant data is handled appropriately. Below is an overview of how one might achieve this in Java using a testing framework such as JUnit.

When writing tests for methods that throw exceptions, you can use various approaches, such as the expected exceptions feature in JUnit or using the assertThrows method to verify that the correct type of exception is thrown when an invalid input is provided.

Here's an example demonstrating how to test for exceptions in Java:


    import org.junit.jupiter.api.Test;
    import static org.junit.jupiter.api.Assertions.*;

    public class ExceptionTest {

        @Test
        public void testExceptionIsThrown() {
            Exception throwingException = assertThrows(IllegalArgumentException.class, () -> {
                someMethodThatThrowsException(0);
            });
            assertEquals("Input cannot be zero", throwingException.getMessage());
        }

        private void someMethodThatThrowsException(int input) {
            if (input == 0) {
                throw new IllegalArgumentException("Input cannot be zero");
            }
            // method logic
        }
    }

How do you test code that uses exceptions overview?

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How do you test code that uses exceptions overview?

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