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JUnit test exception handling

Exception handling in JUnit tests refers to testing if a particular piece of code throws an expected exception under certain conditions.

To test exception handling in JUnit, you can use the @Test annotation with the expected attribute set to the expected exception. The test method should then be written to cause the expected exception to be thrown. Here's an example:

import org.junit.Test;

public class ExceptionTest {
    @Test(expected = ArithmeticException.class)
    public void divideByZeroTest() {
        int x = 5 / 0;
    }
}

In this example, the divideByZeroTest method is expected to throw an ArithmeticException, which is the exception that is thrown when you try to divide by zero. The test will pass if the exception is thrown, and fail if it is not thrown or if a different exception is thrown.

You can also test for exceptions in JUnit using a try-catch block and using the fail() method to indicate a failure if the expected exception is not thrown. Here's an example:

import org.junit.Test;

public class ExceptionTest {
    @Test
    public void divideByZeroTest() {
        try {
            int x = 5 / 0;
            fail("Expected ArithmeticException not thrown");
        } catch (ArithmeticException e) {
            // expected exception was thrown, test passed
        }
    }
}
In this example, the code inside the try block is expected to throw an ArithmeticException. If the exception is thrown, the test will pass because the catch block will be executed. If the exception is not thrown, the fail method will be called, indicating that the test has failed.


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