How Can JUnit 5\'s `assertThrows()` Optimize Multiple Exception Verification in Tests?

JUnit 5 Exception Assertions: Optimizing for Multiple Exception Verification

In JUnit 5, testing for exceptions has been simplified with the introduction of assertThrows(). This approach provides a convenient and concise way to verify that methods throw expected exceptions, addressing the limitations of using @Rule for handling multiple exceptions within a test.

Improved Exception Testing with assertThrows()

assertThrows() allows you to define an assertion for a specific exception type and execute a lambda expression that triggers the exception. By incorporating this approach, you can evaluate multiple exceptions within a single test. Here's an example:

import static org.junit.jupiter.api.Assertions.assertThrows;

@Test
void exceptionTesting() {
    MyException thrown = assertThrows(
        MyException.class,
        () -> myObject.doThing(),
        "Expected doThing() to throw, but it didn't"
    );

    assertTrue(thrown.getMessage().contains("Stuff"));
}

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