[java] How do I assert my exception message with JUnit Test annotation?

I like user64141's answer but found that it could be more generalized. Here's my take:

public abstract class ExpectedThrowableAsserter implements Runnable {

    private final Class<? extends Throwable> throwableClass;
    private final String expectedExceptionMessage;

    protected ExpectedThrowableAsserter(Class<? extends Throwable> throwableClass, String expectedExceptionMessage) {
        this.throwableClass = throwableClass;
        this.expectedExceptionMessage = expectedExceptionMessage;
    }

    public final void run() {
        try {
            expectException();
        } catch (Throwable e) {
            assertTrue(String.format("Caught unexpected %s", e.getClass().getSimpleName()), throwableClass.isInstance(e));
            assertEquals(String.format("%s caught, but unexpected message", throwableClass.getSimpleName()), expectedExceptionMessage, e.getMessage());
            return;
        }
        fail(String.format("Expected %s, but no exception was thrown.", throwableClass.getSimpleName()));
    }

    protected abstract void expectException();

}

Note that leaving the "fail" statement within the try block causes the related assertion exception to be caught; using return within the catch statement prevents this.

Examples related to java

Under what circumstances can I call findViewById with an Options Menu / Action Bar item? How much should a function trust another function How to implement a simple scenario the OO way Two constructors How do I get some variable from another class in Java? this in equals method How to split a string in two and store it in a field How to do perspective fixing? String index out of range: 4 My eclipse won't open, i download the bundle pack it keeps saying error log

Examples related to testing

Test process.env with Jest How to configure "Shorten command line" method for whole project in IntelliJ Jest spyOn function called Simulate a button click in Jest Mockito - NullpointerException when stubbing Method toBe(true) vs toBeTruthy() vs toBeTrue() How-to turn off all SSL checks for postman for a specific site What is the difference between smoke testing and sanity testing? ReferenceError: describe is not defined NodeJs How to properly assert that an exception gets raised in pytest?

Examples related to annotations

How to inject a Map using the @Value Spring Annotation? intellij incorrectly saying no beans of type found for autowired repository @Autowired - No qualifying bean of type found for dependency Difference between @Before, @BeforeClass, @BeforeEach and @BeforeAll Can't find @Nullable inside javax.annotation.* Name attribute in @Entity and @Table Get rid of "The value for annotation attribute must be a constant expression" message @Value annotation type casting to Integer from String What does -> mean in Python function definitions? @Nullable annotation usage

Examples related to junit4

Mockito: Mock private field initialization java.lang.Exception: No runnable methods exception in running JUnits How to write JUnit test with Spring Autowire? How to run JUnit tests with Gradle? Difference between @Before, @BeforeClass, @BeforeEach and @BeforeAll How to test that no exception is thrown? Failed to load ApplicationContext for JUnit test of Spring controller How does Junit @Rule work? maven error: package org.junit does not exist How do I assert an Iterable contains elements with a certain property?

Examples related to assertion

How to verify a Text present in the loaded page through WebDriver Best way to check that element is not present using Selenium WebDriver with java What is the use of "assert"? Assert that a WebElement is not present using Selenium WebDriver with java What does the "assert" keyword do? Why do I get a C malloc assertion failure? How do I assert my exception message with JUnit Test annotation? How do I use Assert.Throws to assert the type of the exception? Best practice for using assert?