Gain insights into JUnit 5, explore its advantages over JUnit 4, and delve into its features like assertions, parameterized tests, dependency injection, and test execution order. Discover hands-on projects to cement your skills.

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JUnit 5 is a standard framework for unit testing in Java. Released in 2017, JUnit 5 is a major improvement over JUnit 4 and supports a lot of new methods. Many projects have migrated from JUnit 4 to JUnit 5. JUnit 5 is also the default test framework for new projects. JUnit 5 is composed of three sub-projects: JUnit Platform, JUnit Jupiter, and JUnit Vintage. Details of these sub-projects are discussed in the course.

This course first discusses the advantages of JUnit 5 over the previous versions and then jumps directly into tests. The course includes discussion on assertions, assumptions, tagging and filtering, nested tests, dependency injection, repeated tests, parameterized tests, dynamic tests, test instance lifecycle, extension model, JUnit 4 migration, JUnit platform, and test execution order. 

By the end of this course, you’ll be deeply familiar with unit testing in JUnit 5. There’s also a little project for you at the end to put your newly acquired skills to the test.

All About JUnit5

# The `assertTimeout()` method
The `assertTimeout()` method asserts that execution of the given `Executable` completes before the
given timeout. The timeout value is specified as a `java.time.Duration` object.



There are basically three useful overloaded methods for `assertTimeout`:

assertTimeout(Duration timeout, Executable executable)
assertTimeout(Duration timeout, Executable executable, String message)
assertTimeout(Duration timeout, Executable executable, Supplier<String>
messageSupplier)


# Examples of `assertTimeout()`
Let’s look at some examples of the methods above:

import static org.junit.jupiter.api.Assertions.assertTimeout;
import java.time.Duration;


public class TimeoutTest {
    @Test
    @DisplayName("Simple assertTimeout")
    public void simpleTimeout() 
    {
        assertTimeout(Duration.ofSeconds(5), () -> Thread.sleep(3000));
    }
}

>**Note:** The methods above give the same output with the supplier message.

The three `assertTimeout()` methods mentioned above simply return void. We can use the functional interface `org.junit.jupiter.api.function.ThrowingSupplier` to provide a value when the assertion passes. The `get` method in `ThrowingSupplier` can throw any number of `Throwable` values.

Learn how to use the assertTimeout() method in JUnit 5.

Getting Started

Writing Basic Tests

Annotations, Tagging, and Filtering

Nested tests in JUnit 5

Dependency Injections

Parameterized and Dynamic Tests

Test Instance Lifecycle in JUnit 5

Extension Model

JUnit Platform

Test Execution Order

Conclusion

Library Management System

Assertion: assertTimeout()

The `assertTimeout()` method

Examples of `assertTimeout()`

Library Management System

Assertion: assertTimeout()

The assertTimeout() method

Examples of assertTimeout()

The `assertTimeout()` method

Examples of `assertTimeout()`