How to Convert Test Scripts From JUnit 4 To JUnit 5 | LambdaTest

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#1

:wave: Hello, testers!

Ready to upgrade your test scripts? :movie_camera: Watch this video to learn how to seamlessly convert your test scripts from JUnit 4 to JUnit 5. :chart_with_upwards_trend::sparkles:

#JUnit #Testing #QualityAssurance #TestAutomation #JUnit5 #JUnit4

#2

Good Insights! Adding mine too :innocent:

Converting test scripts from JUnit 4 to JUnit 5 involves several steps.

Key Steps:

Update Annotations: Replace JUnit 4 annotations with their JUnit 5 equivalents.

Dependencies: Update your build tool (Maven/Gradle) to include JUnit 5 dependencies.

Example:

JUnit 4:
import org.junit.Test;
import static org.junit.Assert.assertEquals;

public class ExampleTest {
    @Test
    public void testAddition() {
        assertEquals(2, 1 + 1);
    }
}

JUnit 5:
import org.junit.jupiter.api.Test;
import static org.junit.jupiter.api.Assertions.assertEquals;

public class ExampleTest {
    @Test
    void testAddition() {
        assertEquals(2, 1 + 1);
    }
}

Dependencies (Maven):
<dependency>
    <groupId>org.junit.jupiter</groupId>
    <artifactId>junit-jupiter-engine</artifactId>
    <version>5.7.0</version>
    <scope>test</scope>
</dependency>
#3

You can try this as well!

Using JUnit Vintage Engine :

Vintage Engine: Use JUnit Vintage to run JUnit 4 tests within the JUnit 5 platform. This allows a gradual migration.

Dependencies: Include JUnit Vintage in your project.

JUnit 4 tests remain unchanged:

import org.junit.Test;
import static org.junit.Assert.assertEquals;

public class ExampleTest {
    @Test
    public void testAddition() {
        assertEquals(2, 1 + 1);
    }
}

Dependencies (Maven):

<dependency>
    <groupId>org.junit.jupiter</groupId>
    <artifactId>junit-jupiter-engine</artifactId>
    <version>5.7.0</version>
    <scope>test</scope>
</dependency>
<dependency>
    <groupId>org.junit.vintage</groupId>
    <artifactId>junit-vintage-engine</artifactId>
    <version>5.7.0</version>
    <scope>test</scope>
</dependency>

Gradual Migration: Convert tests incrementally to JUnit 5 while using JUnit Vintage to run the remaining JUnit 4 tests.

#4

In my experience, transitioning from JUnit 4 to JUnit 5 can significantly improve your testing process by leveraging modern features and annotations.

How to Convert Test Scripts From JUnit 4 to JUnit 5:

Refactoring Test Lifecycle Methods: Update lifecycle method annotations by replacing JUnit 4 annotations with their JUnit 5 equivalents.

Assertions and Assumptions: Modernize assertions and assumptions to align with JUnit 5 standards.

JUnit 4:

import org.junit.Before;
import org.junit.After;
import org.junit.Test;
import static org.junit.Assert.assertEquals;

public class ExampleTest {
    @Before
    public void setUp() {
        // Setup code
    }

    @After
    public void tearDown() {
        // Teardown code
    }

    @Test
    public void testAddition() {
        assertEquals(2, 1 + 1);
    }
}

JUnit 5:

import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.AfterEach;
import org.junit.jupiter.api.Test;
import static org.junit.jupiter.api.Assertions.assertEquals;

public class ExampleTest {
    @BeforeEach
    void setUp() {
        // Setup code
    }

    @AfterEach
    void tearDown() {
        // Teardown code
    }

    @Test
    void testAddition() {
        assertEquals(2, 1 + 1);
    }
}

By following these steps, you can seamlessly transition your test scripts from JUnit 4 to JUnit 5, ensuring your tests are up-to-date with the latest standards and features.