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What steps should I take to update my project to use the latest versions of Mockito, JUnit, and Hamcrest


Updating your project to use the latest versions of Mockito, JUnit, and Hamcrest involves several steps. Here's a detailed guide to help you through the process:

Step 1: Update Mockito

First, you need to update Mockito to the latest version. As of the latest updates, Mockito version 5.16.0 is available. You can update your project by changing the version in your Maven or Gradle dependencies.

For Maven, update the `mockito-core` dependency in your `pom.xml` file: 

xml

    org.mockito
    mockito-core
    5.16.0
    test

For Gradle, update the `mockito-core` dependency in your `build.gradle` file: 

groovy
testImplementation 'org.mockito:mockito-core:5.16.0'

Step 2: Update JUnit

Next, ensure you are using JUnit 5 (Jupiter) instead of JUnit 4. JUnit 5 is the latest major version and offers better features and compatibility with modern testing frameworks like Mockito.

For Maven, add or update the JUnit 5 dependencies in your `pom.xml`: 

xml

    org.junit.jupiter
    junit-jupiter-api
    5.11.2
    test


    org.junit.jupiter
    junit-jupiter-engine
    5.11.2
    test

For Gradle, update the JUnit 5 dependencies in your `build.gradle`: 

groovy
testImplementation 'org.junit.jupiter:junit-jupiter-api:5.11.2'
testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.11.2'

Step 3: Update Hamcrest

Hamcrest is typically used with Mockito for matchers. The latest version of Hamcrest is 2.2. You should update your Hamcrest dependency to this version.

For Maven, update the Hamcrest dependency in your `pom.xml`: 

xml

    org.hamcrest
    hamcrest
    2.2
    test

For Gradle, update the Hamcrest dependency in your `build.gradle`: 

groovy
testImplementation 'org.hamcrest:hamcrest:2.2'

Step 4: Adjust Mockito JUnit 5 Extension

If you are using JUnit 5, you need to use the `mockito-junit-jupiter` extension instead of the old `MockitoJUnitRunner`. Add this dependency to your project.

For Maven: 

xml

    org.mockito
    mockito-junit-jupiter
    5.16.0
    test

For Gradle: 

groovy
testImplementation 'org.mockito:mockito-junit-jupiter:5.16.0'

Step 5: Update Code to Use New Versions

After updating your dependencies, review your code for any deprecated methods or classes. For example, Mockito 2 and later versions moved matchers from `org.mockito.Matchers` to `org.mockito.ArgumentMatchers`. Update your imports accordingly. 

java
// Before
import static org.mockito.Matchers.any;

// After
import static org.mockito.ArgumentMatchers.any;

Additionally, if you were using `MockitoJUnitRunner` with JUnit 4, switch to using the `@ExtendWith(MockitoExtension.class)` annotation with JUnit 5. 

java
// Before JUnit 4
@RunWith(MockitoJUnitRunner.class)
public class MyTest {
    // ...
}

// After JUnit 5
@ExtendWith(MockitoExtension.class)
public class MyTest {
    // ...
}

By following these steps, you should be able to update your project to use the latest versions of Mockito, JUnit, and Hamcrest smoothly.

Citations:
[1] https://stackoverflow.com/questions/18770943/mockito-junit-hamcrest-versioning
[2] https://docs.openrewrite.org/recipes/java/testing/mockito/mockito1to4migration
[3] https://www.vogella.com/tutorials/Mockito/article.html
[4] https://github.com/mockito/mockito/releases
[5] https://site.mockito.org
[6] https://www.arhohuttunen.com/junit-5-migration/
[7] https://support.intershop.com/kb/go.php/a/ENFDEVDOC/pages/1827636063/Guide+-+7.10+Migration+Mockito+1+to+Mockito+2
[8] https://stackoverflow.com/questions/77234542/migration-from-java-8-to-java-17-and-spring-6-junit4-failing-due-to-version-mism
[9] https://docs.openrewrite.org/recipes/java/testing/mockito/mockito1to3migration