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Using Java Modularity (JPMS) in Tests

Examples using TestNG

The Surefire project provides the integration tests with TestNG demonstrating the Java Modularity (JPMS).

The JDK version must be 9 or higher. The POM contains the dependency org.testng:testng:7.1.0 which is an automatic module. It activates the internal provider surefire-testng in the plugin. The frameworks with assertions API are used, i.e. org.hamcrest:hamcrest:7.1.0 (automatic module) and org.assertj:assertj-core:3.16.1 (named module).

<properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.compiler.release>${java.specification.version}</maven.compiler.release>
</properties>

<dependencies>
    <dependency>
        <groupId>org.testng</groupId>
        <artifactId>testng</artifactId>
        <version>7.1.0</version>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>org.hamcrest</groupId>
        <artifactId>hamcrest</artifactId>
        <version>2.2</version>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>org.assertj</groupId>
        <artifactId>assertj-core</artifactId>
        <version>3.16.1</version>
        <scope>test</scope>
    </dependency>
</dependencies>

The most important parts are the module descriptors. This is the module descriptor located in src/main/java:

module main
{
    exports main;
}

This is the module descriptor in src/test/java:

module test
{
    requires main;
    requires org.testng;
    requires org.hamcrest;
    requires org.assertj.core;
    exports test to org.testng;
}

Examples using JUnit4

The Surefire project provides the integration tests with JUnit4 demonstrating the Java Modularity (JPMS).

The JDK version must be 9 or higher. The POM contains the dependency junit:junit:4.13 which is an automatic module. It activates the internal provider surefire-junit4 or surefire-junit47 in the plugin.

<properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.compiler.release>${java.specification.version}</maven.compiler.release>
</properties>

<dependencies>
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.13</version>
        <scope>test</scope>
        <exclusions>
            <exclusion>
                <groupId>org.hamcrest</groupId>
                <artifactId>hamcrest-core</artifactId>
            </exclusion>
        </exclusions>
    </dependency>
    <dependency>
        <groupId>org.hamcrest</groupId>
        <artifactId>hamcrest</artifactId>
        <version>2.2</version>
        <scope>test</scope>
    </dependency>
</dependencies>

The most important parts are the module descriptors. This is the module descriptor located in src/main/java:

module main
{
    exports main;
}

This is the module descriptor in src/test/java:

module test
{
    requires main;
    requires junit;
    requires org.hamcrest;
    exports test to junit;
}

Examples using JUnit5

The Surefire project provides the integration tests with JUnit5 demonstrating the Java Modularity (JPMS) in Maven multi-module project.

The JDK version must be 9 or higher. The POM contains the dependency org.junit.jupiter:junit-jupiter-engine:5.6.2 which is named module. It activates the internal provider surefire-junit-platform in the plugin.

<artifactId>com.foo.impl</artifactId>

<dependencies>
    <dependency>
        <groupId>com.foo</groupId>
        <artifactId>com.foo.api</artifactId>
        <version>3.0.0-M5</version>
    </dependency>
    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-simple</artifactId>
    </dependency>
    <dependency>
        <groupId>org.junit.jupiter</groupId>
        <artifactId>junit-jupiter-engine</artifactId>
        <scope>test</scope>
    </dependency>
</dependencies>

The most important parts are the module descriptors. This is the module descriptor located in src/main/java:

module com.foo.impl
{
    exports com.foo.impl;
    requires com.foo.api;
    requires org.slf4j;
    requires org.slf4j.simple;
}

This is the module descriptor in src/test/java:

open module com.foo.test
{
    exports com.foo.implt;
    requires com.foo.impl;
    requires org.slf4j;
    requires org.slf4j.simple;
    requires transitive org.junit.jupiter.engine;
    requires transitive org.junit.jupiter.api;
}

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