How do I include a dependency's test jar into a Maven project's deployment?

Better to configure maven pom file in your first module

<project>    <groupId>com.example</groupId>    <artifactId>foo</artifactId>    <version>1.0.0-SNAPSHOT</version>    <packaging>jar</packaging>    <build>        <plugins>            ...            <plugin>                <groupId>org.apache.maven.plugins</groupId>                <artifactId>maven-jar-plugin</artifactId>                <executions>                    <execution>                        <goals>                            <goal>test-jar</goal>                        </goals>                    </execution>                </executions>            </plugin>

After this a mvn install/release will also deploy an artifact foo-1.0.0-SNAPSHOT-tests.jar

Then configure the dependency on the test jar with classifier (like suggested in other responses)

<dependency>    <groupId>com.example</groupId>    <artifactId>foo</artifactId>    <version>1.0.0-SNAPSHOT</version>    <type>test-jar</type>    <!-- uncomment if needed in test scope only         <scope>test</scope>    --></dependency>

I see you use test-jar as type and you used classifier instead of type but probably also with test-jar ... but did you try the following?

<dependency>    <groupId>com.example</groupId>    <artifactId>foo</artifactId>    <version>1.0.0-SNAPSHOT</version>    <classifier>tests</classifier>    <scope>test</scope></dependency>

I'm a bit late to the party, but I hope this helps someone: you can include multiple types of the same dependency. Assume your project depends on common-artifact-1.0.jar, and there's also a test jar common-artifact-1.0-tests.jar.

You can import both the jar and the tests jar by doing this:

<dependencies>    <dependency>        <groupId>my.corp</groupId>        <artifactId>common-artifact</artifactId>        <version>1.0</version>        <type>jar</type>        <scope>compile</scope>    </dependency>    <dependency>        <groupId>my.copr</groupId>        <artifactId>common-artifact</artifactId>        <version>1.0</version>        <type>test-jar</type>        <scope>test</scope> <!-- the "compile" scope also works here -->    </dependency></dependencies>