How to include test classes into shadowJar?

Question

I am using shadow Gradle plugin to build JAR, containing all referenced jars inside.

In my build.gradle I have only

apply plugin: "com.github.johnrengelman.shadow"

and

jar {
    manifest {
        attributes 'Main-Class': 'MYCLASS'
    }

}

related to that. I don't know, how it knows, what to build, but it works.

Now, is it possible, to include test classes too?

Barrel

Did you come up with any solution on this one? – Natalya

Answer 1

From the official documentation https://imperceptiblethoughts.com/shadow/custom-tasks/

Shadowing Test Sources and Dependencies

import com.github.jengelman.gradle.plugins.shadow.tasks.ShadowJar task testJar(type: ShadowJar) { classifier = 'tests' from sourceSets.test.output configurations = [project.configurations.testRuntime] }

The code snippet above will geneated a shadowed JAR contain both the main and test sources as well as all runtime and testRuntime dependencies. The file is output to build/libs/--tests.jar.

Tabasco

Unfortunately, the JAR is empty for me. There are neither dependencies nor source classes in it. – Gadwall

Doesn't work for me either. Running the jar just outputs Error: Could not find or load main class org.scalatest.tools.Runner. Btw I have dependencies { testRuntime "org.scalatest:scalatest_${scalaBinaryVersion}:3.0.5" }. – Milestone

@Milestone seeing that these are the official instructions on how to accomplish the task, I would advise you to visit the plugin's github page and open an issue there if necessary. – Tabasco

My tests get included but these won't include the main sources. – Turnbull

Answer 2

The official documentation seems out of date with the latest (v7.0.0) version of the plugin. Using this version and the latest version of gradle (7.0), I do this:

task testJar(type: com.github.jengelman.gradle.plugins.shadow.tasks.ShadowJar) {
    archiveClassifier.set("alltests")
    from sourceSets.main.output, sourceSets.test.output
    configurations = [project.configurations.testRuntimeClasspath]
}

The docs have both the from clause and the "configurations" clause wrong.

• as a comment on the other answer mentions, the main classes (whihc are normally your classes under test) are missing from the jar, so you need to add sourceSets.main.output
• the project.configurations.testRuntime doesn't work as documented, it tells me testImplementation' is not allowed as it is defined as 'canBeResolved=false

Nelan