How to use JUnit 5 with Gradle?

2019-01-10 23:00发布

问题:

I am trying to use JUnit 5 with Gradle after I succeeded in running a JUnit 4 test.

Expected result: Tthe JUnit 4 test gave a nice 'passed' in the output and an html report in build/reports/tests.

Actual result: The JUnit 5 test as below does not output anything besides (...) build succesful, while I know the test is not actually run since there is no test log output passed/skipped/failed, and putting a fail in the test keeps the build successful.

Running gradle test --info yields Skipping task ':testClasses' as it has no actions. among a lot of I think mostly unrelevant output. Surprisingly, it also says Executing task ':test' and Generating HTML test report... Finished generating test html results and similar for the xml in build/test-results/test, while the xml is not generated, the html shows no tests run and no errors, and the test is indeed not run.

What I also think very interesting, is that gradle test --debug yields

[TestEventLogger] Gradle Test Run :test STARTED
[org.gradle.api.internal.tasks.testing.junit.JUnitDetector] test-class-
scan : failed to scan parent class java/lang/Object, could not find the class file
[TestEventLogger]
[TestEventLogger] Gradle Test Run :test PASSED

while my only test contains

fail("test fails");

which I think is very strange!

My build file is

apply plugin: 'java'

test {
    dependsOn 'cleanTest' // run tests every time

}

sourceSets {
    main {
        java {
            srcDirs 'src'
        }
    }
    test {
        java {
            srcDirs 'test'
        }
    }
}

repositories {
    mavenCentral()
}

dependencies {
    // when using this, it worked with a junit 4 test
//    testCompile 'junit:junit:4.10'
    // this should be needed for junit 5 (using M4 is required since IJ 2017.1.2
    testCompile("org.junit.jupiter:junit-jupiter-api:5.0.0-M4")
}

test {
    testLogging {
        events "passed", "skipped", "failed"
    }
}

My test is

package mypackage;

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

public class HelloWorldTest {
    @Test
    public void testHelloWorld(){
        assertEquals(2, 1+1, "message");
    }
}

My folder structure is, using package mypackage,

java-template-project
--- src
    --- mypackage
        --- HelloWorld.java
--- test
    --- mypackage
        --- HelloWorldTest.java

and in IntelliJ 2017.1.3, which I am using, the module structure looks like this

java-template-project
--- java-template-project_main
    --- src/mypackage
        --- HelloWorld(.java)
--- java-template-project_test
    --- test/mypackage
        --- HelloWorldTest(.java)

because Gradle nowadays wants the source and tests in their own package.

What I tried

Obviously this is not the first question about this topic, all the relevant questions I found are

  • Gradle project running jUnit 5 tests in IntelliJ

    But as you can see this is for older versions of IntelliJ, and I am already using the syntax for IJ 2016.3.3 and higher according to one of the answers, in in the one JUnit dependency line, so that should be okay.

  • Upgrade from JUnit 4 to JUnit 5 in intellij with gradle

    Links back to above question, and links to this Jetbrains blog which uses the same line as above question. Also links to:

  • Integrate JUnit 5 tests results with Intellij test report This one shows, in the question, as dependency also

    testRuntime("org.junit.vintage:junit-vintage-engine:5.0.0-M1")
    

    which is explained in Why were JUnit Jupiter and JUnit Vintage separated When I Running TestCase in IntelliJ? Well, when I ran it, the output showed it couldn't find this version but according to the Maven Repository this one is for JUnit 5:

    testRuntime("org.junit.vintage:junit-vintage-engine:4.12.0-M4")
    

    The answers there note that you can just run the tests within IntelliJ since the later versions have JUnit 5 support. I know, and the test runs fine when I run from within IntelliJ. But I want to use Gradle (and Travis, which needs dependency management).

  • How to capture stdout/stderr in junit 5 gradle test report?

    I tried using

    testCompile("org.junit.platform:junit-platform-gradle-plugin:1.0.0-M3")
    testCompile("org.junit.jupiter:junit-jupiter-engine:5.0.0-M3")
    

    but results didn't change.

    My template project is located on https://github.com/PHPirates/java-template-project but this question should contain all information necessary.

回答1:

You need the engines for both JUnit versions, and you need to apply the JUnit platform gradle plugin. I do not see that in your gradle file. Here is a working gradle build executing both JUnit 4 and 5:

buildscript {
    repositories {
        mavenCentral()
    }
    dependencies {
        classpath ("org.junit.platform:junit-platform-gradle-plugin:1.0.0-M4")
    }
}

apply plugin: 'org.junit.platform.gradle.plugin'
...

dependencies {
...
    testCompile("junit:junit:4.12")
    testRuntime("org.junit.vintage:junit-vintage-engine:4.12.0-M4")

    testCompile("org.junit.jupiter:junit-jupiter-api:5.0.0-M4")
    testRuntime("org.junit.jupiter:junit-jupiter-engine:5.0.0-M4")

    // Enable use of the JUnitPlatform Runner within the IDE
    testCompile("org.junit.platform:junit-platform-runner:1.0.0-M4")
}

junitPlatform {
    details 'tree'
}

See the JUnit doc form more information on that.



回答2:

New: JUnit 5 support in Gradle 4.6

As pointed out in this GitHub issue from Gradle 4.6 onwards JUnit 5 is supported! Official release notes of 4.6 (at the moment of editing the latest, but check the link below) at docs.gradle.org. The old setup will still work, but using this makes the build file a lot cleaner.

Update Gradle

First, make sure you are using the latest Gradle version, check latest releases at their GitHub releases. If that is for example 4.6, run in a terminal in your project location gradlew wrapper --gradle-version=4.6 or make sure to update this line in your gradle/wrapper/gradle-wrapper.properties file: distributionUrl=https\://services.gradle.org/distributions/gradle-4.6-all.zip.

How to use the built-in JUnit 5

Then with the java files, directory structure etc. from the question the build.gradle file will be (using the new plugins block)

plugins {
    id 'java'
}

repositories {
    mavenCentral()
    mavenLocal()
}

dependencies {
    testImplementation 'org.junit.jupiter:junit-jupiter-api:5.0.3'
    testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.0.3'
}

// These lines can be removed when you use the default directories src/main/kotlin and src/test/kotlin
sourceSets {
    main.java.srcDirs += 'src'
    main.resources.srcDirs += 'src'
    test.java.srcDirs += 'test'
    test.resources.srcDirs += 'test'
}

// Java target version
sourceCompatibility = 1.8

test {
    // Enable JUnit 5 (Gradle 4.6+).
    useJUnitPlatform()

    // Always run tests, even when nothing changed.
    dependsOn 'cleanTest'

    // Show test results.
    testLogging {
        events "passed", "skipped", "failed"
    }
}

PS For the absolute minimal version, see Ray's answer.



回答3:

just adding to the knowledge base, i just got the following to work with gradle 4.7:

apply plugin: 'java'
repositories {
    jcenter()
}

dependencies {
    testImplementation 'org.junit.jupiter:junit-jupiter-api:5.1.1'
    testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.1.1'
}

test {
    useJUnitPlatform()
}


回答4:

Due to github issue built-in support for JUnit 5, scheduled for Gradle 4.6

Thus since gradle 4.6 your expected result have to be the same as actual result.

Expected result: Tthe JUnit 4 test gave a nice 'passed' in the output and an html report in build/reports/tests.

UPD:

gradle 4.6-rc-1 was released on 16th of February 2018 and this version provides the built-in support for junit 5.

To enable junit 5 support you need to update gradle wrapper:

gradle wrapper --gradle-version=4.6-rc-1

and add just one line to build.gradle:

test {
    useJUnitPlatform()
}


回答5:

Maybe something helpful for those who were struck with this problem when trying to integrate JUnit5 with gradle version 4.10.

Could not find method test() for arguments [build_dzas89s5z18l3bfyn6b3q0dxv$_run_closure2$_closure9@8e60c6] on project ':app' of type org.gradle.api.Project.

Actually, with 4.10 you don't need to add this test configuration block in build.gradle to enable JUnit5.

test {
    useJUnitPlatform()
}

It should work fine just by adding the necessary dependencies of jupitor-api and jupitor-engine.

I tried to explore release notes of 4.10 but couldn't find anything about this change. If someone knows more about the "Why" behind it then please englighten me as well.