Gradle: add a testOn8 task to run tests with Java 8

Author: carlosame

.github/workflows/build.yml

@@ -46,3 +46,7 @@ jobs:
       # Build
       - name: Build with Gradle
         run: ./gradlew build
+
+      # Run tests with Java 8
+      - name: Test with Java 8
+        run: ./gradlew testOn8

README.md

@@ -21,9 +21,10 @@ To build css4j-dom4j from the code that is currently at the Git repository, Java
 You can run a variety of Gradle tasks with the Gradle wrapper (on Windows shells you can omit the `./`):
 
 - `./gradlew build` (normal build)
-- `./gradlew build publishToMavenLocal` (to install in local Maven repository)
+- `./gradlew publishToMavenLocal` (to install in local Maven repository)
 - `./gradlew copyJars` (to copy jar files into a top-level _jar_ directory)
 - `./gradlew lineEndingConversion` (to convert line endings of top-level text files to CRLF)
+- `./gradlew testOn8` (run tests with Java 8)
 - `./gradlew publish` (to deploy to a Maven repository, as described in the `publishing.repositories.maven` block of
 [build.gradle](https://github.com/css4j/css4j-dom4j/blob/master/build.gradle))
 

build.gradle

@@ -177,6 +177,17 @@ tasks.register('checkLegacyJava') {
 
 classes.finalizedBy checkLegacyJava
 
+tasks.register('testOn8', Test) {
+	description = 'Runs tests on Java 8'
+	dependsOn classes
+	testClassesDirs = testing.suites.test.sources.output.classesDirs
+	classpath = testing.suites.test.sources.runtimeClasspath
+	useJUnitPlatform()
+	javaLauncher = javaToolchains.launcherFor {
+		languageVersion = JavaLanguageVersion.of(8)
+	}
+}
+
 // Copy jar files to 'jar' directory
 tasks.register('copyJars', Copy) {
 	description = 'Copy jar files to \'jar\' directory'