Added integration test that checks compatibility with different Gradl…

…e versions

build.gradle

@@ -14,14 +14,39 @@ repositories {
 }
 
 
-dependencies {
-    compile gradleApi()
+sourceSets {
+    integrationTest
+}
 
+
+configurations {
+    integrationTestCompile.extendsFrom testCompile
+    integrationTestImplementation.extendsFrom testImplementation
+    integrationTestRuntime.extendsFrom testRuntime
+    integrationTestRuntimeOnly.extendsFrom testRuntimeOnly
+}
+
+
+dependencies {
     testCompile('org.spockframework:spock-core:1.0-groovy-2.4') {
         exclude group: 'org.codehaus.groovy', module: 'groovy-all'
     }
     testCompile 'org.hamcrest:java-hamcrest:2.0.0.0'
 }
 
 
+gradlePlugin {
+    testSourceSets sourceSets.integrationTest
+}
+
+
+task integrationTest(type: Test) {
+    dependsOn pluginUnderTestMetadata
+    group = 'verification'
+    description = 'Runs the integration tests.'
+    testClassesDirs = sourceSets.integrationTest.output.classesDirs
+    classpath = sourceSets.integrationTest.runtimeClasspath
+}
+
+
 apply from: "$rootDir/publishing.gradle"

src/integrationTest/groovy/org/unbrokendome/gradle/plugins/testsets/GradleVersionsCompatibilityTest.groovy

@@ -0,0 +1,50 @@
+package org.unbrokendome.gradle.plugins.testsets
+
+import org.gradle.testkit.runner.GradleRunner
+import org.gradle.testkit.runner.TaskOutcome
+import org.junit.Rule
+import org.junit.rules.TemporaryFolder
+import spock.lang.Specification
+import spock.lang.Unroll
+
+
+class GradleVersionsCompatibilityTest extends Specification {
+
+    @Rule TemporaryFolder projectDir
+
+    File buildFile
+
+
+    def setup() {
+        buildFile = projectDir.newFile('build.gradle')
+
+        buildFile << '''
+                plugins {
+                    id 'org.unbroken-dome.test-sets'
+                }
+                
+                testSets {
+                    integrationTest
+                }
+            '''
+    }
+
+
+    @Unroll
+    def "Plugin should work in Gradle #gradleVersion"(String gradleVersion) {
+        when:
+            def result = GradleRunner.create()
+                    .withGradleVersion(gradleVersion)
+                    .withProjectDir(projectDir.root)
+                    .withPluginClasspath()
+                    .withArguments('integrationTest', '--stacktrace')
+                    .withDebug(true)
+                    .forwardOutput()
+                    .build()
+        then:
+            result.task(':integrationTest').outcome in [ TaskOutcome.NO_SOURCE, TaskOutcome.UP_TO_DATE ]
+
+        where:
+            gradleVersion << [ '4.0', '3.5', '3.3', '3.2.1', '2.14.1' ]
+    }
+}