[7.17] Rework testing conventions gradle plugin (#87213) (#88422)

Backports the following commits to 7.17:
 - Rework testing conventions gradle plugin (#87213)

build-tools-internal/build.gradle

@@ -293,7 +293,6 @@ tasks.named('test').configure {
   useJUnitPlatform()
 }
 tasks.register("integTest", Test) {
-  inputs.dir(file("src/testKit")).withPropertyName("testkit dir").withPathSensitivity(PathSensitivity.RELATIVE)
   systemProperty 'test.version_under_test', version
   testClassesDirs = sourceSets.integTest.output.classesDirs
   classpath = sourceSets.integTest.runtimeClasspath

build-tools-internal/src/integTest/groovy/org/elasticsearch/gradle/fixtures/AbstractGradlePrecommitPluginFuncTest.groovy

@@ -0,0 +1,31 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * 2.0 and the Server Side Public License, v 1; you may not use this file except
+ * in compliance with, at your election, the Elastic License 2.0 or the Server
+ * Side Public License, v 1.
+ */
+
+package org.elasticsearch.gradle.fixtures
+
+import org.elasticsearch.gradle.internal.conventions.precommit.PrecommitPlugin
+
+abstract class AbstractGradlePrecommitPluginFuncTest extends AbstractJavaGradleFuncTest {
+
+    abstract <T extends PrecommitPlugin> Class<T> getPluginClassUnderTest();
+
+    def setup() {
+        buildFile << """
+        import ${getPluginClassUnderTest().getName()}
+        
+        plugins {
+          // bring in build-tools-internal onto the classpath
+          id 'elasticsearch.global-build-info'
+        }
+        // internally used plugins do not have a plugin id as they are
+        // not intended to be used directly from build scripts 
+        plugins.apply(${getPluginClassUnderTest().getSimpleName()})
+        
+        """
+    }
+}

build-tools-internal/src/integTest/groovy/org/elasticsearch/gradle/fixtures/LocalRepositoryFixture.groovy

@@ -0,0 +1,59 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * 2.0 and the Server Side Public License, v 1; you may not use this file except
+ * in compliance with, at your election, the Elastic License 2.0 or the Server
+ * Side Public License, v 1.
+ */
+
+package org.elasticsearch.gradle.fixtures
+
+import net.bytebuddy.ByteBuddy
+import net.bytebuddy.dynamic.DynamicType
+import org.junit.rules.ExternalResource
+import org.junit.rules.TemporaryFolder
+
+class LocalRepositoryFixture extends ExternalResource{
+
+    private TemporaryFolder temporaryFolder
+
+    LocalRepositoryFixture(TemporaryFolder temporaryFolder){
+        this.temporaryFolder = temporaryFolder
+    }
+
+    void generateJar(String group, String module, String version, String... clazzNames){
+        def baseGroupFolderPath = group.replace('.', '/')
+        def targetFolder = new File(repoDir, "${baseGroupFolderPath}/$module/$version")
+        targetFolder.mkdirs()
+
+        def jarFile = new File(targetFolder, "${module}-${version}.jar")
+        clazzNames.each {clazzName ->
+            DynamicType.Unloaded<?> dynamicType = new ByteBuddy().subclass(Object.class)
+                    .name(clazzName)
+                    .make()
+            if(jarFile.exists()) {
+                dynamicType.inject(jarFile);
+            }else {
+                dynamicType.toJar(jarFile);
+            }
+        }
+    }
+
+    void configureBuild(File buildFile) {
+        buildFile << """
+        repositories {
+          maven {
+            name = "local-test"
+            url = "${getRepoDir()}"
+            metadataSources {
+              artifact()
+            }
+          }
+        }  
+        """
+    }
+
+    File getRepoDir() {
+        new File(temporaryFolder.root, 'local-repo')
+    }
+}

build-tools-internal/src/integTest/groovy/org/elasticsearch/gradle/internal/precommit/LicenseHeadersPrecommitPluginFuncTest.groovy

@@ -8,19 +8,22 @@
 
 package org.elasticsearch.gradle.internal.precommit
 
-import org.elasticsearch.gradle.fixtures.AbstractGradleFuncTest
+import org.elasticsearch.gradle.fixtures.AbstractGradlePrecommitPluginFuncTest
+import org.elasticsearch.gradle.internal.conventions.precommit.LicenseHeadersPrecommitPlugin
+import org.elasticsearch.gradle.internal.conventions.precommit.PrecommitPlugin
 import org.gradle.testkit.runner.TaskOutcome
 
-class LicenseHeadersPrecommitPluginFuncTest extends AbstractGradleFuncTest {
+class LicenseHeadersPrecommitPluginFuncTest extends AbstractGradlePrecommitPluginFuncTest {
 
-    def "detects invalid files with invalid license header"() {
-        given:
+    Class<? extends PrecommitPlugin> pluginClassUnderTest = LicenseHeadersPrecommitPlugin.class
+
+    def setup() {
         buildFile << """
-        plugins {
-            id 'java'
-            id 'elasticsearch.internal-licenseheaders'
-        }
+        apply plugin:'java'
         """
+    }
+    def "detects invalid files with invalid license header"() {
+        given:
         dualLicensedFile()
         unknownSourceFile()
         unapprovedSourceFile()
@@ -39,11 +42,6 @@ class LicenseHeadersPrecommitPluginFuncTest extends AbstractGradleFuncTest {
     def "can filter source files"() {
         given:
         buildFile << """
-        plugins {
-            id 'java'
-            id 'elasticsearch.internal-licenseheaders'
-        }
-
         tasks.named("licenseHeaders").configure {
             excludes << 'org/acme/filtered/**/*'
         }
@@ -61,12 +59,6 @@ class LicenseHeadersPrecommitPluginFuncTest extends AbstractGradleFuncTest {
 
     def "supports sspl by convention"() {
         given:
-        buildFile << """
-        plugins {
-            id 'java'
-            id 'elasticsearch.internal-licenseheaders'
-        }
-        """
         dualLicensedFile()
 
         when:
@@ -79,11 +71,6 @@ class LicenseHeadersPrecommitPluginFuncTest extends AbstractGradleFuncTest {
     def "sspl default additional license can be overridden"() {
         given:
         buildFile << """
-        plugins {
-            id 'java'
-            id 'elasticsearch.internal-licenseheaders'
-        }
-
         tasks.named("licenseHeaders").configure {
             additionalLicense 'ELAST', 'Elastic License 2.0', '2.0; you may not use this file except in compliance with the Elastic License'
         }
@@ -173,4 +160,5 @@ class LicenseHeadersPrecommitPluginFuncTest extends AbstractGradleFuncTest {
         String normalizedPath = normalized(sourceFile.getPath())
         (normalizedPath.substring(normalizedPath.indexOf("src/main/java")) - "src/main/java/" - ("/" + sourceFile.getName())).replaceAll("/", ".")
     }
+
 }