Develop a gradle plugin to add test dependencies

Develop a gradle plugin to automatically update testCompile dependencies
to include the test source sets of project dependencies.

Allows the gradle build to more closely mirror the way that tests run
inside eclipse.

build.gradle

@@ -28,6 +28,7 @@ configure(allprojects) {
 	apply plugin: "java"
 	apply plugin: "propdeps-eclipse"
 	apply plugin: "propdeps-idea"
+	apply plugin: "test-source-set-dependencies"
 	apply from: "${gradleScriptDir}/ide.gradle"
 
 	group = "org.springframework"

buildSrc/src/main/groovy/org/springframework/build/gradle/TestSourceSetDependenciesPlugin.groovy

@@ -0,0 +1,51 @@
+/*
+ * Copyright 2002-2012 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.build.gradle
+
+import org.gradle.api.Plugin
+import org.gradle.api.Project
+import org.gradle.api.artifacts.Configuration;
+import org.gradle.api.artifacts.ProjectDependency;
+
+
+/**
+ * Gradle plugin that automatically updates testCompile dependencies to include
+ * the test source sets of project dependencies.
+ *
+ * @author Phillip Webb
+ */
+class TestSourceSetDependenciesPlugin implements Plugin<Project> {
+
+	@Override
+	public void apply(Project project) {
+		project.afterEvaluate {
+			Set<ProjectDependency> projectDependencies = new LinkedHashSet<>()
+			for(def configurationName in ["compile", "optional", "provided"]) {
+				Configuration configuration = project.getConfigurations().findByName(configurationName)
+				if(configuration) {
+					projectDependencies.addAll(
+						configuration.dependencies.findAll { it instanceof ProjectDependency }
+					)
+				}
+			}
+			projectDependencies.each {
+				project.dependencies.add("testCompile", it.dependencyProject.sourceSets.test.output)
+			}
+		}
+	}
+
+}

buildSrc/src/main/resources/META-INF/gradle-plugins/test-source-set-dependencies.properties

@@ -0,0 +1 @@
+implementation-class=org.springframework.build.gradle.TestSourceSetDependenciesPlugin