diff --git a/build.gradle b/build.gradle
index f5dc92e95a..19d2a21160 100644
--- a/build.gradle
+++ b/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"
diff --git a/buildSrc/src/main/groovy/org/springframework/build/gradle/TestSourceSetDependenciesPlugin.groovy b/buildSrc/src/main/groovy/org/springframework/build/gradle/TestSourceSetDependenciesPlugin.groovy
new file mode 100644
index 0000000000..1e5cffcc7b
--- /dev/null
+++ b/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)
+			}
+		}
+	}
+
+}
diff --git a/buildSrc/src/main/resources/META-INF/gradle-plugins/test-source-set-dependencies.properties b/buildSrc/src/main/resources/META-INF/gradle-plugins/test-source-set-dependencies.properties
new file mode 100644
index 0000000000..f5df417ad2
--- /dev/null
+++ b/buildSrc/src/main/resources/META-INF/gradle-plugins/test-source-set-dependencies.properties
@@ -0,0 +1 @@
+implementation-class=org.springframework.build.gradle.TestSourceSetDependenciesPlugin