Compile tests using Java 10

build.gradle

@@ -121,10 +121,16 @@ allprojects { subproj ->
 
 	subproj.afterEvaluate { evaluatedProject ->
 		evaluatedProject.tasks.withType(JavaCompile) {
+			options.encoding = 'UTF-8'
+		}
+		evaluatedProject.tasks.getByName('compileJava') {
 			sourceCompatibility = javacRelease
 			targetCompatibility = javacRelease // needed by asm
 			options.compilerArgs += ['--release', javacRelease]
-			options.encoding = 'UTF-8'
+		}
+		evaluatedProject.tasks.getByName('compileTestJava') {
+			sourceCompatibility = 10
+			targetCompatibility = 10
 		}
 	}
 
@@ -153,6 +159,7 @@ allprojects { subproj ->
 
 	// See: https://docs.oracle.com/javase/9/tools/javac.htm#JSWOR627
 	compileTestJava.options.compilerArgs += [
+		'-parameters',
 		'-Xlint:cast',
 		'-Xlint:classfile',
 		'-Xlint:deprecation',
@@ -173,11 +180,6 @@ allprojects { subproj ->
 		'-Xlint:-overrides'
 	]
 
-	compileTestJava {
-		options.encoding = 'UTF-8'
-		options.compilerArgs += '-parameters'
-	}
-
 	tasks.withType(org.jetbrains.kotlin.gradle.tasks.KotlinCompile) {
 		kotlinOptions {
 			jvmTarget = '1.8'

documentation/src/test/java/example/DynamicTestsDemo.java

@@ -116,7 +116,7 @@ Stream<DynamicTest> generateRandomNumberOfTests() {
 
 		// Generates random positive integers between 0 and 100 until
 		// a number evenly divisible by 7 is encountered.
-		Iterator<Integer> inputGenerator = new Iterator<Integer>() {
+		Iterator<Integer> inputGenerator = new Iterator<>() {
 
 			Random random = new Random();
 			// end::user_guide[]

gradle.properties

@@ -14,7 +14,7 @@ vintageBaseline     = 5.2.0
 
 # --release release
 # Compiles against the public, supported and documented API for a specific VM version.
-# Supported release targets are 6, 7, 8, and 9.
+# Supported release targets are 6, 7, 8, 9, 10, and 11.
 # Note that if --release is added then -target and -source are ignored.
 javacRelease = 8
 

platform-tests/src/test/java/org/junit/platform/commons/util/CollectionUtilsTests.java

@@ -139,7 +139,7 @@ void toStreamWithLongStream() {
 	@SuppressWarnings({ "unchecked", "serial" })
 	void toStreamWithCollection() {
 		AtomicBoolean collectionStreamClosed = new AtomicBoolean(false);
-		Collection<String> input = new ArrayList<String>() {
+		Collection<String> input = new ArrayList<>() {
 
 			{
 				add("foo");
@@ -164,7 +164,7 @@ public Stream<String> stream() {
 	@SuppressWarnings("unchecked")
 	void toStreamWithIterable() {
 
-		Iterable<String> input = new Iterable<String>() {
+		Iterable<String> input = new Iterable<>() {
 
 			@Override
 			public Iterator<String> iterator() {

platform-tests/src/test/java/org/junit/platform/commons/util/ToStringBuilderTests.java

@@ -41,7 +41,7 @@ void withNullClass() {
 
 	@Test
 	void appendWithIllegalName() {
-		ToStringBuilder builder = new ToStringBuilder("");
+		var builder = new ToStringBuilder("");
 
 		assertThrows(PreconditionViolationException.class, () -> builder.append(null, ""));
 		assertThrows(PreconditionViolationException.class, () -> builder.append("", ""));
@@ -129,7 +129,7 @@ void withPrimitiveDoubleArrayField() {
 	@SuppressWarnings("serial")
 	void withMapField() {
 		// @formatter:off
-		Map<String,Object> map = new LinkedHashMap<String,Object>() {{
+		Map<String,Object> map = new LinkedHashMap<>() {{
 			put("foo", 42);
 			put("bar", "enigma");
 		}};
@@ -140,7 +140,7 @@ void withMapField() {
 
 	@Test
 	void withDemoImplementation() {
-		RoleModel roleModel = new RoleModel("Dilbert", 42);
+		var roleModel = new RoleModel("Dilbert", 42);
 		assertEquals("RoleModel [name = 'Dilbert', age = 42]", roleModel.toString());
 	}
 
@@ -153,7 +153,6 @@ static class RoleModel {
 		}
 
 		RoleModel(String name, int age) {
-			super();
 			this.name = name;
 			this.age = age;
 		}