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Ignore Kotlin compiler-generated DefaultImpls classes (#4696)
Resolves #4675. --------- Co-authored-by: Sam Brannen <104798+sbrannen@users.noreply.github.com>
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‎documentation/src/docs/asciidoc/release-notes/release-notes-5.13.3.adoc‎

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@@ -37,6 +37,8 @@ repository on GitHub.
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* Stop reporting discovery issues for composed annotation classes that are meta-annotated
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with `@Nested`.
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* Stop reporting discovery issues for `DefaultImpls` classes generated by the Kotlin
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compiler for interfaces with non-abstract test methods.
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[[release-notes-5.13.3-junit-jupiter-deprecations-and-breaking-changes]]
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==== Deprecations and Breaking Changes

‎junit-jupiter-api/junit-jupiter-api.gradle.kts‎

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@@ -18,6 +18,7 @@ dependencies {
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compileOnly(kotlin("stdlib"))
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testFixturesImplementation(libs.assertj)
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testFixturesImplementation(testFixtures(projects.junitPlatformCommons))
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osgiVerification(projects.junitJupiterEngine)
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osgiVerification(projects.junitPlatformLauncher)

‎junit-jupiter-api/src/testFixtures/java/org/junit/jupiter/api/extension/DisabledInEclipse.java‎

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@@ -0,0 +1,28 @@
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/*
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* Copyright 2015-2025 the original author or authors.
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*
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* All rights reserved. This program and the accompanying materials are
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* made available under the terms of the Eclipse Public License v2.0 which
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* accompanies this distribution and is available at
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*
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* https://www.eclipse.org/legal/epl-v20.html
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*/
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package org.junit.jupiter.api.extension;
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import java.lang.annotation.ElementType;
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import java.lang.annotation.Retention;
15+
import java.lang.annotation.RetentionPolicy;
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import java.lang.annotation.Target;
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import org.junit.jupiter.api.condition.DisabledIf;
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/**
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* @see org.junit.platform.commons.test.IdeUtils#runningInEclipse()
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*/
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@Retention(RetentionPolicy.RUNTIME)
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@Target({ ElementType.TYPE, ElementType.METHOD })
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@DisabledIf("org.junit.platform.commons.test.IdeUtils#runningInEclipse()")
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public @interface DisabledInEclipse {
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String value() default "";
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}

‎junit-jupiter-engine/src/main/java/org/junit/jupiter/engine/discovery/predicates/TestClassPredicates.java‎

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@@ -15,6 +15,7 @@
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import static org.junit.platform.commons.support.ModifierSupport.isAbstract;
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import static org.junit.platform.commons.support.ModifierSupport.isNotAbstract;
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import static org.junit.platform.commons.support.ModifierSupport.isNotPrivate;
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import static org.junit.platform.commons.util.KotlinReflectionUtils.isKotlinInterfaceDefaultImplsClass;
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import static org.junit.platform.commons.util.ReflectionUtils.isInnerClass;
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import static org.junit.platform.commons.util.ReflectionUtils.isMethodPresent;
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import static org.junit.platform.commons.util.ReflectionUtils.isNestedClassPresent;
@@ -74,7 +75,7 @@ public boolean looksLikeIntendedTestClass(Class<?> candidate) {
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}
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private boolean looksLikeIntendedTestClass(Class<?> candidate, Set<Class<?>> seen) {
77-
if (seen.add(candidate)) {
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if (seen.add(candidate) && !isKotlinInterfaceDefaultImplsClass(candidate)) {
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return this.isAnnotatedWithClassTemplate.test(candidate) //
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|| hasTestOrTestFactoryOrTestTemplateMethods(candidate) //
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|| hasNestedTests(candidate, seen);

‎junit-platform-commons/src/main/java/org/junit/platform/commons/util/KotlinReflectionUtils.java‎

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@@ -11,12 +11,16 @@
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package org.junit.platform.commons.util;
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import static org.apiguardian.api.API.Status.INTERNAL;
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import static org.junit.platform.commons.util.ReflectionUtils.EMPTY_CLASS_ARRAY;
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import static org.junit.platform.commons.util.ReflectionUtils.findMethod;
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import static org.junit.platform.commons.util.ReflectionUtils.isStatic;
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import static org.junit.platform.commons.util.ReflectionUtils.tryToLoadClass;
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import java.lang.annotation.Annotation;
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import java.lang.reflect.Method;
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import java.lang.reflect.Parameter;
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import java.lang.reflect.Type;
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import java.util.Arrays;
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import org.apiguardian.api.API;
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import org.jspecify.annotations.Nullable;
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/**
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* Internal Kotlin-specific reflection utilities
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*
28-
* @since 6.0
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* @since 5.13.3
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*/
30-
@API(status = INTERNAL, since = "6.0")
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@API(status = INTERNAL, since = "5.13.3")
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public class KotlinReflectionUtils {
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private static final @Nullable Class<? extends Annotation> kotlinMetadata;
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private static final @Nullable Class<?> kotlinCoroutineContinuation;
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private static final boolean kotlinReflectPresent;
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private static final boolean kotlinxCoroutinesPresent;
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public static final String DEFAULT_IMPLS_CLASS_NAME = "DefaultImpls";
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static {
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var metadata = tryToLoadKotlinMetadataClass();
@@ -56,6 +61,10 @@ private static Try<Class<? extends Annotation>> tryToLoadKotlinMetadataClass() {
5661
.andThenTry(it -> (Class<? extends Annotation>) it);
5762
}
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/**
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* @since 6.0
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*/
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@API(status = INTERNAL, since = "6.0")
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public static boolean isKotlinSuspendingFunction(Method method) {
6069
if (kotlinCoroutineContinuation != null && isKotlinType(method.getDeclaringClass())) {
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int parameterCount = method.getParameterCount();
@@ -65,6 +74,51 @@ public static boolean isKotlinSuspendingFunction(Method method) {
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return false;
6675
}
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/**
78+
* Determines whether the supplied class is a {@code DefaultImpls} class
79+
* generated by the Kotlin compiler.
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*
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* <p>See
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* <a href="https://kotlinlang.org/docs/interfaces.html#jvm-default-method-generation-for-interface-functions">Kotlin documentation</a>
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* for details.
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*
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* @since 5.13.3
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*/
87+
@API(status = INTERNAL, since = "5.13.3")
88+
public static boolean isKotlinInterfaceDefaultImplsClass(Class<?> clazz) {
89+
if (!isKotlinType(clazz) || !DEFAULT_IMPLS_CLASS_NAME.equals(clazz.getSimpleName()) || !isStatic(clazz)) {
90+
return false;
91+
}
92+
93+
Class<?> enclosingClass = clazz.getEnclosingClass();
94+
if (enclosingClass != null && enclosingClass.isInterface()) {
95+
return Arrays.stream(clazz.getDeclaredMethods()) //
96+
.anyMatch(method -> isCompilerGeneratedDefaultMethod(method, enclosingClass));
97+
}
98+
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return false;
100+
}
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private static boolean isCompilerGeneratedDefaultMethod(Method method, Class<?> enclosingClass) {
103+
if (isStatic(method) && method.getParameterCount() > 0) {
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var parameterTypes = method.getParameterTypes();
105+
if (parameterTypes[0] == enclosingClass) {
106+
var originalParameterTypes = copyWithoutFirst(parameterTypes);
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return findMethod(enclosingClass, method.getName(), originalParameterTypes).isPresent();
108+
}
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}
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return false;
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}
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private static Class<?>[] copyWithoutFirst(Class<?>[] values) {
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if (values.length == 1) {
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return EMPTY_CLASS_ARRAY;
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}
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var result = new Class<?>[values.length - 1];
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System.arraycopy(values, 1, result, 0, result.length);
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return result;
120+
}
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68122
private static boolean isKotlinType(Class<?> clazz) {
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return kotlinMetadata != null //
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&& clazz.getDeclaredAnnotation(kotlinMetadata) != null;

‎junit-platform-commons/src/main/java/org/junit/platform/commons/util/KotlinSuspendingFunctionUtils.java‎

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import static kotlin.reflect.jvm.ReflectJvmMapping.getJavaType;
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import static kotlinx.coroutines.BuildersKt.runBlocking;
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import static org.junit.platform.commons.util.ExceptionUtils.throwAsUncheckedException;
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import static org.junit.platform.commons.util.ReflectionUtils.EMPTY_CLASS_ARRAY;
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import static org.junit.platform.commons.util.ReflectionUtils.getUnderlyingCause;
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import java.lang.reflect.Method;
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static Class<?>[] getParameterTypes(Method method) {
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var parameterCount = method.getParameterCount();
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if (parameterCount == 1) {
63-
return new Class<?>[0];
64+
return EMPTY_CLASS_ARRAY;
6465
}
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return Arrays.stream(method.getParameterTypes()).limit(parameterCount - 1).toArray(Class<?>[]::new);
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}

‎junit-platform-commons/src/main/java/org/junit/platform/commons/util/ReflectionUtils.java‎

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// ++ => possessive quantifier
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private static final Pattern SOURCE_CODE_SYNTAX_ARRAY_PATTERN = Pattern.compile("^([^\\[\\]]+)((?>\\[\\])++)$");
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private static final Class<?>[] EMPTY_CLASS_ARRAY = new Class<?>[0];
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static final Class<?>[] EMPTY_CLASS_ARRAY = new Class<?>[0];
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private static final ClasspathScanner classpathScanner = ClasspathScannerLoader.getInstance();
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‎junit-vintage-engine/src/test/java/org/junit/vintage/engine/VintageTestEngineExecutionTests.java‎

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import org.assertj.core.api.Condition;
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import org.junit.AssumptionViolatedException;
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import org.junit.jupiter.api.Test;
45-
import org.junit.jupiter.api.condition.DisabledIf;
45+
import org.junit.jupiter.api.extension.DisabledInEclipse;
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import org.junit.platform.commons.util.ReflectionUtils;
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import org.junit.platform.engine.EngineExecutionListener;
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import org.junit.platform.engine.ExecutionRequest;
@@ -865,7 +865,7 @@ void executesJUnit4TestCaseWithRunnerWithDuplicateChangingChildDescriptions() {
865865
}
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@Test
868-
@DisabledIf("org.junit.platform.commons.test.IdeUtils#runningInEclipse()")
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@DisabledInEclipse
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void executesUnrolledSpockFeatureMethod() {
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// Load Groovy class via reflection to avoid compilation errors in Eclipse IDE.
871871
String testClassName = "org.junit.vintage.engine.samples.spock.SpockTestCaseWithUnrolledAndRegularFeatureMethods";
@@ -888,7 +888,7 @@ void executesUnrolledSpockFeatureMethod() {
888888
}
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@Test
891-
@DisabledIf("org.junit.platform.commons.test.IdeUtils#runningInEclipse()")
891+
@DisabledInEclipse
892892
void executesRegularSpockFeatureMethod() {
893893
// Load Groovy class via reflection to avoid compilation errors in Eclipse IDE.
894894
String testClassName = "org.junit.vintage.engine.samples.spock.SpockTestCaseWithUnrolledAndRegularFeatureMethods";

‎jupiter-tests/src/test/java/org/junit/jupiter/engine/discovery/DiscoveryTests.java‎

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import static org.assertj.core.api.Assertions.assertThat;
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import static org.junit.jupiter.api.Assertions.assertEquals;
1616
import static org.junit.jupiter.api.Assertions.fail;
17+
import static org.junit.jupiter.api.Assumptions.assumeFalse;
1718
import static org.junit.jupiter.api.Named.named;
1819
import static org.junit.jupiter.engine.discovery.JupiterUniqueIdBuilder.uniqueIdForTestTemplateMethod;
1920
import static org.junit.jupiter.params.provider.Arguments.argumentSet;
21+
import static org.junit.platform.commons.test.IdeUtils.runningInEclipse;
2022
import static org.junit.platform.commons.util.CollectionUtils.getOnlyElement;
2123
import static org.junit.platform.engine.discovery.ClassNameFilter.includeClassNamePatterns;
2224
import static org.junit.platform.engine.discovery.DiscoverySelectors.selectClass;
@@ -39,6 +41,7 @@
3941
import org.junit.jupiter.api.Test;
4042
import org.junit.jupiter.api.TestInfo;
4143
import org.junit.jupiter.api.TestTemplate;
44+
import org.junit.jupiter.api.extension.DisabledInEclipse;
4245
import org.junit.jupiter.engine.AbstractJupiterTestEngineTests;
4346
import org.junit.jupiter.engine.JupiterTestEngine;
4447
import org.junit.jupiter.engine.descriptor.ClassTestDescriptor;
@@ -47,6 +50,7 @@
4750
import org.junit.jupiter.params.ParameterizedTest;
4851
import org.junit.jupiter.params.provider.Arguments;
4952
import org.junit.jupiter.params.provider.MethodSource;
53+
import org.junit.jupiter.params.provider.ValueSource;
5054
import org.junit.platform.engine.DiscoveryIssue;
5155
import org.junit.platform.engine.DiscoveryIssue.Severity;
5256
import org.junit.platform.engine.TestDescriptor;
@@ -74,6 +78,50 @@ void doNotDiscoverAbstractTestClass() {
7478
assertEquals(0, engineDescriptor.getDescendants().size(), "# resolved test descriptors");
7579
}
7680

81+
@ParameterizedTest
82+
@ValueSource(strings = { "org.junit.jupiter.engine.discovery.DiscoveryTests$InterfaceTestCase",
83+
"org.junit.jupiter.engine.kotlin.KotlinInterfaceTestCase" })
84+
void doNotDiscoverTestInterface(String className) {
85+
86+
assumeFalse(runningInEclipse() && className.contains(".kotlin."));
87+
88+
LauncherDiscoveryRequest request = defaultRequest().selectors(selectClass(className)).build();
89+
TestDescriptor engineDescriptor = discoverTestsWithoutIssues(request);
90+
assertEquals(0, engineDescriptor.getDescendants().size(), "# resolved test descriptors");
91+
}
92+
93+
@Test
94+
@DisabledInEclipse
95+
void doNotDiscoverGeneratedKotlinDefaultImplsClass() {
96+
LauncherDiscoveryRequest request = defaultRequest() //
97+
.selectors(selectClass("org.junit.jupiter.engine.kotlin.KotlinInterfaceTestCase$DefaultImpls")) //
98+
.build();
99+
TestDescriptor engineDescriptor = discoverTestsWithoutIssues(request);
100+
assertEquals(0, engineDescriptor.getDescendants().size(), "# resolved test descriptors");
101+
}
102+
103+
@Test
104+
@DisabledInEclipse
105+
void discoverDeclaredKotlinDefaultImplsClass() {
106+
LauncherDiscoveryRequest request = defaultRequest().selectors(
107+
selectClass("org.junit.jupiter.engine.kotlin.KotlinDefaultImplsTestCase$DefaultImpls")).build();
108+
TestDescriptor engineDescriptor = discoverTestsWithoutIssues(request);
109+
assertEquals(2, engineDescriptor.getDescendants().size(), "# resolved test descriptors");
110+
}
111+
112+
@ParameterizedTest
113+
@ValueSource(strings = {
114+
"org.junit.jupiter.engine.discovery.DiscoveryTests$ConcreteImplementationOfInterfaceTestCase",
115+
"org.junit.jupiter.engine.kotlin.KotlinInterfaceImplementationTestCase" })
116+
void discoverTestClassInheritingTestsFromInterface(String className) {
117+
118+
assumeFalse(runningInEclipse() && className.contains(".kotlin."));
119+
120+
LauncherDiscoveryRequest request = defaultRequest().selectors(selectClass(className)).build();
121+
TestDescriptor engineDescriptor = discoverTestsWithoutIssues(request);
122+
assertEquals(2, engineDescriptor.getDescendants().size(), "# resolved test descriptors");
123+
}
124+
77125
@Test
78126
void discoverMethodByUniqueId() {
79127
LauncherDiscoveryRequest request = defaultRequest().selectors(
@@ -524,4 +572,13 @@ void test() {
524572
}
525573
}
526574

575+
interface InterfaceTestCase {
576+
@Test
577+
default void test() {
578+
}
579+
}
580+
581+
static class ConcreteImplementationOfInterfaceTestCase implements InterfaceTestCase {
582+
}
583+
527584
}

‎jupiter-tests/src/test/java/org/junit/jupiter/engine/extension/TimeoutInvocationFactoryTests.java‎

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@@ -18,7 +18,7 @@
1818
import org.junit.jupiter.api.DisplayName;
1919
import org.junit.jupiter.api.Test;
2020
import org.junit.jupiter.api.Timeout.ThreadMode;
21-
import org.junit.jupiter.api.condition.DisabledIf;
21+
import org.junit.jupiter.api.extension.DisabledInEclipse;
2222
import org.junit.jupiter.api.extension.ExtendWith;
2323
import org.junit.jupiter.api.extension.ExtensionContext.Store;
2424
import org.junit.jupiter.api.extension.InvocationInterceptor.Invocation;
@@ -35,9 +35,7 @@
3535
// Mockito cannot mock this class: class org.junit.jupiter.engine.execution.NamespaceAwareStore.
3636
// You are seeing this disclaimer because Mockito is configured to create inlined mocks.
3737
// Byte Buddy could not instrument all classes within the mock's type hierarchy.
38-
@DisabledIf(//
39-
value = "org.junit.platform.commons.test.IdeUtils#runningInEclipse()", //
40-
disabledReason = "Mockito cannot create a spy for NamespaceAwareStore using the inline MockMaker in Eclipse IDE")
38+
@DisabledInEclipse("Mockito cannot create a spy for NamespaceAwareStore using the inline MockMaker in Eclipse IDE")
4139
@DisplayName("TimeoutInvocationFactory")
4240
@ExtendWith(MockitoExtension.class)
4341
class TimeoutInvocationFactoryTests {

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