Fixes #1967: Correctly handle mocks with limited life-cycle in listeners.

settings.gradle.kts

@@ -10,6 +10,7 @@ include("deprecatedPluginsTest",
     "android",
     "junit-jupiter",
     "junitJupiterExtensionTest",
+    "junitJupiterInlineMockMakerExtensionTest",
     "module-test",
     "memory-test",
     "errorprone",
@@ -18,7 +19,7 @@ include("deprecatedPluginsTest",
 
 rootProject.name = "mockito"
 
-val koltinBuildScriptProject = hashSetOf("junitJupiterExtensionTest")
+val koltinBuildScriptProject = hashSetOf("junitJupiterExtensionTest", "junitJupiterInlineMockMakerExtensionTest")
 
 fun buildFileExtensionFor(projectName: String) =
     if (projectName in koltinBuildScriptProject) ".gradle.kts" else ".gradle"

src/main/java/org/mockito/MockedStatic.java

@@ -63,6 +63,16 @@ default void verify(Verification verification) {
      */
     void verifyNoInteractions();
 
+    /**
+     * Checks if this mock is closed.
+     *
+     * @return {@code true} if this mock is closed.
+     */
+    boolean isClosed();
+
+    /**
+     * Releases this static mock and throws a {@link org.mockito.exceptions.base.MockitoException} if closed already.
+     */
     @Override
     void close();
 

src/main/java/org/mockito/Mockito.java

@@ -2058,6 +2058,12 @@ public static <T> T spy(Class<T> classToSpy) {
      * The returned object's {@link MockedStatic#close()} method must be called upon completing the
      * test or the mock will remain active on the current thread.
      * <p>
+     * <b>Note</b>: We recommend against mocking static methods of classes in the standard library or
+     * classes used by custom class loaders used to executed the block with the mocked class. A mock
+     * maker might forbid mocking static methods of know classes that are known to cause problems.
+     * Also, if a static method is a JVM-intrinsic, it cannot typically be mocked even if not
+     * explicitly forbidden.
+     * <p>
      * See examples in javadoc for {@link Mockito} class
      *
      * @param classToMock class or interface of which static mocks should be mocked.
@@ -2074,6 +2080,12 @@ public static <T> MockedStatic<T> mockStatic(Class<T> classToMock) {
      * The returned object's {@link MockedStatic#close()} method must be called upon completing the
      * test or the mock will remain active on the current thread.
      * <p>
+     * <b>Note</b>: We recommend against mocking static methods of classes in the standard library or
+     * classes used by custom class loaders used to executed the block with the mocked class. A mock
+     * maker might forbid mocking static methods of know classes that are known to cause problems.
+     * Also, if a static method is a JVM-intrinsic, it cannot typically be mocked even if not
+     * explicitly forbidden.
+     * <p>
      * See examples in javadoc for {@link Mockito} class
      *
      * @param classToMock class or interface of which static mocks should be mocked.
@@ -2091,6 +2103,12 @@ public static <T> MockedStatic<T> mockStatic(Class<T> classToMock, Answer defaul
      * The returned object's {@link MockedStatic#close()} method must be called upon completing the
      * test or the mock will remain active on the current thread.
      * <p>
+     * <b>Note</b>: We recommend against mocking static methods of classes in the standard library or
+     * classes used by custom class loaders used to executed the block with the mocked class. A mock
+     * maker might forbid mocking static methods of know classes that are known to cause problems.
+     * Also, if a static method is a JVM-intrinsic, it cannot typically be mocked even if not
+     * explicitly forbidden.
+     * <p>
      * See examples in javadoc for {@link Mockito} class
      *
      * @param classToMock class or interface of which static mocks should be mocked.
@@ -2108,6 +2126,12 @@ public static <T> MockedStatic<T> mockStatic(Class<T> classToMock, String name)
      * The returned object's {@link MockedStatic#close()} method must be called upon completing the
      * test or the mock will remain active on the current thread.
      * <p>
+     * <b>Note</b>: We recommend against mocking static methods of classes in the standard library or
+     * classes used by custom class loaders used to executed the block with the mocked class. A mock
+     * maker might forbid mocking static methods of know classes that are known to cause problems.
+     * Also, if a static method is a JVM-intrinsic, it cannot typically be mocked even if not
+     * explicitly forbidden.
+     * <p>
      * See examples in javadoc for {@link Mockito} class
      *
      * @param classToMock class or interface of which static mocks should be mocked.

src/main/java/org/mockito/internal/MockedStaticImpl.java

@@ -157,6 +157,11 @@ public void verifyNoInteractions() {
         noInteractions().verify(data);
     }
 
+    @Override
+    public boolean isClosed() {
+        return closed;
+    }
+
     @Override
     public void close() {
         assertNotClosed();
@@ -181,4 +186,9 @@ private void assertNotClosed() {
                             "is already resolved and cannot longer be used"));
         }
     }
+
+    @Override
+    public String toString() {
+        return "static mock for " + control.getType().getTypeName();
+    }
 }

src/main/java/org/mockito/internal/configuration/MockAnnotationProcessor.java

@@ -58,21 +58,25 @@ public static Object processAnnotationForMock(
         }
     }
 
-    private static Class<?> inferStaticMock(Type type, String name) {
+    static Class<?> inferStaticMock(Type type, String name) {
         if (type instanceof ParameterizedType) {
             ParameterizedType parameterizedType = (ParameterizedType) type;
-            return (Class<?>) parameterizedType.getRawType();
-        } else {
-            throw new MockitoException(
-                    join(
-                            "Mockito cannot infer a static mock from a raw type for " + name,
-                            "",
-                            "Instead of @Mock MockedStatic you need to specify a parameterized type",
-                            "For example, if you would like to mock static methods of Sample.class, specify",
-                            "",
-                            "@Mock MockedStatic<Sample>",
-                            "",
-                            "as the type parameter"));
+            Type[] arguments = parameterizedType.getActualTypeArguments();
+            if (arguments.length == 1) {
+                if (arguments[0] instanceof Class<?>) {
+                    return (Class<?>) arguments[0];
+                }
+            }
         }
+        throw new MockitoException(
+                join(
+                        "Mockito cannot infer a static mock from a raw type for " + name,
+                        "",
+                        "Instead of @Mock MockedStatic you need to specify a parameterized type",
+                        "For example, if you would like to mock static methods of Sample.class, specify",
+                        "",
+                        "@Mock MockedStatic<Sample>",
+                        "",
+                        "as the type parameter. If the type is parameterized, it should be specified as raw type."));
     }
 }

src/main/java/org/mockito/internal/creation/bytebuddy/InlineByteBuddyMockMaker.java

@@ -382,6 +382,13 @@ public <T> StaticMockControl<T> createStaticMock(
             throw new MockitoException(
                     "It is not possible to mock static methods of ConcurrentHashMap "
                             + "to avoid infinitive loops within Mockito's implementation of static mock handling");
+        } else if (type == Thread.class
+                || type == System.class
+                || ClassLoader.class.isAssignableFrom(type)) {
+            throw new MockitoException(
+                    "It is not possible to mock static methods of "
+                            + type.getTypeName()
+                            + "to avoid interfering with the class loading mechanism");
         }
 
         bytecodeGenerator.mockClassStatic(type);

src/main/java/org/mockito/internal/framework/DefaultMockitoSession.java

@@ -43,7 +43,11 @@ public DefaultMockitoSession(
                 closeables.add(MockitoAnnotations.openMocks(testClassInstance));
             }
         } catch (RuntimeException e) {
-            release();
+            try {
+                release();
+            } catch (Throwable t) {
+                e.addSuppressed(t);
+            }
 
             // clean up in case 'openMocks' fails
             listener.setListenerDirty();
@@ -58,38 +62,38 @@ public void setStrictness(Strictness strictness) {
 
     @Override
     public void finishMocking() {
-        release();
-
         finishMocking(null);
     }
 
     @Override
     public void finishMocking(final Throwable failure) {
-        release();
-
-        // Cleaning up the state, we no longer need the listener hooked up
-        // The listener implements MockCreationListener and at this point
-        // we no longer need to listen on mock creation events. We are wrapping up the session
-        Mockito.framework().removeListener(listener);
-
-        // Emit test finished event so that validation such as strict stubbing can take place
-        listener.testFinished(
-                new TestFinishedEvent() {
-                    @Override
-                    public Throwable getFailure() {
-                        return failure;
-                    }
-
-                    @Override
-                    public String getTestName() {
-                        return name;
-                    }
-                });
-
-        // Validate only when there is no test failure to avoid reporting multiple problems
-        if (failure == null) {
-            // Finally, validate user's misuse of Mockito framework.
-            Mockito.validateMockitoUsage();
+        try {
+            // Cleaning up the state, we no longer need the listener hooked up
+            // The listener implements MockCreationListener and at this point
+            // we no longer need to listen on mock creation events. We are wrapping up the session
+            Mockito.framework().removeListener(listener);
+
+            // Emit test finished event so that validation such as strict stubbing can take place
+            listener.testFinished(
+                    new TestFinishedEvent() {
+                        @Override
+                        public Throwable getFailure() {
+                            return failure;
+                        }
+
+                        @Override
+                        public String getTestName() {
+                            return name;
+                        }
+                    });
+
+            // Validate only when there is no test failure to avoid reporting multiple problems
+            if (failure == null) {
+                // Finally, validate user's misuse of Mockito framework.
+                Mockito.validateMockitoUsage();
+            }
+        } finally {
+            release();
         }
     }
 
@@ -98,7 +102,7 @@ private void release() {
             try {
                 closeable.close();
             } catch (Exception e) {
-                throw new MockitoException("Failed to release mocks", e);
+                throw new MockitoException("Failed to release " + closeable, e);
             }
         }
     }

src/main/java/org/mockito/internal/invocation/finder/AllInvocationsFinder.java

@@ -42,6 +42,12 @@ public static List<Invocation> find(Iterable<?> mocks) {
     public static Set<Stubbing> findStubbings(Iterable<?> mocks) {
         Set<Stubbing> stubbings = new TreeSet<Stubbing>(new StubbingComparator());
         for (Object mock : mocks) {
+            // TODO due to the limited scope of static mocks they cannot be processed
+            //  it would rather be required to trigger this stubbing control upon releasing
+            //  the static mock.
+            if (mock instanceof Class<?>) {
+                continue;
+            }
             Collection<? extends Stubbing> fromSingleMock =
                     new DefaultMockingDetails(mock).getStubbings();
             stubbings.addAll(fromSingleMock);

src/test/java/org/mockito/internal/configuration/MockAnnotationProcessorTest.java

@@ -0,0 +1,49 @@
+/*
+ * Copyright (c) 2020 Mockito contributors
+ * This program is made available under the terms of the MIT License.
+ */
+package org.mockito.internal.configuration;
+
+import java.util.List;
+
+import org.junit.Test;
+import org.mockito.MockedStatic;
+import org.mockito.exceptions.base.MockitoException;
+
+import static org.assertj.core.api.Assertions.*;
+
+public class MockAnnotationProcessorTest {
+
+    @SuppressWarnings("unused")
+    private MockedStatic<Void> nonGeneric;
+
+    @SuppressWarnings("unused")
+    private MockedStatic<List<?>> generic;
+
+    @SuppressWarnings({"raw", "unused"})
+    private MockedStatic raw;
+
+    @Test
+    public void testNonGeneric() throws Exception {
+        Class<?> type =
+                MockAnnotationProcessor.inferStaticMock(
+                        MockAnnotationProcessorTest.class
+                                .getDeclaredField("nonGeneric")
+                                .getGenericType(),
+                        "nonGeneric");
+        assertThat(type).isEqualTo(Void.class);
+    }
+
+    @Test(expected = MockitoException.class)
+    public void testGeneric() throws Exception {
+        MockAnnotationProcessor.inferStaticMock(
+                MockAnnotationProcessorTest.class.getDeclaredField("generic").getGenericType(),
+                "generic");
+    }
+
+    @Test(expected = MockitoException.class)
+    public void testRaw() throws Exception {
+        MockAnnotationProcessor.inferStaticMock(
+                MockAnnotationProcessorTest.class.getDeclaredField("raw").getGenericType(), "raw");
+    }
+}

subprojects/inline/src/test/java/org/mockitoinline/StaticMockTest.java

@@ -11,15 +11,21 @@
 
 import java.util.concurrent.atomic.AtomicReference;
 
+import org.junit.Rule;
 import org.junit.Test;
 import org.mockito.MockedStatic;
 import org.mockito.Mockito;
 import org.mockito.exceptions.base.MockitoException;
 import org.mockito.exceptions.verification.NoInteractionsWanted;
 import org.mockito.exceptions.verification.WantedButNotInvoked;
+import org.mockito.junit.MockitoJUnit;
+import org.mockito.junit.MockitoRule;
 
 public final class StaticMockTest {
 
+    @Rule // Adding rule to assert properly managed life-cycle for static mocks
+    public MockitoRule mockitoRule = MockitoJUnit.rule();
+
     @Test
     public void testStaticMockSimple() {
         assertEquals("foo", Dummy.foo());

subprojects/junitJupiterInlineMockMakerExtensionTest/junitJupiterInlineMockMakerExtensionTest.gradle.kts

@@ -0,0 +1,25 @@
+apply(from = "$rootDir/gradle/dependencies.gradle")
+
+plugins {
+    java
+}
+
+description = "End-to-end tests for automatic registration of MockitoExtension with the inline mock maker."
+
+dependencies {
+    testCompile(project(":junit-jupiter"))
+    testCompile(library("assertj"))
+    testCompile(library("junitPlatformLauncher"))
+    testCompile(library("junitJupiterApi"))
+    testRuntime(library("junitJupiterEngine"))
+}
+
+tasks.named<Test>("test") {
+    useJUnitPlatform()
+}
+
+val Project.libraries
+    get() = rootProject.extra["libraries"] as Map<String, Any>
+
+fun Project.library(name: String) =
+    libraries[name]!!

subprojects/junitJupiterInlineMockMakerExtensionTest/src/test/java/org/mockitousage/NoExtendsTest.java

@@ -0,0 +1,25 @@
+/*
+ * Copyright (c) 2018 Mockito contributors
+ * This program is made available under the terms of the MIT License.
+ */
+package org.mockitousage;
+
+import java.util.UUID;
+
+import org.junit.jupiter.api.Test;
+import org.mockito.Mock;
+import org.mockito.MockedStatic;
+
+import static org.assertj.core.api.Assertions.*;
+
+class NoExtendsTest {
+
+    @Mock
+    private MockedStatic<UUID> mock;
+
+    @Test
+    void runs() {
+        mock.when(UUID::randomUUID).thenReturn(new UUID(123, 456));
+        assertThat(UUID.randomUUID()).isEqualTo(new UUID(123, 456));
+    }
+}

subprojects/junitJupiterInlineMockMakerExtensionTest/src/test/resources/META-INF/services/org.junit.jupiter.api.extension.Extension

@@ -0,0 +1 @@
+org.mockito.junit.jupiter.MockitoExtension

subprojects/junitJupiterInlineMockMakerExtensionTest/src/test/resources/junit-platform.properties

@@ -0,0 +1 @@
+junit.jupiter.extensions.autodetection.enabled = true

subprojects/junitJupiterInlineMockMakerExtensionTest/src/test/resources/mockito-extensions/org.mockito.plugins.MockMaker

@@ -0,0 +1 @@
+mock-maker-inline