Pre release 3.5.0

src/main/java/org/mockito/MockedConstruction.java

@@ -0,0 +1,40 @@
+/*
+ * Copyright (c) 2007 Mockito contributors
+ * This program is made available under the terms of the MIT License.
+ */
+package org.mockito;
+
+import java.lang.reflect.Constructor;
+import java.util.List;
+
+/**
+ * Represents a mock of any object construction of the represented type. Within the scope of the
+ * mocked construction, the invocation of any interceptor will generate a mock which will be
+ * prepared as specified when generating this scope. The mock can also be received via this
+ * instance.
+ * <p>
+ * If the {@link Mock} annotation is used on fields or method parameters of this type, a mocked
+ * construction is created instead of a regular mock. The mocked construction is activated and
+ * released upon completing any relevant test.
+ *
+ * @param <T> The type for which the construction is being mocked.
+ */
+@Incubating
+public interface MockedConstruction<T> extends ScopedMock {
+
+    List<T> constructed();
+
+    interface Context {
+
+        int getCount();
+
+        Constructor<?> constructor();
+
+        List<?> arguments();
+    }
+
+    interface MockInitializer<T> {
+
+        void prepare(T mock, Context context) throws Throwable;
+    }
+}

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

@@ -24,7 +24,7 @@
  * @param <T> The type being mocked.
  */
 @Incubating
-public interface MockedStatic<T> extends AutoCloseable {
+public interface MockedStatic<T> extends ScopedMock {
 
     /**
      * See {@link Mockito#when(Object)}.
@@ -63,24 +63,6 @@ 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();
-
-    /**
-     * Releases this static mock and is non-operational if already released.
-     */
-    void closeOnDemand();
-
     interface Verification {
 
         void apply() throws Throwable;

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

@@ -28,18 +28,10 @@
 import org.mockito.quality.Strictness;
 import org.mockito.session.MockitoSessionBuilder;
 import org.mockito.session.MockitoSessionLogger;
-import org.mockito.stubbing.Answer;
-import org.mockito.stubbing.Answer1;
-import org.mockito.stubbing.LenientStubber;
-import org.mockito.stubbing.OngoingStubbing;
-import org.mockito.stubbing.Stubber;
-import org.mockito.stubbing.Stubbing;
-import org.mockito.stubbing.VoidAnswer1;
-import org.mockito.verification.After;
-import org.mockito.verification.Timeout;
-import org.mockito.verification.VerificationAfterDelay;
-import org.mockito.verification.VerificationMode;
-import org.mockito.verification.VerificationWithTimeout;
+import org.mockito.stubbing.*;
+import org.mockito.verification.*;
+
+import java.util.function.Function;
 
 /**
  * <p align="left"><img src="logo.png" srcset="logo@2x.png 2x" alt="Mockito logo"/></p>
@@ -106,6 +98,7 @@
  *      <a href="#46">46. New <code>Mockito.lenient()</code> and <code>MockSettings.lenient()</code> methods (Since 2.20.0)</a><br/>
  *      <a href="#47">47. New API for clearing mock state in inline mocking (Since 2.25.0)</a><br/>
  *      <a href="#48">48. New API for mocking static methods (Since 3.4.0)</a><br/>
+ *      <a href="#49">49. New API for mocking object construction (Since 3.5.0)</a><br/>
  * </b>
  *
  * <h3 id="0">0. <a class="meaningful_link" href="#mockito2" name="mockito2">Migrating to Mockito 2</a></h3>
@@ -1565,9 +1558,32 @@
  * assertEquals("foo", Foo.method());
  * </code></pre>
  *
- * Due to the defined scope of the static mock, it returns to its original behvior once the scope is released. To define mock
+ * Due to the defined scope of the static mock, it returns to its original behavior once the scope is released. To define mock
  * behavior and to verify static method invocations, use the <code>MockedStatic</code> that is returned.
  * <p>
+ *
+ * <h3 id="49">49. <a class="meaningful_link" href="#mocked_construction" name="mocked_construction">Mocking object construction</a> (since 3.5.0)</h3>
+ *
+ * When using the <a href="#0.2">inline mock maker</a>, it is possible to generate mocks on constructor invocations within the current
+ * thread and a user-defined scope. This way, Mockito assures that concurrently and sequentially running tests do not interfere.
+ *
+ * To make sure a constructor mocks remain temporary, it is recommended to define the scope within a try-with-resources construct.
+ * In the following example, the <code>Foo</code> type's construction would generate a mock:
+ *
+ * <pre class="code"><code class="java">
+ * assertEquals("foo", Foo.method());
+ * try (MockedConstruction<Foo> mocked = mockConstruction(Foo.class)) {
+ * Foo foo = new Foo();
+ * when(foo.method()).thenReturn("bar");
+ * assertEquals("bar", foo.method());
+ * verify(foo).method();
+ * }
+ * assertEquals("foo", foo.method());
+ * </code></pre>
+ *
+ * Due to the defined scope of the mocked construction, object construction returns to its original behavior once the scope is
+ * released. To define mock behavior and to verify static method invocations, use the <code>MockedConstruction</code> that is returned.
+ * <p>
  */
 @SuppressWarnings("unchecked")
 public class Mockito extends ArgumentMatchers {
@@ -2144,6 +2160,152 @@ public static <T> MockedStatic<T> mockStatic(Class<T> classToMock, MockSettings
         return MOCKITO_CORE.mockStatic(classToMock, mockSettings);
     }
 
+    /**
+     * Creates a thread-local mock controller for all constructions of the given class.
+     * The returned object's {@link MockedConstruction#close()} method must be called upon completing the
+     * test or the mock will remain active on the current thread.
+     * <p>
+     * See examples in javadoc for {@link Mockito} class
+     *
+     * @param classToMock non-abstract class of which constructions should be mocked.
+     * @param defaultAnswer the default answer for the first created mock.
+     * @param additionalAnswers the default answer for all additional mocks. For any access mocks, the
+     *                         last answer is used. If this array is empty, the {@code defaultAnswer} is used.
+     * @return mock controller
+     */
+    @Incubating
+    @CheckReturnValue
+    public static <T> MockedConstruction<T> mockConstructionWithAnswer(
+            Class<T> classToMock, Answer defaultAnswer, Answer... additionalAnswers) {
+        return mockConstruction(
+                classToMock,
+                context -> {
+                    if (context.getCount() == 1 || additionalAnswers.length == 0) {
+                        return withSettings().defaultAnswer(defaultAnswer);
+                    } else if (context.getCount() >= additionalAnswers.length) {
+                        return withSettings()
+                                .defaultAnswer(additionalAnswers[additionalAnswers.length - 1]);
+                    } else {
+                        return withSettings()
+                                .defaultAnswer(additionalAnswers[context.getCount() - 2]);
+                    }
+                },
+                (mock, context) -> {});
+    }
+
+    /**
+     * Creates a thread-local mock controller for all constructions of the given class.
+     * The returned object's {@link MockedConstruction#close()} method must be called upon completing the
+     * test or the mock will remain active on the current thread.
+     * <p>
+     * See examples in javadoc for {@link Mockito} class
+     *
+     * @param classToMock non-abstract class of which constructions should be mocked.
+     * @return mock controller
+     */
+    @Incubating
+    @CheckReturnValue
+    public static <T> MockedConstruction<T> mockConstruction(Class<T> classToMock) {
+        return mockConstruction(classToMock, index -> withSettings(), (mock, context) -> {});
+    }
+
+    /**
+     * Creates a thread-local mock controller for all constructions of the given class.
+     * The returned object's {@link MockedConstruction#close()} method must be called upon completing the
+     * test or the mock will remain active on the current thread.
+     * <p>
+     * See examples in javadoc for {@link Mockito} class
+     *
+     * @param classToMock non-abstract class of which constructions should be mocked.
+     * @param mockInitializer a callback to prepare a mock's methods after its instantiation.
+     * @return mock controller
+     */
+    @Incubating
+    @CheckReturnValue
+    public static <T> MockedConstruction<T> mockConstruction(
+            Class<T> classToMock, MockedConstruction.MockInitializer<T> mockInitializer) {
+        return mockConstruction(classToMock, withSettings(), mockInitializer);
+    }
+
+    /**
+     * Creates a thread-local mock controller for all constructions of the given class.
+     * The returned object's {@link MockedConstruction#close()} method must be called upon completing the
+     * test or the mock will remain active on the current thread.
+     * <p>
+     * See examples in javadoc for {@link Mockito} class
+     *
+     * @param classToMock non-abstract class of which constructions should be mocked.
+     * @param mockSettings the mock settings to use.
+     * @return mock controller
+     */
+    @Incubating
+    @CheckReturnValue
+    public static <T> MockedConstruction<T> mockConstruction(
+            Class<T> classToMock, MockSettings mockSettings) {
+        return mockConstruction(classToMock, context -> mockSettings);
+    }
+
+    /**
+     * Creates a thread-local mock controller for all constructions of the given class.
+     * The returned object's {@link MockedConstruction#close()} method must be called upon completing the
+     * test or the mock will remain active on the current thread.
+     * <p>
+     * See examples in javadoc for {@link Mockito} class
+     *
+     * @param classToMock non-abstract class of which constructions should be mocked.
+     * @param mockSettingsFactory the mock settings to use.
+     * @return mock controller
+     */
+    @Incubating
+    @CheckReturnValue
+    public static <T> MockedConstruction<T> mockConstruction(
+            Class<T> classToMock,
+            Function<MockedConstruction.Context, MockSettings> mockSettingsFactory) {
+        return mockConstruction(classToMock, mockSettingsFactory, (mock, context) -> {});
+    }
+
+    /**
+     * Creates a thread-local mock controller for all constructions of the given class.
+     * The returned object's {@link MockedConstruction#close()} method must be called upon completing the
+     * test or the mock will remain active on the current thread.
+     * <p>
+     * See examples in javadoc for {@link Mockito} class
+     *
+     * @param classToMock non-abstract class of which constructions should be mocked.
+     * @param mockSettings the settings to use.
+     * @param mockInitializer a callback to prepare a mock's methods after its instantiation.
+     * @return mock controller
+     */
+    @Incubating
+    @CheckReturnValue
+    public static <T> MockedConstruction<T> mockConstruction(
+            Class<T> classToMock,
+            MockSettings mockSettings,
+            MockedConstruction.MockInitializer<T> mockInitializer) {
+        return mockConstruction(classToMock, index -> mockSettings, mockInitializer);
+    }
+
+    /**
+     * Creates a thread-local mock controller for all constructions of the given class.
+     * The returned object's {@link MockedConstruction#close()} method must be called upon completing the
+     * test or the mock will remain active on the current thread.
+     * <p>
+     * See examples in javadoc for {@link Mockito} class
+     *
+     * @param classToMock non-abstract class of which constructions should be mocked.
+     * @param mockSettingsFactory a function to create settings to use.
+     * @param mockInitializer a callback to prepare a mock's methods after its instantiation.
+     * @return mock controller
+     */
+    @Incubating
+    @CheckReturnValue
+    public static <T> MockedConstruction<T> mockConstruction(
+            Class<T> classToMock,
+            Function<MockedConstruction.Context, MockSettings> mockSettingsFactory,
+            MockedConstruction.MockInitializer<T> mockInitializer) {
+        return MOCKITO_CORE.mockConstruction(classToMock, mockSettingsFactory, mockInitializer);
+    }
+
     /**
      * Enables stubbing methods. Use it when you want the mock to return particular value when particular method is called.
      * <p>

src/main/java/org/mockito/ScopedMock.java

@@ -0,0 +1,31 @@
+/*
+ * Copyright (c) 2007 Mockito contributors
+ * This program is made available under the terms of the MIT License.
+ */
+package org.mockito;
+
+/**
+ * Represents a mock with a thread-local explicit scope. Scoped mocks must be closed by the entity
+ * that activates the scoped mock.
+ */
+@Incubating
+public interface ScopedMock extends AutoCloseable {
+
+    /**
+     * Checks if this mock is closed.
+     *
+     * @return {@code true} if this mock is closed.
+     */
+    boolean isClosed();
+
+    /**
+     * Closes this scoped mock and throws an exception if already closed.
+     */
+    @Override
+    void close();
+
+    /**
+     * Releases this scoped mock and is non-operational if already released.
+     */
+    void closeOnDemand();
+}

src/main/java/org/mockito/creation/instance/InstantiationException.java

@@ -13,6 +13,13 @@
  */
 public class InstantiationException extends MockitoException {
 
+    /**
+     * @since 3.5.0
+     */
+    public InstantiationException(String message) {
+        super(message);
+    }
+
     /**
      * @since 2.15.4
      */