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GenericTypeMockTest.java
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/
GenericTypeMockTest.java
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/*
* Copyright (c) 2023 Mockito contributors
* This program is made available under the terms of the MIT License.
*/
package org.mockitousage;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertNotNull;
import static org.junit.jupiter.api.Assertions.assertNull;
import static org.junit.jupiter.api.Assertions.assertSame;
import static org.mockito.MockitoAnnotations.*;
import java.io.Serializable;
import java.sql.Time;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Date;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.TreeSet;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Nested;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.ExtendWith;
import org.mockito.InjectMocks;
import org.mockito.Mock;
import org.mockito.junit.jupiter.MockitoExtension;
/**
* Tests that verify Mockito can discern mocks by generic types, so if there are multiple mock candidates
* with the same generic type but different type parameters available for injection into a given field,
* Mockito won't fail to inject (even if mock field name doesn't match under test's field name).
*/
@ExtendWith(MockitoExtension.class)
public class GenericTypeMockTest {
@Nested
public class SingleTypeParamTest {
public class UnderTestWithSingleTypeParam {
List<String> stringList;
List<Integer> intList;
}
@Mock private List<String> stringListMock;
@Mock private List<Integer> intListMock;
// must construct non-static inner class ourselves here
// (making it public static classes doesn't work either)
@InjectMocks
private UnderTestWithSingleTypeParam underTestWithSingleTypeParam =
new UnderTestWithSingleTypeParam();
@Test
void testSingleTypeParam() {
// testing for not null first before testing for equals,
// because assertEquals(null, null) == true,
// so test would succeed if both @Mock and @InjectMocks
// don't work at all
assertNotNull(stringListMock);
assertNotNull(intListMock);
assertEquals(stringListMock, underTestWithSingleTypeParam.stringList);
assertEquals(intListMock, underTestWithSingleTypeParam.intList);
}
}
@Nested
public class WildcardTest {
class UnderTestWithWildcard {
Set<? extends Date> dateSet;
Set<? extends Number> numberSet;
}
@Mock Set<Time> timeSetMock; // java.sql.Time extends Date
@Mock Set<Integer> integerSetMock;
@InjectMocks UnderTestWithWildcard underTestWithWildcard = new UnderTestWithWildcard();
@Test
void testWildcard() {
assertNotNull(timeSetMock);
assertNotNull(integerSetMock);
// this also tests whether WildcardType.upperBounds() is evaluated,
// i.e. that we match <? extends Date> to <Time> type parameter
assertEquals(timeSetMock, underTestWithWildcard.dateSet);
assertEquals(integerSetMock, underTestWithWildcard.numberSet);
}
}
@Nested
public class NestedTypeParametersTest {
public class UnderTestWithNestedTypeParameters {
Map<Integer, Collection<String>> intToStringCollectionMap;
Map<Integer, Collection<Integer>> intoToIntCollectionMap;
}
@Mock Map<Integer, Collection<String>> intToStringCollectionMapMock;
@Mock Map<Integer, Collection<Integer>> intToIntCollectionMapMock;
@InjectMocks
UnderTestWithNestedTypeParameters underTestWithNestedTypeParameters =
new UnderTestWithNestedTypeParameters();
@Test
void testNestedTypeParameters() {
assertNotNull(intToStringCollectionMapMock);
assertNotNull(intToIntCollectionMapMock);
assertEquals(
intToStringCollectionMapMock,
underTestWithNestedTypeParameters.intToStringCollectionMap);
assertEquals(
intToIntCollectionMapMock,
underTestWithNestedTypeParameters.intoToIntCollectionMap);
}
}
@Nested
public class GenericSubclassTest {
public class UnderTestWithGenericSubclass {
Set<String> stringSet;
Set<Integer> intSet;
}
@Mock TreeSet<String> stringTreeSetMock;
@Mock HashSet<Integer> intHashSetMock;
@InjectMocks
UnderTestWithGenericSubclass underTestWithGenericSubclass =
new UnderTestWithGenericSubclass();
@Test
void testGenericSubclass() {
assertNotNull(stringTreeSetMock);
assertNotNull(intHashSetMock);
assertEquals(stringTreeSetMock, underTestWithGenericSubclass.stringSet);
assertEquals(intHashSetMock, underTestWithGenericSubclass.intSet);
}
}
@Nested
public class MultipleCandidatesOneByNameTest {
public class UnderTestWithMultipleCandidatesOneByName {
List<String> stringList;
}
@Mock List<String> stringList;
@Mock List<String> stringListMock;
@InjectMocks
UnderTestWithMultipleCandidatesOneByName underTestWithMultipleCandidatesOneByName =
new UnderTestWithMultipleCandidatesOneByName();
@Test
void testMultipleCandidatesOneByName() {
// verify that when multiple mock candidates exist by type, and one of them matches by
// field name, that one is injected
assertNotNull(underTestWithMultipleCandidatesOneByName.stringList);
assertEquals(stringList, underTestWithMultipleCandidatesOneByName.stringList);
}
}
@Nested
public class NoneMatchByTypeParameterTest {
public class UnderTestWithNoMatches {
List<Integer> intList;
}
@Mock List<String> stringList;
@InjectMocks UnderTestWithNoMatches underTestWithNoMatches = new UnderTestWithNoMatches();
@Test
void testNoneMatchByTypeParameter() {
assertNotNull(stringList);
// verify that when no candidate matches by type parameter, none is injected
assertNull(underTestWithNoMatches.intList);
}
}
@Nested
public class NoneMatchByRawTypeTest {
public class UnderTestWithNoMatches {
List<Integer> intList;
}
@Mock Set<Integer> intSet;
@InjectMocks
UnderTestWithNoMatches underTestWithNoMatchesByRawType = new UnderTestWithNoMatches();
@Test
void testNoneMatchByRawType() {
assertNotNull(intSet);
// verify that when no candidate matches by raw type, none is injected
assertNull(underTestWithNoMatchesByRawType.intList);
}
}
@Nested
public class ClassWithTypeParameterNoMatchTest {
public class UnderTestWithTypeParameter<T> {
List<T> tList;
}
@Mock List<Integer> intList;
@InjectMocks
UnderTestWithTypeParameter<String> underTestWithTypeParameterNoMatch =
new UnderTestWithTypeParameter<String>();
@Test
void testWithTypeParameterNoMatch() {
assertNotNull(intList);
// verify that when no candidate matches by type parameter of class under test, none is
// injected
assertNull(underTestWithTypeParameterNoMatch.tList);
}
}
@Nested
public class ClassWithTypeParametersTest {
public class UnderTestWithTypeParameters<T1, T2> {
List<T1> t1List;
List<T2> t2List;
}
@Mock List<String> stringList;
@Mock List<Integer> intList;
@InjectMocks
UnderTestWithTypeParameters<String, Integer> underTestWithTypeParameters =
new UnderTestWithTypeParameters<String, Integer>();
@Test
void testWithTypeParameters() {
assertNotNull(stringList);
assertNotNull(intList);
// verify that we can match the type parameters of the class under test
assertEquals(stringList, underTestWithTypeParameters.t1List);
assertEquals(intList, underTestWithTypeParameters.t2List);
}
}
@Nested
public class InjectConcreteClassInFieldWithTypeParameter {
public class UnderTestWithTypeParameter<T> {
List<T> tList;
}
public class ConcreteStringList extends ArrayList<String> {}
@Mock ConcreteStringList concreteStringList;
@InjectMocks
UnderTestWithTypeParameter<String> underTestWithTypeParameters =
new UnderTestWithTypeParameter<String>();
@Test
void testWithTypeParameters() {
assertNotNull(concreteStringList);
// verify that we can match the type parameters of the class under test
assertEquals(concreteStringList, underTestWithTypeParameters.tList);
}
}
@Nested
public class NoneMatchInjectConcreteClassInFieldWithTypeParameterTest {
public class UnderTestWithTypeParameter<T> {
List<T> tList;
}
public class ConcreteStringList extends ArrayList<String> {}
@Mock ConcreteStringList concreteStringList;
@InjectMocks
UnderTestWithTypeParameter<Integer> underTestWithTypeParameters =
new UnderTestWithTypeParameter<Integer>();
@Test
void testWithTypeParameters() {
assertNotNull(concreteStringList);
// verify that when no concrete type candidate matches, none is injected
assertNull(underTestWithTypeParameters.tList);
}
}
/**
* Verify regression https://github.com/mockito/mockito/issues/2958 is fixed.
*/
@Nested
public class RegressionClassCastException {
public class AbstractUnderTest<A extends AbstractUnderTest<A>> {
UnderTestInstance<A> instance;
}
public class UnderTestInstance<I extends AbstractUnderTest<I>> {}
public class ConcreteUnderTest extends AbstractUnderTest<ConcreteUnderTest> {}
@Mock UnderTestInstance<ConcreteUnderTest> instanceMock;
@InjectMocks protected ConcreteUnderTest concreteUnderTest = new ConcreteUnderTest();
@BeforeEach
public void initMocks() {
openMocks(this);
}
@Test
public void testMockExists() {
assertNotNull(instanceMock);
assertEquals(instanceMock, concreteUnderTest.instance);
}
}
/**
* Verify regression https://github.com/mockito/mockito/issues/2974 is fixed.
*/
@Nested
public class RegressionNpe {
public abstract class Change {}
public class ChangeCollection<TChange extends Change> implements Iterable<TChange> {
private List<TChange> changes = new ArrayList<TChange>();
@Override
public Iterator<TChange> iterator() {
return null;
}
}
@Mock Change change0;
@InjectMocks ChangeCollection spiedImpl = new ChangeCollection();
@Mock(name = "changes")
List<Change> innerList;
@Test
public void testNoNpe() {
assertSame(innerList, spiedImpl.changes);
}
}
/* cannot define interface in nested test class RegressionArrayIndexOutOfBoundsExcepton ,
* because interface cannot be defined in a non-static inner class,
* and nested test class must be non-static in order for JUnit 5 to be able to run it */
public interface BaseRepository<E, I extends Serializable> {
E findById(I id);
E save(E entity);
}
/**
* Verify regression https://github.com/mockito/mockito/issues/3000 is fixed.
*/
@Nested
public class RegressionArrayIndexOutOfBoundsException {
public class BaseService<E, I extends Serializable> {
private BaseRepository<E, I> repository;
}
public class OneRepository implements BaseRepository<Map<String, String>, String> {
public Map<String, String> findById(String id) {
return Map.of();
}
public Map<String, String> save(Map<String, String> entity) {
return entity;
}
}
public class TwoRepository implements BaseRepository<Map<Integer, String>, String> {
public Map<Integer, String> findById(String id) {
return Map.of();
}
public Map<Integer, String> save(Map<Integer, String> entity) {
return entity;
}
}
public class One {}
;
public class Two implements Serializable {
private static final long serialVersionUID = 1L;
}
public class UnderTest extends BaseService<One, Two> {
private OneRepository oneRepository;
private TwoRepository twoRepository;
}
@Mock OneRepository oneRepository;
@Mock TwoRepository twoRepository;
@InjectMocks UnderTest underTest = new UnderTest();
@Test
public void testNoAioobe() {
assertNotNull(oneRepository);
assertNotNull(twoRepository);
assertNotNull(underTest);
}
}
}