How to use FieldInitializerTest class of org.mockito.internal.util.reflection package

Best Mockito code snippet using org.mockito.internal.util.reflection.FieldInitializerTest

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...10import org.mockito.BDDMockito;11import org.mockito.InjectMocks;12import org.mockito.Mockito;13import org.mockito.exceptions.base.MockitoException;14public class FieldInitializerTest {15 private FieldInitializerTest.StaticClass alreadyInstantiated = new FieldInitializerTest.StaticClass();16 private FieldInitializerTest.StaticClass noConstructor;17 private FieldInitializerTest.StaticClassWithDefaultConstructor defaultConstructor;18 private FieldInitializerTest.StaticClassWithPrivateDefaultConstructor privateDefaultConstructor;19 private FieldInitializerTest.StaticClassWithoutDefaultConstructor noDefaultConstructor;20 private FieldInitializerTest.StaticClassThrowingExceptionDefaultConstructor throwingExDefaultConstructor;21 private FieldInitializerTest.AbstractStaticClass abstractType;22 private FieldInitializerTest.Interface interfaceType;23 private FieldInitializerTest.InnerClassType innerClassType;24 private FieldInitializerTest.AbstractStaticClass instantiatedAbstractType = new FieldInitializerTest.ConcreteStaticClass();25 private FieldInitializerTest.Interface instantiatedInterfaceType = new FieldInitializerTest.ConcreteStaticClass();26 private FieldInitializerTest.InnerClassType instantiatedInnerClassType = new FieldInitializerTest.InnerClassType();27 @Test28 public void should_keep_same_instance_if_field_initialized() throws Exception {29 final FieldInitializerTest.StaticClass backupInstance = alreadyInstantiated;30 FieldInitializer fieldInitializer = new FieldInitializer(this, field("alreadyInstantiated"));31 FieldInitializationReport report = fieldInitializer.initialize();32 Assert.assertSame(backupInstance, report.fieldInstance());33 Assert.assertFalse(report.fieldWasInitialized());34 Assert.assertFalse(report.fieldWasInitializedUsingContructorArgs());35 }36 @Test37 public void should_instantiate_field_when_type_has_no_constructor() throws Exception {38 FieldInitializer fieldInitializer = new FieldInitializer(this, field("noConstructor"));39 FieldInitializationReport report = fieldInitializer.initialize();40 Assert.assertNotNull(report.fieldInstance());41 Assert.assertTrue(report.fieldWasInitialized());42 Assert.assertFalse(report.fieldWasInitializedUsingContructorArgs());43 }44 @Test45 public void should_instantiate_field_with_default_constructor() throws Exception {46 FieldInitializer fieldInitializer = new FieldInitializer(this, field("defaultConstructor"));47 FieldInitializationReport report = fieldInitializer.initialize();48 Assert.assertNotNull(report.fieldInstance());49 Assert.assertTrue(report.fieldWasInitialized());50 Assert.assertFalse(report.fieldWasInitializedUsingContructorArgs());51 }52 @Test53 public void should_instantiate_field_with_private_default_constructor() throws Exception {54 FieldInitializer fieldInitializer = new FieldInitializer(this, field("privateDefaultConstructor"));55 FieldInitializationReport report = fieldInitializer.initialize();56 Assert.assertNotNull(report.fieldInstance());57 Assert.assertTrue(report.fieldWasInitialized());58 Assert.assertFalse(report.fieldWasInitializedUsingContructorArgs());59 }60 @Test(expected = MockitoException.class)61 public void should_fail_to_instantiate_field_if_no_default_constructor() throws Exception {62 FieldInitializer fieldInitializer = new FieldInitializer(this, field("noDefaultConstructor"));63 fieldInitializer.initialize();64 }65 @Test66 public void should_fail_to_instantiate_field_if_default_constructor_throws_exception() throws Exception {67 FieldInitializer fieldInitializer = new FieldInitializer(this, field("throwingExDefaultConstructor"));68 try {69 fieldInitializer.initialize();70 Assert.fail();71 } catch (MockitoException e) {72 InvocationTargetException ite = ((InvocationTargetException) (e.getCause()));73 Assert.assertTrue(((ite.getTargetException()) instanceof NullPointerException));74 Assert.assertEquals("business logic failed", ite.getTargetException().getMessage());75 }76 }77 @Test(expected = MockitoException.class)78 public void should_fail_for_abstract_field() throws Exception {79 new FieldInitializer(this, field("abstractType"));80 }81 @Test82 public void should_not_fail_if_abstract_field_is_instantiated() throws Exception {83 new FieldInitializer(this, field("instantiatedAbstractType"));84 }85 @Test(expected = MockitoException.class)86 public void should_fail_for_interface_field() throws Exception {87 new FieldInitializer(this, field("interfaceType"));88 }89 @Test90 public void should_not_fail_if_interface_field_is_instantiated() throws Exception {91 new FieldInitializer(this, field("instantiatedInterfaceType"));92 }93 @Test(expected = MockitoException.class)94 public void should_fail_for_local_type_field() throws Exception {95 /​/​ when96 class LocalType {}97 class TheTestWithLocalType {98 @InjectMocks99 LocalType field;100 }101 TheTestWithLocalType testWithLocalType = new TheTestWithLocalType();102 /​/​ when103 new FieldInitializer(testWithLocalType, testWithLocalType.getClass().getDeclaredField("field"));104 }105 @Test106 public void should_not_fail_if_local_type_field_is_instantiated() throws Exception {107 /​/​ when108 class LocalType {}109 class TheTestWithLocalType {110 @InjectMocks111 LocalType field = new LocalType();112 }113 TheTestWithLocalType testWithLocalType = new TheTestWithLocalType();114 /​/​ when115 new FieldInitializer(testWithLocalType, testWithLocalType.getClass().getDeclaredField("field"));116 }117 @Test(expected = MockitoException.class)118 public void should_fail_for_inner_class_field() throws Exception {119 new FieldInitializer(this, field("innerClassType"));120 }121 @Test122 public void should_not_fail_if_inner_class_field_is_instantiated() throws Exception {123 new FieldInitializer(this, field("instantiatedInnerClassType"));124 }125 @Test126 public void can_instantiate_class_with_parameterized_constructor() throws Exception {127 FieldInitializer.ConstructorArgumentResolver resolver = BDDMockito.given(Mockito.mock(FieldInitializer.ConstructorArgumentResolver.class).resolveTypeInstances(ArgumentMatchers.any(Class.class))).willReturn(new Object[]{ null }).getMock();128 new FieldInitializer(this, field("noDefaultConstructor"), resolver).initialize();129 Assert.assertNotNull(noDefaultConstructor);130 }131 static class StaticClass {}132 static class StaticClassWithDefaultConstructor {133 StaticClassWithDefaultConstructor() {134 }135 }136 static class StaticClassWithPrivateDefaultConstructor {137 private StaticClassWithPrivateDefaultConstructor() {138 }139 }140 static class StaticClassWithoutDefaultConstructor {141 private StaticClassWithoutDefaultConstructor(String param) {142 }143 }144 static class StaticClassThrowingExceptionDefaultConstructor {145 StaticClassThrowingExceptionDefaultConstructor() throws Exception {146 throw new NullPointerException("business logic failed");147 }148 }149 abstract static class AbstractStaticClass {150 public AbstractStaticClass() {151 }152 }153 interface Interface {}154 static class ConcreteStaticClass extends FieldInitializerTest.AbstractStaticClass implements FieldInitializerTest.Interface {}155 class InnerClassType {156 InnerClassType() {157 }158 }159}...

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FieldInitializerTest

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1import org.mockito.internal.util.reflection.FieldInitializer;2import org.mockito.internal.util.reflection.FieldInitializerTest;3public class FieldInitializerTest {4 public void test() throws Exception {5 FieldInitializerTest test = new FieldInitializerTest();6 test.testFinalFieldInitialization();7 }8}9import org.mockito.internal.util.reflection.FieldInitializer;10public class FieldInitializerTest {11 public void test() throws Exception {12 FieldInitializer fieldInitializer = new FieldInitializer();13 fieldInitializer.initializeFields(new Object());14 }15}

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FieldInitializerTest

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1public class FieldInitializerTest {2 public void shouldInitializeFieldToNull() throws Exception {3 Field field = FieldInitializerTest.class.getDeclaredField("field");4 Object target = new FieldInitializerTest();5 FieldInitializer.initialize(field, target);6 assertNull(field.get(target));7 }8}9org.mockito.internal.util.reflection.FieldInitializerTest > shouldInitializeFieldToNull() PASSED

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FieldInitializerTest

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1public class FieldInitializerTest { 2private static class A { 3private A() {} 4public A(String s) {} 5} 6private static class B { 7private A a; 8} 9private static class C { 10private String s; 11private int i; 12private A a; 13private B b; 14} 15private static class D { 16private String s; 17private int i; 18private A a; 19private B b; 20private C c; 21} 22private static class E { 23private String s; 24private int i; 25private A a; 26private B b; 27private C c; 28private D d; 29} 30private static class F { 31private String s; 32private int i; 33private A a; 34private B b; 35private C c; 36private D d; 37private E e; 38} 39private static class G { 40private String s; 41private int i; 42private A a; 43private B b; 44private C c; 45private D d; 46private E e; 47private F f; 48} 49private static class H { 50private String s; 51private int i; 52private A a; 53private B b; 54private C c; 55private D d; 56private E e; 57private F f; 58private G g; 59} 60private static class I { 61private String s; 62private int i; 63private A a; 64private B b; 65private C c; 66private D d; 67private E e; 68private F f; 69private G g; 70private H h; 71} 72private static class J { 73private String s; 74private int i; 75private A a; 76private B b; 77private C c; 78private D d; 79private E e; 80private F f; 81private G g; 82private H h; 83private I i; 84} 85private static class K { 86private String s; 87private int i; 88private A a; 89private B b; 90private C c; 91private D d; 92private E e; 93private F f; 94private G g; 95private H h; 96private I i; 97private J j; 98} 99private static class L { 100private String s; 101private int i; 102private A a; 103private B b;

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WebApplicationContext doesn't autowire

If we assume that your job runs in such a small intervals that you really want your test to wait for job to be executed and you just want to test if job is invoked you can use following solution:

Add Awaitility to classpath:

<dependency>
    <groupId>org.awaitility</groupId>
    <artifactId>awaitility</artifactId>
    <version>3.1.0</version>
    <scope>test</scope>
</dependency>

Write test similar to:

@RunWith(SpringRunner.class)
@SpringBootTest
public class DemoApplicationTests {

    @SpyBean
    private MyTask myTask;

    @Test
    public void jobRuns() {
        await().atMost(Duration.FIVE_SECONDS)
               .untilAsserted(() -> verify(myTask, times(1)).work());
    }
}
https://stackoverflow.com/questions/32319640/how-to-test-spring-scheduled

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