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

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

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...6import org.mockito.Mock;7import org.mockito.MockitoAnnotations;8import org.mockito.Spy;9import org.mockito.internal.util.MockUtil;10import org.mockito.internal.util.reflection.FieldReader;11import java.lang.reflect.Field;12import java.util.Set;13import static org.mockito.internal.util.collections.Sets.newMockSafeHashSet;14/​**15 * Scan mocks, and prepare them if needed.16 */​17public class MockScanner {18 private MockUtil mockUtil = new MockUtil();19 private final Object instance;20 private final Class<?> clazz;21 /​**22 * Creates a MockScanner.23 *24 * @param instance The test instance25 * @param clazz The class in the type hierarchy of this instance.26 */​27 public MockScanner(Object instance, Class<?> clazz) {28 this.instance = instance;29 this.clazz = clazz;30 }31 /​**32 * Add the scanned and prepared mock instance to the given collection.33 *34 * <p>35 * The preparation of mocks consists only in defining a MockName if not already set.36 * </​p>37 *38 * @param mocks Set of mocks39 */​40 public void addPreparedMocks(Set<Object> mocks) {41 mocks.addAll(scan());42 }43 /​**44 * Scan and prepare mocks for the given <code>testClassInstance</​code> and <code>clazz</​code> in the type hierarchy.45 *46 * @return A prepared set of mock47 */​48 private Set<Object> scan() {49 Set<Object> mocks = newMockSafeHashSet();50 for (Field field : clazz.getDeclaredFields()) {51 /​/​ mock or spies only52 FieldReader fieldReader = new FieldReader(instance, field);53 Object mockInstance = preparedMock(fieldReader.read(), field);54 if (mockInstance != null) {55 mocks.add(mockInstance);56 }57 }58 return mocks;59 }60 private Object preparedMock(Object instance, Field field) {61 if (isAnnotatedByMockOrSpy(field)) {62 return instance;63 } else if (isMockOrSpy(instance)) {64 mockUtil.maybeRedefineMockName(instance, field.getName());65 return instance;66 }...

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...6import org.mockito.Mockito;7import org.mockito.Spy;8import org.mockito.exceptions.base.MockitoException;9import org.mockito.internal.util.MockUtil;10import org.mockito.internal.util.reflection.FieldReader;11import org.mockito.internal.util.reflection.FieldSetter;12import java.lang.reflect.Field;13import java.util.Set;14import static org.mockito.Mockito.withSettings;15/​**16 * Handler for field annotated with &#64;InjectMocks and &#64;Spy.17 *18 * <p>19 * The handler assumes that field initialization AND injection already happened.20 * So if the field is still null, then nothing will happen there.21 * </​p>22 */​23public class SpyOnInjectedFieldsHandler extends MockInjectionStrategy {24 @Override25 protected boolean processInjection(Field field, Object fieldOwner, Set<Object> mockCandidates) {26 FieldReader fieldReader = new FieldReader(fieldOwner, field);27 /​/​ TODO refoctor : code duplicated in SpyAnnotationEngine28 if(!fieldReader.isNull() && field.isAnnotationPresent(Spy.class)) {29 try {30 Object instance = fieldReader.read();31 if (new MockUtil().isMock(instance)) {32 /​/​ A. instance has been spied earlier33 /​/​ B. protect against multiple use of MockitoAnnotations.initMocks()34 Mockito.reset(instance);35 } else {36 new FieldSetter(fieldOwner, field).set(37 Mockito.mock(instance.getClass(), withSettings()38 .spiedInstance(instance)39 .defaultAnswer(Mockito.CALLS_REAL_METHODS)40 .name(field.getName()))...

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FieldReader

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1package org.mockito.internal.util.reflection;2import java.lang.reflect.Field;3import java.lang.reflect.Modifier;4import java.util.ArrayList;5import java.util.List;6public class FieldReader {7 private final Field field;8 public FieldReader(Field field) {9 this.field = field;10 field.setAccessible(true);11 }12 public Object read(Object target) {13 try {14 return field.get(target);15 } catch (IllegalAccessException e) {16 throw new RuntimeException(e);17 }18 }19 public boolean isFinal() {20 return Modifier.isFinal(field.getModifiers());21 }22 public boolean isStatic() {23 return Modifier.isStatic(field.getModifiers());24 }25 public boolean isTransient() {26 return Modifier.isTransient(field.getModifiers());27 }28 public boolean isSynthetic() {29 return field.isSynthetic();30 }31 public static List<Field> getFieldsIncludingInherited(Class<?> clazz) {32 List<Field> fields = new ArrayList<Field>();33 for (Class<?> c = clazz; c != null; c = c.getSuperclass()) {34 for (Field f : c.getDeclaredFields()) {35 fields.add(f);36 }37 }38 return fields;39 }40 public static List<Field> getFieldsIncludingInherited(Class<?> clazz, FieldFilter filter) {41 List<Field> fields = new ArrayList<Field>();42 for (Class<?> c = clazz; c != null; c = c.getSuperclass()) {43 for (Field f : c.getDeclaredFields()) {44 if (filter.accept(f)) {45 fields.add(f);46 }47 }48 }49 return fields;50 }51 public static FieldReader field(Object target, String fieldName) {52 return new FieldReader(Fields.field(target.getClass(), fieldName));53 }54 public static FieldReader field(Class<?> clazz, String fieldName) {55 return new FieldReader(Fields.field(clazz, fieldName));56 }57 public static FieldReader field(Object target, Class<?> fieldType) {58 return new FieldReader(Fields.field(target.getClass(), fieldType));59 }60 public static FieldReader field(Class<?> clazz, Class<?> fieldType) {61 return new FieldReader(Fields.field(clazz, fieldType));62 }63 public static FieldReader field(Object target, Class<?> fieldType, String fieldName) {64 return new FieldReader(Fields.field(target.getClass(), fieldType, fieldName));65 }66 public static FieldReader field(Class<?> clazz, Class<?> fieldType, String fieldName) {

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FieldReader

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1import org.mockito.internal.util.reflection.FieldReader;2import java.lang.reflect.Field;3import java.util.List;4import java.util.ArrayList;5import java.lang.reflect.Method;6public class Test {7 public static void main(String[] args) {8 List<String> list = new ArrayList<String>();9 list.add("one");10 list.add("two");11 list.add("three");12 FieldReader fieldReader = new FieldReader(list);13 List<String> list2 = (List<String>) fieldReader.readField("elementData");14 System.out.println("list2: " + list2);15 }16}

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1import org.mockito.internal.util.reflection.FieldReader;2import org.mockito.internal.util.reflection.FieldReader.FieldNotFoundException;3public class 1 {4 public static void main(String[] args) {5 String s = "Hello World!";6 FieldReader fieldReader = new FieldReader(s);7 try {8 char[] value = (char[]) fieldReader.read("value");9 System.out.println(value);10 } catch (FieldNotFoundException e) {11 e.printStackTrace();12 }13 }14}15[Ljava.lang.String;@6d06d69c16Object read(Object target)17The syntax of the read() method is as follows:18Object read(Object target)19Example: Using the read() method of the Field class20import java.lang.reflect.Field;21public class 2 {22 public static void main(String[] args) {23 String s = "Hello World!";24 try {25 Field field = s.getClass().getDeclaredField("value");26 field.setAccessible(true);27 char[] value = (char[]) field.get(s);28 System.out.println(value);29 } catch (NoSuchFieldException e) {30 e.printStackTrace();31 } catch (IllegalAccessException e) {

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FieldReader

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1import org.mockito.internal.util.reflection.FieldReader;2import org.mockito.internal.util.reflection.FieldWriter;3public class Test {4 public static void main(String[] args) {5 FieldReader reader = new FieldReader();6 FieldWriter writer = new FieldWriter();7 Test t = new Test();8 System.out.println(reader.read("name", t));9 writer.write("name", t, "new name");10 System.out.println(reader.read("name", t));11 }12 private String name = "test";13}

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1import org.mockito.internal.util.reflection.FieldReader;2public class 1 {3 public static void main(String[] args) {4 ClassToTest ctt = new ClassToTest();5 FieldReader fr = new FieldReader();6 Integer i = (Integer) fr.readField("privateField", ctt);7 System.out.println(i);8 }9}10public class ClassToTest {11 private Integer privateField = 1;12 public Integer publicField = 2;13}

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1package org.mockito.internal.util.reflection;2import org.mockito.internal.util.reflection.FieldReader;3public class FieldReaderTest {4 public static void main(String[] args) {5 FieldReaderTest obj = new FieldReaderTest();6 System.out.println(obj.getValue());7 }8 private int getValue() {9 return 10;10 }11}12package org.mockito.internal.util.reflection;13import org.mockito.internal.util.reflection.FieldWriter;14public class FieldWriterTest {15 public static void main(String[] args) {16 FieldWriterTest obj = new FieldWriterTest();17 obj.setValue(20);18 System.out.println(obj.getValue());19 }20 private int getValue() {21 return 10;22 }23 private void setValue(int value) {24 }25}26package org.mockito.internal.util.reflection;27import org.mockito.internal.util.reflection.FieldSetter;28public class FieldSetterTest {29 public static void main(String[] args) {30 FieldSetterTest obj = new FieldSetterTest();31 FieldSetter.setField(obj, obj.getClass(), "value", 20);32 System.out.println(obj.getValue());33 }34 private int getValue() {35 return 10;36 }37 private int value;38}39package org.mockito.internal.util.reflection;40import org.mockito.internal.util.reflection.FieldInitializer;41public class FieldInitializerTest {42 public static void main(String[] args) {43 FieldInitializerTest obj = new FieldInitializerTest();44 FieldInitializer.setField(obj, obj.getClass(), "value", 20);45 System.out.println(obj.getValue());46 }47 private int getValue() {48 return 10;49 }50 private int value;51}52package org.mockito.internal.util.reflection;53import org.mockito.internal.util.reflection.Constructor;54public class ConstructorTest {55 public static void main(String[] args) {56 ConstructorTest obj = Constructor.of(ConstructorTest.class

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StackOverFlow community discussions

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Discussion

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WebApplicationContext doesn&#39;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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