How to use SmartNullsGenericBugTest class of org.mockitousage.stubbing package

Best Mockito code snippet using org.mockitousage.stubbing.SmartNullsGenericBugTest

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...7import org.junit.Test;8import org.mockito.Answers;9import org.mockito.Mockito;10/​/​ Reproduces issue #155111public class SmartNullsGenericBugTest {12 @Test13 public void smart_nulls_generic_bug_generic_T() {14 SmartNullsGenericBugTest.ConcreteDao concreteDao = Mockito.mock(SmartNullsGenericBugTest.ConcreteDao.class, Mockito.withSettings().defaultAnswer(Answers.RETURNS_SMART_NULLS));15 final SmartNullsGenericBugTest.Entity result = concreteDao.findById();16 Assertions.assertThat(result).as("#1551").isNotNull();17 }18 @Test19 public void smart_nulls_generic_bug_generic_M() {20 SmartNullsGenericBugTest.ConcreteDao concreteDao = Mockito.mock(SmartNullsGenericBugTest.ConcreteDao.class, Mockito.withSettings().defaultAnswer(Answers.RETURNS_SMART_NULLS));21 final String other = concreteDao.find();22 Assertions.assertThat(other).as("#1551 - CCannot resolve type").isNull();23 }24 @Test25 public void smart_nulls_generic_bug_generic_M_provided_in_args() {26 SmartNullsGenericBugTest.ConcreteDao concreteDao = Mockito.mock(SmartNullsGenericBugTest.ConcreteDao.class, Mockito.withSettings().defaultAnswer(Answers.RETURNS_SMART_NULLS));27 final String other = concreteDao.findArgs(1, "plop");28 Assertions.assertThat(other).as("#1551").isEqualTo("");29 }30 @Test31 public void smart_nulls_generic_bug_generic_M_provided_as_varargs() {32 SmartNullsGenericBugTest.ConcreteDao concreteDao = Mockito.mock(SmartNullsGenericBugTest.ConcreteDao.class, Mockito.withSettings().defaultAnswer(Answers.RETURNS_SMART_NULLS));33 final String other = concreteDao.findVarargs(42, "plip", "plop");34 Assertions.assertThat(other).as("#1551").isEqualTo("");35 }36 static class AbstractDao<T> {37 T findById() {38 return null;39 }40 <M> M find() {41 return null;42 }43 <M> M findArgs(int idx, M arg) {44 return null;45 }46 <M> M findVarargs(int idx, M... args) {47 return null;48 }49 }50 static class Entity {}51 static class ConcreteDao extends SmartNullsGenericBugTest.AbstractDao<SmartNullsGenericBugTest.Entity> {}52}...

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SmartNullsGenericBugTest

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1import org.junit.Test2import org.mockito.Mock3import org.mockito.Mockito.when4import org.mockitousage.IMethods5import org.mockitoutil.TestBase6class SmartNullsGenericBugTest : TestBase() {7 fun test() {8 when(mock.oneArg<Any?>(null)).thenReturn(null)9 }10}11import org.junit.Test12import org.mockito.Mock13import org.mockito.Mockito.when14import org.mockitousage.IMethods15import org.mockitoutil.TestBase16class SmartNullsGenericBugTest : TestBase() {17 fun test() {18 when(mock.oneArg<Any?>(null)).thenReturn(null)19 }20}21import org.junit.Test22import org.mockito.Mock23import org.mockito.Mockito.when24import org.mockitousage.IMethods25import org.mockitoutil.TestBase26class SmartNullsGenericBugTest : TestBase() {27 fun test() {28 when(mock.oneArg<Any?>(null)).thenReturn(null)29 }30}31import org.junit.Test32import org.mockito.Mock33import org.mockito.Mockito.when34import org.mockitousage.IMethods35import org.mockitoutil.TestBase36class SmartNullsGenericBugTest : TestBase() {37 fun test() {38 when(mock.oneArg<Any?>(null)).thenReturn(null)39 }40}41import org.junit.Test42import org.mockito.Mock43import org.mockito.Mockito.when44import org.mockitousage.IMethods45import org.mockitoutil.TestBase46class SmartNullsGenericBugTest : TestBase() {

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SmartNullsGenericBugTest

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1package org.mockitousage.stubbing;2import org.junit.Test;3import org.mockito.MockSettings;4import org.mockito.Mockito;5import org.mockitoutil.TestBase;6import static org.assertj.core.api.Assertions.assertThat;7import static org.mockito.Mockito.mock;8public class SmartNullsGenericBugTest extends TestBase {9 public void should_mock_generic_type() {10 MockSettings settings = Mockito.withSettings().smartNulls();11 Generic<String> mock = mock(Generic.class, settings);12 assertThat(mock).isNotNull();13 }14 interface Generic<T> {15 T get();16 }17}18package org.mockitousage.stubbing;19import org.junit.Test;20import org.mockito.MockSettings;21import org.mockito.Mockito;22import org.mockitoutil.TestBase;23import static org.assertj.core.api.Assertions.assertThat;24import static org.mockito.Mockito.mock;25public class SmartNullsGenericBugTest extends TestBase {26 public void should_mock_generic_type() {27 MockSettings settings = Mockito.withSettings().smartNulls();28 Generic<String> mock = mock(Generic.class, settings);29 assertThat(mock).isNotNull();30 }31 interface Generic<T> {32 T get();33 }34}35package org.mockitousage.stubbing;36import org.junit.Test;37import org.mockito.MockSettings;38import org.mockito.Mockito;39import org.mockitoutil.TestBase;40import static org.assertj.core.api.Assertions.assertThat;41import static org.mockito.Mockito.mock;42public class SmartNullsGenericBugTest extends TestBase {43 public void should_mock_generic_type() {44 MockSettings settings = Mockito.withSettings().smartNulls();45 Generic<String> mock = mock(Generic.class, settings);46 assertThat(mock).isNotNull();47 }48 interface Generic<T> {49 T get();50 }51}52package org.mockitousage.stubbing;53import org.junit.Test;54import org.mockito.MockSettings;55import org.mockito.Mockito;56import org.mockitoutil.TestBase;57import static org.assertj.core.api.Assertions.assertThat;58import static org.mockito.Mockito.mock;59public class SmartNullsGenericBugTest extends TestBase {60 public void should_mock_generic_type() {

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1package org.mockitousage.stubbing;2import static org.mockito.Mockito.*;3import static org.junit.Assert.*;4import org.junit.Test;5import org.mockito.Mock;6import org.mockito.exceptions.misusing.NullInsteadOfMockException;7import org.mockitoutil.TestBase;8public class SmartNullsGenericBugTest extends TestBase {9 interface Foo<T> {10 void foo(T t);11 }12 Foo<String> foo;13 public void shouldNotThrowNPE() {14 try {15 foo.foo(null);16 fail();17 } catch (NullInsteadOfMockException e) {18 }19 }20}

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SmartNullsGenericBugTest

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1import org.junit.Test;2import org.mockito.Mockito;3import java.util.List;4import static org.mockito.Mockito.*;5public class SmartNullsGenericBugTest {6 interface MyInterface<T> {7 T get();8 }9 public void test() {10 MyInterface<List<String>> mock = Mockito.mock(MyInterface.class);11 when(mock.get()).thenReturn(null);12 mock.get().add("test");13 }14}15 when(mock.get()).thenReturn(null);16org/​mockitousage/​stubbing/​SmartNullsGenericBugTest.java:13: error: [dereference.of.nullable] dereference of possibly-null reference mock.get()17 mock.get().add("test");18We can fix this by using a type annotation that indicates that the return value of get() is null:19import org.junit.Test;20import org.mockito.Mockito;21import java.util.List;22import static org.mockito.Mockito.*;23public class SmartNullsGenericBugTest {24 interface MyInterface<T> {25 T get();26 }27 public void test() {28 MyInterface<List<String>> mock = Mockito.mock(MyInterface.class);29 when(mock.get()).thenReturn(null);30 mock.get().add("test");31 }32}33org/​mockitousage/​stubbing/​SmartNullsGenericBugTest.java:13: error: [dereference.of.nullable] dereference of possibly-null reference mock.get()34 mock.get().add("test");

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1public class SmartNullsGenericBugTest {2 public void test() {3 final List<String> mockedList = mock(List.class);4 when(mockedList.get(0)).thenReturn("Hello World");5 System.out.println(mockedList.get(0));6 }7}8public class SmartNullsGenericBugTestTest {9 public void test() {10 final List<String> mockedList = mock(List.class);11 when(mockedList.get(0)).thenReturn("Hello World");12 System.out.println(mockedList.get(0));13 }14}15public class SmartNullsGenericBugTestTest2 {16 public void test() {17 final List<String> mockedList = mock(List.class);18 when(mockedList.get(0)).thenReturn("Hello World");19 System.out.println(mockedList.get(0));20 }21}22public class SmartNullsGenericBugTestTest3 {23 public void test() {24 final List<String> mockedList = mock(List.class);25 when(mockedList.get(0)).thenReturn("Hello World");26 System.out.println(mockedList.get(0));27 }28}29public class SmartNullsGenericBugTestTest4 {30 public void test() {31 final List<String> mockedList = mock(List.class);32 when(mockedList.get(0)).thenReturn("Hello World");33 System.out.println(mockedList.get(0));34 }35}36public class SmartNullsGenericBugTestTest5 {37 public void test() {38 final List<String> mockedList = mock(List.class);39 when(mockedList.get(0)).thenReturn("Hello World");40 System.out.println(mockedList.get(0));41 }42}43public class SmartNullsGenericBugTestTest6 {44 public void test() {45 final List<String> mockedList = mock(List.class);

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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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