Join the 1-day Testing & QA Summit featuring 15+ Expert Speakers.Register for FREE! Join TestMu Conference

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

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

Source:StubbingWithDelegateTest.java

...14import org.mockito.exceptions.base.MockitoException;15import org.mockitousage.IMethods;16import org.mockitousage.MethodsImpl;17@SuppressWarnings("unchecked")18public class StubbingWithDelegateTest {19    public class FakeList<T> {20        private T value;21        public T get(int i) {22            return value;23        }24        public T set(int i, T value) {25            this.value = value;26            return value;27        }28        public int size() {29            return 10;30        }31        public ArrayList<T> subList(int fromIndex, int toIndex) {32            return new ArrayList<T>();33        }34    }35    public class FakeListWithWrongMethods<T> {36        public double size() {37            return 10;38        }39        public Collection<T> subList(int fromIndex, int toIndex) {40            return new ArrayList<T>();41        }42    }43    @Test44    public void when_not_stubbed_delegate_should_be_called() {45        List<String> delegatedList = new ArrayList<String>();46        delegatedList.add("un");47        List<String> mock = Mockito.mock(List.class, AdditionalAnswers.delegatesTo(delegatedList));48        mock.add("two");49        Assert.assertEquals(2, mock.size());50    }51    @Test52    public void when_stubbed_the_delegate_should_not_be_called() {53        List<String> delegatedList = new ArrayList<String>();54        delegatedList.add("un");55        List<String> mock = Mockito.mock(List.class, AdditionalAnswers.delegatesTo(delegatedList));56        Mockito.doReturn(10).when(mock).size();57        mock.add("two");58        Assert.assertEquals(10, mock.size());59        Assert.assertEquals(2, delegatedList.size());60    }61    @Test62    public void delegate_should_not_be_called_when_stubbed2() {63        List<String> delegatedList = new ArrayList<String>();64        delegatedList.add("un");65        List<String> mockedList = Mockito.mock(List.class, AdditionalAnswers.delegatesTo(delegatedList));66        Mockito.doReturn(false).when(mockedList).add(Mockito.anyString());67        mockedList.add("two");68        Assert.assertEquals(1, mockedList.size());69        Assert.assertEquals(1, delegatedList.size());70    }71    @Test72    public void null_wrapper_dont_throw_exception_from_org_mockito_package() throws Exception {73        IMethods methods = Mockito.mock(IMethods.class, AdditionalAnswers.delegatesTo(new MethodsImpl()));74        try {75            byte b = methods.byteObjectReturningMethod();// real method returns null76            Assert.fail();77        } catch (Exception e) {78            assertThat(e.toString()).doesNotContain("org.mockito");79        }80    }81    @Test82    public void instance_of_different_class_can_be_called() {83        List<String> mock = Mockito.mock(List.class, AdditionalAnswers.delegatesTo(new StubbingWithDelegateTest.FakeList<String>()));84        mock.set(1, "1");85        assertThat(mock.get(1).equals("1")).isTrue();86    }87    @Test88    public void method_with_subtype_return_can_be_called() {89        List<String> mock = Mockito.mock(List.class, AdditionalAnswers.delegatesTo(new StubbingWithDelegateTest.FakeList<String>()));90        List<String> subList = mock.subList(0, 0);91        assertThat(subList.isEmpty()).isTrue();92    }93    @Test94    public void calling_missing_method_should_throw_exception() {95        List<String> mock = Mockito.mock(List.class, AdditionalAnswers.delegatesTo(new StubbingWithDelegateTest.FakeList<String>()));96        try {97            mock.isEmpty();98            Assert.fail();99        } catch (MockitoException e) {100            assertThat(e.toString()).contains("Methods called on mock must exist");101        }102    }103    @Test104    public void calling_method_with_wrong_primitive_return_should_throw_exception() {105        List<String> mock = Mockito.mock(List.class, AdditionalAnswers.delegatesTo(new StubbingWithDelegateTest.FakeListWithWrongMethods<String>()));106        try {107            mock.size();108            Assert.fail();109        } catch (MockitoException e) {110            assertThat(e.toString()).contains("Methods called on delegated instance must have compatible return type");111        }112    }113    @Test114    public void calling_method_with_wrong_reference_return_should_throw_exception() {115        List<String> mock = Mockito.mock(List.class, AdditionalAnswers.delegatesTo(new StubbingWithDelegateTest.FakeListWithWrongMethods<String>()));116        try {117            mock.subList(0, 0);118            Assert.fail();119        } catch (MockitoException e) {120            assertThat(e.toString()).contains("Methods called on delegated instance must have compatible return type");121        }122    }123    @Test124    public void exception_should_be_propagated_from_delegate() throws Exception {125        final RuntimeException failure = new RuntimeException("angry-method");126        IMethods methods = Mockito.mock(IMethods.class, AdditionalAnswers.delegatesTo(new MethodsImpl() {127            @Override128            public String simpleMethod() {129                throw failure;130            }131        }));132        try {133            methods.simpleMethod();// delegate throws an exception134            Assert.fail();135        } catch (RuntimeException e) {136            assertThat(e).isEqualTo(failure);137        }138    }139    interface Foo {140        int bar();141    }142    @Test143    public void should_call_anonymous_class_method() throws Throwable {144        StubbingWithDelegateTest.Foo foo = new StubbingWithDelegateTest.Foo() {145            public int bar() {146                return 0;147            }148        };149        StubbingWithDelegateTest.Foo mock = Mockito.mock(StubbingWithDelegateTest.Foo.class);150        Mockito.when(mock.bar()).thenAnswer(AdditionalAnswers.delegatesTo(foo));151        // when152        mock.bar();153        // then no exception is thrown154    }155}...

StubbingWithDelegateTest

Using AI Code Generation

1package org.mockitousage.stubbing;2import static org.mockito.Mockito.*;3import org.junit.Test;4import org.mockito.Mock;5import org.mockito.Mockito;6import org.mockitousage.IMethods;7import org.mockitoutil.TestBase;8public class StubbingWithDelegateTest extends TestBase {9    static class Foo {10        public String bar() {11            return "bar";12        }13    }14    static class FooDelegate implements IMethods {15        public String simpleMethod() {16            return "foo";17        }18    }19    @Mock FooDelegate delegate;20    public void shouldStubWithDelegate() {21        Foo foo = Mockito.mock(Foo.class, withSettings()22            .defaultAnswer(CALLS_REAL_METHODS)23            .useConstructor()24            .defaultAnswer(delegateTo(delegate)));25        when(delegate.simpleMethod()).thenReturn("bar");26        assertEquals("bar", foo.bar());27        assertEquals("bar", delegate.simpleMethod());28    }29}

Automation Testing Tutorials

Learn to execute automation testing from scratch with LambdaTest Learning Hub. Right from setting up the prerequisites to run your first automation test, to following best practices and diving deeper into advanced test scenarios. LambdaTest Learning Hubs compile a list of step-by-step guides to help you be proficient with different test automation frameworks i.e. Selenium, Cypress, TestNG etc.