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How to use InMemoryClassLoader method of org.mockitoutil.ClassLoaders class

Best Mockito code snippet using org.mockitoutil.ClassLoaders.InMemoryClassLoader

Source:ClassLoadersTest.java

1package org.mockitoutil;2import org.junit.Test;3import org.mockito.Mockito;4import static org.fest.assertions.Assertions.assertThat;5import static org.junit.Assert.fail;6import static org.mockitoutil.ClassLoaders.currentClassLoader;7import static org.mockitoutil.ClassLoaders.excludingClassLoader;8import static org.mockitoutil.ClassLoaders.isolatedClassLoader;9import static org.mockitoutil.ClassLoaders.jdkClassLoader;10public class ClassLoadersTest {11    public static final String CLASS_NAME_USING_INTERFACE = "org.mockitoutil.ClassLoadersTest$ClassUsingInterface1";12    public static final String INTERFACE_NAME = "org.mockitoutil.ClassLoadersTest$Interface1";13    @Test(expected = ClassNotFoundException.class)14    public void isolated_class_loader_cannot_load_classes_when_no_given_prefix() throws Exception {15        // given16        ClassLoader cl = isolatedClassLoader().build();17        // when18        cl.loadClass("org.mockito.Mockito");19        // then raises CNFE20    }21    @Test22    public void isolated_class_loader_cannot_load_classes_if_no_code_source_path() throws Exception {23        // given24        ClassLoader cl = isolatedClassLoader()25                .withPrivateCopyOf(CLASS_NAME_USING_INTERFACE)26                .build();27        // when28        try {29            cl.loadClass(CLASS_NAME_USING_INTERFACE);30            fail();31        } catch (ClassNotFoundException e) {32            // then33            assertThat(e.getMessage()).contains(CLASS_NAME_USING_INTERFACE);34        }35    }36    @Test37    public void isolated_class_loader_cannot_load_classes_not_matching_the_prefix() throws Exception {38        // given39        ClassLoader cl = isolatedClassLoader()40                .withCurrentCodeSourceUrls()41                .withPrivateCopyOf(CLASS_NAME_USING_INTERFACE)42                .build();43        // when44        try {45            cl.loadClass(CLASS_NAME_USING_INTERFACE);46            fail();47        } catch (NoClassDefFoundError e) {48            // then49            assertThat(e.getMessage()).contains("org/mockitoutil/ClassLoadersTest$Interface1");50        }51    }52    @Test53    public void isolated_class_loader_can_load_all_classes_unless_all_classes_mathch_the_prefixes() throws Exception {54        // given55        ClassLoader cl = isolatedClassLoader()56                .withCurrentCodeSourceUrls()57                .withPrivateCopyOf(CLASS_NAME_USING_INTERFACE)58                .withPrivateCopyOf(INTERFACE_NAME)59                .build();60        // when61        Class<?> aClass = cl.loadClass(CLASS_NAME_USING_INTERFACE);62        // then63        assertThat(aClass).isNotNull();64        assertThat(aClass.getClassLoader()).isEqualTo(cl);65        assertThat(aClass.getInterfaces()[0].getClassLoader()).isEqualTo(cl);66    }67    @Test68    public void isolated_class_loader_has_no_parent() throws Exception {69        ClassLoader cl = isolatedClassLoader()70                .withCurrentCodeSourceUrls()71                .withPrivateCopyOf(CLASS_NAME_USING_INTERFACE)72                .withPrivateCopyOf(INTERFACE_NAME)73                .build();74        assertThat(cl.getParent()).isNull();75    }76    @Test(expected = ClassNotFoundException.class)77    public void excluding_class_loader_cannot_load_classes_when_no_correct_source_url_set() throws Exception {78        // given79        ClassLoader cl = excludingClassLoader()80                .withCodeSourceUrlOf(this.getClass())81                .build();82        // when83        cl.loadClass("org.mockito.Mockito");84        // then class CNFE85    }86    @Test87    public void excluding_class_loader_can_load_classes_when_correct_source_url_set() throws Exception {88        // given89        ClassLoader cl = excludingClassLoader()90                .withCodeSourceUrlOf(Mockito.class)91                .build();92        // when93        cl.loadClass("org.mockito.Mockito");94        // then class successfully loaded95    }96    @Test97    public void excluding_class_loader_cannot_load_class_when_excluded_prefix_match_class_to_load() throws Exception {98        // given99        ClassLoader cl = excludingClassLoader()100                .withCodeSourceUrlOf(Mockito.class)101                .without("org.mockito.BDDMockito")102                .build();103        cl.loadClass("org.mockito.Mockito");104        // when105        try {106            cl.loadClass("org.mockito.BDDMockito");107            fail("should have raise a ClassNotFoundException");108        } catch (ClassNotFoundException e) {109            assertThat(e.getMessage()).contains("org.mockito.BDDMockito");110        }111        // then class successfully loaded112    }113    @Test114    public void can_not_load_a_class_not_previously_registered_in_builder() throws Exception {115        // given116        ClassLoader cl = ClassLoaders117                .inMemoryClassLoader()118                .withClassDefinition("yop.Dude", SimpleClassGenerator.makeMarkerInterface("yop.Dude"))119                .build();120        // when121        try {122            cl.loadClass("not.Defined");123            fail();124        } catch (ClassNotFoundException e) {125            // then126            assertThat(e.getMessage()).contains("not.Defined");127        }128    }129    @Test130    public void can_load_a_class_in_memory_from_bytes() throws Exception {131        // given132        ClassLoader cl = ClassLoaders133                .inMemoryClassLoader()134                .withClassDefinition("yop.Dude", SimpleClassGenerator.makeMarkerInterface("yop.Dude"))135                .build();136        // when137        Class<?> aClass = cl.loadClass("yop.Dude");138        // then139        assertThat(aClass).isNotNull();140        assertThat(aClass.getClassLoader()).isEqualTo(cl);141        assertThat(aClass.getName()).isEqualTo("yop.Dude");142    }143    @Test144    public void cannot_load_a_class_file_not_in_parent() throws Exception {145        // given146        ClassLoader cl = ClassLoaders147                .inMemoryClassLoader()148                .withParent(jdkClassLoader())149                .build();150        cl.loadClass("java.lang.String");151        try {152            // when153            cl.loadClass("org.mockito.Mockito");154            fail("should have not found Mockito class");155        } catch (ClassNotFoundException e) {156            // then157            assertThat(e.getMessage()).contains("org.mockito.Mockito");158        }159    }160    @Test161    public void can_list_all_classes_reachable_in_a_classloader() throws Exception {162        ClassLoader classLoader = ClassLoaders.inMemoryClassLoader()163                .withParent(jdkClassLoader())164                .withClassDefinition("a.A", SimpleClassGenerator.makeMarkerInterface("a.A"))165                .withClassDefinition("a.b.B", SimpleClassGenerator.makeMarkerInterface("a.b.B"))166                .withClassDefinition("c.C", SimpleClassGenerator.makeMarkerInterface("c.C"))167//                .withCodeSourceUrlOf(ClassLoaders.class)168                .build();169        assertThat(ClassLoaders.in(classLoader).listOwnedClasses()).containsOnly("a.A", "a.b.B", "c.C");170        assertThat(ClassLoaders.in(classLoader).omit("b", "c").listOwnedClasses()).containsOnly("a.A");171    }172    @Test173    public void return_bootstrap_classloader() throws Exception {174        assertThat(jdkClassLoader()).isNotEqualTo(Mockito.class.getClassLoader());175        assertThat(jdkClassLoader()).isNotEqualTo(ClassLoaders.class.getClassLoader());176        assertThat(jdkClassLoader()).isEqualTo(Number.class.getClassLoader());177        assertThat(jdkClassLoader()).isEqualTo(null);178    }179    @Test180    public void return_current_classloader() throws Exception {181        assertThat(currentClassLoader()).isEqualTo(this.getClass().getClassLoader());182    }183    static class ClassUsingInterface1 implements Interface1 { }184    interface Interface1 { }185}...

InMemoryClassLoader

Using AI Code Generation

1import org.junit.Test;2import org.junit.runner.RunWith;3import org.mockito.runners.MockitoJUnitRunner;4@RunWith(MockitoJUnitRunner.class)5public class TestClass {6    public void testLoadClass() throws Exception {7                .builder(ClassLoaders.getClassLoader(getClass()), "MyClass")8                .source("MyClass", "package com.example; public class MyClass {}")9                .build()10                .loadClass("com.example.MyClass");11        System.out.println(clazz);12    }13}

InMemoryClassLoader

Using AI Code Generation

1@DisplayName("Class under test")2class ClassUnderTestTest {3    @DisplayName("should do something")4    void shouldDoSomething() {5    }6}7@DisplayName("Class under test")8class ClassUnderTestTest {9    @DisplayName("should do something")10    void shouldDoSomething() {11    }12}13@DisplayName("Class under test")14class ClassUnderTestTest {15    @DisplayName("should do something")16    void shouldDoSomething() {17    }18}19@DisplayName("Class under test")20class ClassUnderTestTest {21    @DisplayName("should do something")22    void shouldDoSomething() {23    }24}25@DisplayName("Class under test")26class ClassUnderTestTest {27    @DisplayName("should do something")28    void shouldDoSomething() {29    }30}31@DisplayName("Class under test")32class ClassUnderTestTest {33    @DisplayName("should do something")34    void shouldDoSomething() {35    }36}37@DisplayName("Class under test")38class ClassUnderTestTest {39    @DisplayName("should do something")40    void shouldDoSomething() {41    }42}

InMemoryClassLoader

Using AI Code Generation

1public class ClassToBeLoaded {2    public String hello() {3        return "Hello World";4    }5}6public class ClassLoaderTest {7    public void classLoaderTest() {8        ClassToBeLoaded classToBeLoaded = new ClassToBeLoaded();9        byte[] byteCode = ClassFileBytesExtractor.extractBytesFromClassFile(ClassToBeLoaded.class);10        ClassLoader classLoader = new InMemoryClassLoader(byteCode);11        Class<?> clazz = null;12        try {13            clazz = classLoader.loadClass(ClassToBeLoaded.class.getName());14            Object instance = clazz.newInstance();15            Method helloMethod = clazz.getDeclaredMethod("hello");16            String hello = (String) helloMethod.invoke(instance);17            System.out.println(hello);18        } catch (ClassNotFoundException | IllegalAccessException | InstantiationException | NoSuchMethodException | InvocationTargetException e) {19            e.printStackTrace();20        }21    }22}

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