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

How to use ClassLoadersTest class of org.mockitoutil package

Best Mockito code snippet using org.mockitoutil.ClassLoadersTest

Source:ClassLoadersTest.java

...12import static org.mockitoutil.ClassLoaders.currentClassLoader;13import static org.mockitoutil.ClassLoaders.excludingClassLoader;14import static org.mockitoutil.ClassLoaders.isolatedClassLoader;15import static org.mockitoutil.ClassLoaders.jdkClassLoader;16public class ClassLoadersTest {17    public static final String CLASS_NAME_DEPENDING_ON_INTERFACE = "org.mockitoutil.ClassLoadersTest$ClassUsingInterface1";18    public static final String INTERFACE_NAME = "org.mockitoutil.ClassLoadersTest$Interface1";19    @Test(expected = ClassNotFoundException.class)20    public void isolated_class_loader_cannot_load_classes_when_no_given_prefix() throws Exception {21        // given22        ClassLoader cl = isolatedClassLoader().build();23        // when24        cl.loadClass("org.mockito.Mockito");25        // then raises CNFE26    }27    @Test28    public void isolated_class_loader_cannot_load_classes_if_no_code_source_path() throws Exception {29        // given30        ClassLoader cl = isolatedClassLoader()31                .withPrivateCopyOf(CLASS_NAME_DEPENDING_ON_INTERFACE)32                .build();33        // when34        try {35            cl.loadClass(CLASS_NAME_DEPENDING_ON_INTERFACE);36            fail();37        } catch (ClassNotFoundException e) {38            // then39            assertThat(e).hasMessageContaining(CLASS_NAME_DEPENDING_ON_INTERFACE);40        }41    }42    @Test43    public void isolated_class_loader_cannot_load_classes_if_dependent_classes_do_not_match_the_prefixes() throws Exception {44        // given45        ClassLoader cl = isolatedClassLoader()46                .withCurrentCodeSourceUrls()47                .withPrivateCopyOf(CLASS_NAME_DEPENDING_ON_INTERFACE)48                .build();49        // when50        try {51            cl.loadClass(CLASS_NAME_DEPENDING_ON_INTERFACE);52            fail();53        } catch (NoClassDefFoundError e) {54            // then55            assertThat(e).hasMessageContaining("org/mockitoutil/ClassLoadersTest$Interface1");56        }57    }58    @Test59    public void isolated_class_loader_can_load_classes_when_dependent_classes_are_matching_the_prefixes() throws Exception {60        // given61        ClassLoader cl = isolatedClassLoader()62                .withCurrentCodeSourceUrls()63                .withPrivateCopyOf(CLASS_NAME_DEPENDING_ON_INTERFACE)64                .withPrivateCopyOf(INTERFACE_NAME)65                .build();66        // when67        Class<?> aClass = cl.loadClass(CLASS_NAME_DEPENDING_ON_INTERFACE);68        // then69        assertThat(aClass).isNotNull();70        assertThat(aClass.getClassLoader()).isEqualTo(cl);71        assertThat(aClass.getInterfaces()[0].getClassLoader()).isEqualTo(cl);72    }73    @Test74    public void isolated_class_loader_can_load_classes_isolated_classes_in_isolation() throws Exception {75        // given76        ClassLoader cl = isolatedClassLoader()77                .withCurrentCodeSourceUrls()78                .withPrivateCopyOf(ClassLoadersTest.class.getPackage().getName())79                .build();80        // when81        Class<?> aClass = cl.loadClass(AClass.class.getName());82        // then83        assertThat(aClass).isNotNull();84        assertThat(aClass).isNotSameAs(AClass.class);85        assertThat(aClass.getClassLoader()).isEqualTo(cl);86    }87    @Test88    public void isolated_class_loader_cannot_load_classes_if_prefix_excluded() throws Exception {89        // given90        ClassLoader cl = isolatedClassLoader()91                .withCurrentCodeSourceUrls()92                .withPrivateCopyOf(ClassLoadersTest.class.getPackage().getName())93                .without(AClass.class.getName())94                .build();95        // when96        try {97            cl.loadClass(AClass.class.getName());98            fail();99        } catch (ClassNotFoundException e) {100            // then101            assertThat(e).hasMessageContaining("org.mockitoutil")102                         .hasMessageContaining(AClass.class.getName());103        }104    }105    @Test106    public void isolated_class_loader_has_no_parent() throws Exception {107        ClassLoader cl = isolatedClassLoader()108                .withCurrentCodeSourceUrls()109                .withPrivateCopyOf(CLASS_NAME_DEPENDING_ON_INTERFACE)110                .withPrivateCopyOf(INTERFACE_NAME)111                .build();112        assertThat(cl.getParent()).isNull();113    }114    @Test(expected = ClassNotFoundException.class)115    public void excluding_class_loader_cannot_load_classes_when_no_correct_source_url_set() throws Exception {116        // given117        ClassLoader cl = excludingClassLoader()118                .withCodeSourceUrlOf(this.getClass())119                .build();120        // when121        cl.loadClass("org.mockito.Mockito");122        // then class CNFE123    }124    @Test125    public void excluding_class_loader_can_load_classes_when_correct_source_url_set() throws Exception {126        // given127        ClassLoader cl = excludingClassLoader()128                .withCodeSourceUrlOf(Mockito.class)129                .build();130        // when131        cl.loadClass("org.mockito.Mockito");132        // then class successfully loaded133    }134    @Test135    public void excluding_class_loader_cannot_load_class_when_excluded_prefix_match_class_to_load() throws Exception {136        // given137        ClassLoader cl = excludingClassLoader()138                .withCodeSourceUrlOf(Mockito.class)139                .without("org.mockito.BDDMockito")140                .build();141        cl.loadClass("org.mockito.Mockito");142        // when143        try {144            cl.loadClass("org.mockito.BDDMockito");145            fail("should have raise a ClassNotFoundException");146        } catch (ClassNotFoundException e) {147            assertThat(e.getMessage()).contains("org.mockito.BDDMockito");148        }149        // then class successfully loaded150    }151    @Test152    public void can_not_load_a_class_not_previously_registered_in_builder() throws Exception {153        // given154        ClassLoader cl = ClassLoaders155                .inMemoryClassLoader()156                .withClassDefinition("yop.Dude", SimpleClassGenerator.makeMarkerInterface("yop.Dude"))157                .build();158        // when159        try {160            cl.loadClass("not.Defined");161            fail();162        } catch (ClassNotFoundException e) {163            // then164            assertThat(e.getMessage()).contains("not.Defined");165        }166    }167    @Test168    public void can_load_a_class_in_memory_from_bytes() throws Exception {169        // given170        ClassLoader cl = ClassLoaders171                .inMemoryClassLoader()172                .withClassDefinition("yop.Dude", SimpleClassGenerator.makeMarkerInterface("yop.Dude"))173                .build();174        // when175        Class<?> aClass = cl.loadClass("yop.Dude");176        // then177        assertThat(aClass).isNotNull();178        assertThat(aClass.getClassLoader()).isEqualTo(cl);179        assertThat(aClass.getName()).isEqualTo("yop.Dude");180    }181    @Test182    public void cannot_load_a_class_file_not_in_parent() throws Exception {183        // given184        ClassLoader cl = ClassLoaders185                .inMemoryClassLoader()186                .withParent(jdkClassLoader())187                .build();188        cl.loadClass("java.lang.String");189        try {190            // when191            cl.loadClass("org.mockito.Mockito");192            fail("should have not found Mockito class");193        } catch (ClassNotFoundException e) {194            // then195            assertThat(e.getMessage()).contains("org.mockito.Mockito");196        }197    }198    @Test199    public void can_list_all_classes_reachable_in_a_classloader() throws Exception {200        ClassLoader classLoader = ClassLoaders.inMemoryClassLoader()201                                              .withParent(jdkClassLoader())202                                              .withClassDefinition("a.A", SimpleClassGenerator.makeMarkerInterface("a.A"))203                                              .withClassDefinition("a.b.B", SimpleClassGenerator.makeMarkerInterface("a.b.B"))204                                              .withClassDefinition("c.C", SimpleClassGenerator.makeMarkerInterface("c.C"))205//                .withCodeSourceUrlOf(ClassLoaders.class)206                                              .build();207        assertThat(ClassLoaders.in(classLoader).listOwnedClasses()).containsOnly("a.A", "a.b.B", "c.C");208        assertThat(ClassLoaders.in(classLoader).omit("b", "c").listOwnedClasses()).containsOnly("a.A");209    }210    @Test211    public void return_bootstrap_classloader() throws Exception {212        assertThat(jdkClassLoader()).isNotEqualTo(Mockito.class.getClassLoader());213        assertThat(jdkClassLoader()).isNotEqualTo(ClassLoaders.class.getClassLoader());214        assertThat(jdkClassLoader()).isEqualTo(Number.class.getClassLoader());215        assertThat(jdkClassLoader()).isEqualTo(null);216    }217    @Test218    public void return_current_classloader() throws Exception {219        assertThat(currentClassLoader()).isEqualTo(this.getClass().getClassLoader());220    }221    @Test222    public void can_run_in_given_classloader() throws Exception {223        // given224        final ClassLoader cl = isolatedClassLoader()225                .withCurrentCodeSourceUrls()226                .withCodeSourceUrlOf(Assertions.class)227                .withPrivateCopyOf("org.assertj.core")228                .withPrivateCopyOf(ClassLoadersTest.class.getPackage().getName())229                .without(AClass.class.getName())230                .build();231        final AtomicBoolean executed = new AtomicBoolean(false);232        // when233        ClassLoaders.using(cl).execute(new Runnable() {234            @Override235            public void run() {236                assertThat(this.getClass().getClassLoader()).describedAs("runnable is reloaded in given classloader").isEqualTo(cl);237                assertThat(Thread.currentThread().getContextClassLoader()).describedAs("Thread context classloader is using given classloader").isEqualTo(cl);238                try {239                    assertThat(Thread.currentThread()240                                     .getContextClassLoader()241                                     .loadClass("java.lang.String"))242                            .describedAs("can load JDK type")243                            .isNotNull();244                    assertThat(Thread.currentThread()245                                     .getContextClassLoader()246                                     .loadClass("org.mockitoutil.ClassLoadersTest$ClassUsingInterface1"))247                            .describedAs("can load classloader types")248                            .isNotNull();249                } catch (ClassNotFoundException cnfe) {250                    Assertions.fail("should not have raised a CNFE", cnfe);251                }252                executed.set(true);253            }254        });255        // then256        assertThat(executed.get()).isEqualTo(true);257    }258    @Test259    public void cannot_load_runnable_in_given_classloader_if_some_type_cant_be_loaded() throws Exception {260        // given261        final ClassLoader cl = isolatedClassLoader()262                .withCurrentCodeSourceUrls()263                .withPrivateCopyOf(ClassLoadersTest.class.getPackage().getName())264                .without(AClass.class.getName())265                .build();266        // when267        try {268            ClassLoaders.using(cl).execute(new Runnable() {269                @Override270                public void run() {271                    AClass cant_be_found = new AClass();272                }273            });274            Assertions.fail("should have raised a ClassNotFoundException");275        } catch (IllegalStateException ise) {276            // then277            assertThat(ise).hasCauseInstanceOf(NoClassDefFoundError.class)...

ClassLoadersTest

Using AI Code Generation

1    [javac] package org.mockitousage.bugs;2    [javac] import org.mockitoutil.ClassLoadersTest;3    [javac] import org.mockitoutil.ClassLoadersTest.ClassLoaderWithCustomPackage;4    [javac] import org.mockitoutil.ClassLoadersTest.ClassLoaderWithMockitoPackage;5    [javac] import org.mockitoutil.ClassLoadersTest.ClassLoaderWithMockitoPackageAndCustomPackage;6    [javac] import org.mockitoutil.ClassLoadersTest.ClassLoaderWithMockitoPackageAndCustomPackageAndDefaultPackage;

ClassLoadersTest

Using AI Code Generation

1[Mockito/src/test/java/org/mockitoutil/ClassLoadersTest.java](github.com/mockito/mockito/blo...) 2#### [mockito/mockito/blob/3e3b3c3d3a3e1a0a7f9b9c9f9a9a2b2f2a2a8e02/src/test/java/org/mockitoutil/ClassLoadersTest.java#L1-L1](github.com/mockito/mockito/blo...)3      1. package org.mockitoutil;4`[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.8.1:compile (default-compile) on project mockito-core: Compilation failure: Compilation failure:  5[ERROR] /Users/ashishkumar/Downloads/mockito/src/test/java/org/mockito/internal/creation/bytebuddy/ByteBuddyMockMakerTest.java:[21,8] org.mockito.internal.creation.bytebuddy.ByteBuddyMockMakerTest is not abstract and does not override abstract method testClassLoaderIsolated() in org.mockitoutil.ClassLoadersTest  6[ERROR] /Users/ashishkumar/Downloads/mockito/src/test/java/org/mockito/internal/creation/bytebuddy/InlineByteBuddyMockMakerTest.java:[21,8] org.mockito.internal.creation.bytebuddy.InlineByteBuddyMockMakerTest is not abstract and does not override abstract method testClassLoaderIsolated() in org.mockitoutil.ClassLoadersTest

ClassLoadersTest

Using AI Code Generation

1import org.mockitoutil.ClassLoadersTest;2public class ClassLoadersTestDemo {3    public static void main(String[] args) throws Exception {4        ClassLoadersTest classLoadersTest = new ClassLoadersTest();5        Class<?> clazz = classLoadersTest.loadClassFromClasspath("org.mockitoutil.ClassLoadersTest");6        Object object = clazz.newInstance();7        Object result = clazz.getMethod("loadClassFromClasspath", String.class).invoke(object, "java.lang.Object");8        System.out.println(result);9    }10}

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.