How to use ClassLoadersTest class of org.mockitoutil package

Best Mockito code snippet using org.mockitoutil.ClassLoadersTest

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...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)...

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ClassLoadersTest

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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;

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ClassLoadersTest

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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

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ClassLoadersTest

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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}

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MockitoJUnitRunner gives you automatic validation of framework usage, as well as an automatic initMocks().

The automatic validation of framework usage is actually worth having. It gives you better reporting if you make one of these mistakes.

  • You call the static when method, but don't complete the stubbing with a matching thenReturn, thenThrow or then. (Error 1 in the code below)

  • You call verify on a mock, but forget to provide the method call that you are trying to verify. (Error 2 in the code below)

  • You call the when method after doReturn, doThrow or doAnswer and pass a mock, but forget to provide the method that you are trying to stub. (Error 3 in the code below)

If you don't have validation of framework usage, these mistakes are not reported until the following call to a Mockito method. This might be

  • in the same test method (like error 1 below),
  • in the next test method (like error 2 below),
  • in the next test class.

If they occur in the last test that you run (like error 3 below), they won't be reported at all.

Here's how each of those types of errors might look. Assume here that JUnit runs these tests in the order they're listed here.

@Test
public void test1() {

    // ERROR 1
    // This compiles and runs, but it's an invalid use of the framework because 
    // Mockito is still waiting to find out what it should do when myMethod is called.
    // But Mockito can't report it yet, because the call to thenReturn might 
    // be yet to happen.
    when(myMock.method1());

    doSomeTestingStuff();

    // ERROR 1 is reported on the following line, even though it's not the line with
    // the error.
    verify(myMock).method2();

}

@Test
public void test2() {

    doSomeTestingStuff();

    // ERROR 2
    // This compiles and runs, but it's an invalid use of the framework because
    // Mockito doesn't know what method call to verify.  But Mockito can't report 
    // it yet, because the call to the method that's being verified might 
    // be yet to happen.
    verify(myMock);
}

@Test
public void test3() {

    // ERROR 2 is reported on the following line, even though it's not even in 
    // the same test as the error.
    doReturn("Hello").when(myMock).method1();


    // ERROR 3
    // This compiles and runs, but it's an invalid use of the framework because
    // Mockito doesn't know what method call is being stubbed.  But Mockito can't 
    // report it yet, because the call to the method that's being stubbed might 
    // be yet to happen.

    doReturn("World").when(myMock);

    doSomeTestingStuff(); 

    //  ERROR 3 is never reported, because there are no more Mockito calls. 
}

Now when I first wrote this answer more than five years ago, I wrote

So I would recommend the use of the MockitoJUnitRunner wherever possible. However, as Tomasz Nurkiewicz has correctly pointed out, you can't use it if you need another JUnit runner, such as the Spring one.

My recommendation has now changed. The Mockito team have added a new feature since I first wrote this answer. It's a JUnit rule, which performs exactly the same function as the MockitoJUnitRunner. But it's better, because it doesn't preclude the use of other runners.

Include

@Rule 
public MockitoRule rule = MockitoJUnit.rule();

in your test class. This initialises the mocks, and automates the framework validation; just like MockitoJUnitRunner does. But now, you can use SpringJUnit4ClassRunner or any other JUnitRunner as well. From Mockito 2.1.0 onwards, there are additional options that control exactly what kind of problems get reported.

https://stackoverflow.com/questions/10806345/runwithmockitojunitrunner-class-vs-mockitoannotations-initmocksthis

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