TestMu Conference is Back! Future of Testing + AI LambdaTest G2 Announcement

How to use transform method of org.powermock.core.transformers.javassist.InstrumentMockTransformer class

Best Powermock code snippet using org.powermock.core.transformers.javassist.InstrumentMockTransformer.transform

Source:InstrumentMockTransformerTest.java

...14 *   See the License for the specific language governing permissions and15 *   limitations under the License.16 *17 */18package org.powermock.core.transformers;19import javassist.CannotCompileException;20import javassist.ClassPool;21import javassist.CtClass;22import javassist.CtField;23import javassist.CtMethod;24import javassist.NotFoundException;25import javassist.bytecode.AccessFlag;26import org.junit.Test;27import org.junit.runners.Parameterized;28import org.powermock.core.test.MockClassLoaderFactory;29import org.powermock.core.transformers.javassist.InstrumentMockTransformer;30import org.powermock.core.transformers.mock.MockGatewaySpy;31import powermock.test.support.MainMockTransformerTestSupport.SuperClassWithObjectMethod;32import java.lang.reflect.Field;33import static org.assertj.core.api.Java6Assertions.assertThat;34import static org.powermock.core.test.ClassLoaderTestHelper.runTestWithNewClassLoader;35public class InstrumentMockTransformerTest extends AbstractBaseMockTransformerTest {36    37    private static final String SYNTHETIC_FIELD_VALUE = "Synthetic Field Value";38    39    @Parameterized.Parameters(name = "strategy: {0}, transformer: {1}")40    public static Iterable<Object[]> data() {41        return MockTransformerTestHelper.createTransformerTestData(42            InstrumentMockTransformer.class43        );44    }45    46    public InstrumentMockTransformerTest(final TransformStrategy strategy, final MockTransformerChain mockTransformerChain,47                                         final MockClassLoaderFactory mockClassloaderFactory) {48        super(strategy, mockTransformerChain, mockClassloaderFactory);49    }50    51    @Test52    public void should_ignore_call_to_synthetic_field_when_instrument_call_to_method() throws Throwable {53        final ClassPool classPool = new ClassPool(true);54        CtClass ctClass = prepareClassesForFieldTests(classPool);55        56        mockTransformerChain.transform(wrap(ctClass));57        58        runTestWithNewClassLoader(classPool, ShouldIgnoreCallToSyntheticField.class.getName());59    }60    61    62    private CtClass prepareClassesForFieldTests(ClassPool classPool) throws NotFoundException, CannotCompileException {63        CtClass ctClass = classPool.getCtClass(SuperClassWithObjectMethod.class.getName());64        65        addSyntheticField(classPool, ctClass);66        insertCallSyntheticField(ctClass);67        68        return ctClass;69    }70    ...

Source:InstrumentMockTransformer.java

...14 *   See the License for the specific language governing permissions and15 *   limitations under the License.16 *17 */18package org.powermock.core.transformers.javassist;19import javassist.CannotCompileException;20import javassist.CtClass;21import org.powermock.core.MockGateway;22import org.powermock.core.transformers.TransformStrategy;23import org.powermock.core.transformers.javassist.support.PowerMockExpressionEditor;24import java.io.File;25import java.io.OutputStream;26public class InstrumentMockTransformer extends AbstractJavaAssistMockTransformer {27    28    private Class<?> mockGetawayClass;29    30    public InstrumentMockTransformer(final TransformStrategy strategy) {31        super(strategy);32        this.mockGetawayClass = MockGateway.class;33    }34    35    @Override36    public CtClass transform(final CtClass clazz) throws CannotCompileException {37        clazz.instrument(new PowerMockExpressionEditor(getStrategy(), clazz, mockGetawayClass));38        return clazz;39    }40}...

transform

Using AI Code Generation

1import org.powermock.core.transformers.javassist.InstrumentMockTransformer;2import javassist.ClassPool;3import javassist.CtClass;4import javassist.CtMethod;5import javassist.CtNewMethod;6public class 4 {7    public static void main(String[] args) throws Exception {8        ClassPool pool = ClassPool.getDefault();9        CtClass cc = pool.get("com.rupali.java4");10        CtMethod m = CtNewMethod.make("public int add(int a, int b){return a+b;}", cc);11        cc.addMethod(m);12        byte[] bytes = cc.toBytecode();13        InstrumentMockTransformer instrumentMockTransformer = new InstrumentMockTransformer();14        byte[] bytes1 = instrumentMockTransformer.transform(bytes, "com.rupali.java4");15        System.out.println("bytes1 = " + bytes1);16    }17}18import org.powermock.core.transformers.javassist.InstrumentMockTransformer;19import javassist.ClassPool;20import javassist.CtClass;21import javassist.CtMethod;22import javassist.CtNewMethod;23public class 5 {24    public static void main(String[] args) throws Exception {25        ClassPool pool = ClassPool.getDefault();26        CtClass cc = pool.get("com.rupali.java5");27        CtMethod m = CtNewMethod.make("public int add(int a, int b){return a+b;}", cc);28        cc.addMethod(m);29        byte[] bytes = cc.toBytecode();30        InstrumentMockTransformer instrumentMockTransformer = new InstrumentMockTransformer();31        byte[] bytes1 = instrumentMockTransformer.transform(bytes, "com.rupali.java5");32        System.out.println("bytes1 = " + bytes1);33    }34}35import org.powermock.core.transformers.javassist.InstrumentMockTransformer;36import javassist.ClassPool;37import javassist.CtClass;38import javassist.CtMethod;39import javassist.CtNewMethod;40public class 6 {41    public static void main(String[] args) throws Exception {42        ClassPool pool = ClassPool.getDefault();43        CtClass cc = pool.get("com.rupali.java6");44        CtMethod m = CtNewMethod.make("public int add(int a, int b){return

transform

Using AI Code Generation

1package org.powermock.core.transformers.javassist;2import java.io.File;3import java.io.IOException;4import java.lang.instrument.IllegalClassFormatException;5import java.security.ProtectionDomain;6import org.powermock.core.transformers.MockTransformer;7public class InstrumentMockTransformer implements MockTransformer {8    private final MockTransformer transformer;9    public InstrumentMockTransformer(MockTransformer transformer) {10        this.transformer = transformer;11    }12    public byte[] transform(ClassLoader loader, String className, Class<?> classBeingRedefined,13            ProtectionDomain protectionDomain, byte[] classfileBuffer) throws IllegalClassFormatException {14        try {15            final String name = className.replace('/', '.');16            final File file = new File(name);17            final byte[] transformed = transformer.transform(loader, name, classBeingRedefined, protectionDomain, classfileBuffer);18            return transformed;19        } catch (IOException e) {20            throw new IllegalClassFormatException(e.getMessage());21        }22    }23}24package org.powermock.core.transformers.javassist;25import java.io.File;26import java.io.IOException;27import java.lang.instrument.IllegalClassFormatException;28import java.security.ProtectionDomain;29import org.powermock.core.transformers.MockTransformer;30public class InstrumentMockTransformer implements MockTransformer {31    private final MockTransformer transformer;32    public InstrumentMockTransformer(MockTransformer transformer) {33        this.transformer = transformer;34    }35    public byte[] transform(ClassLoader loader, String className, Class<?> classBeingRedefined,36            ProtectionDomain protectionDomain, byte[] classfileBuffer) throws IllegalClassFormatException {37        try {38            final String name = className.replace('/', '.');39            final File file = new File(name);40            final byte[] transformed = transformer.transform(loader, name, classBeingRedefined, protectionDomain, classfileBuffer);41            return transformed;42        } catch (IOException e) {43            throw new IllegalClassFormatException(e.getMessage());44        }45    }46}47package org.powermock.core.transformers.javassist;48import java.io.File;49import java.io.IOException;50import java.lang.instrument.IllegalClassFormatException;51import java.security.ProtectionDomain;52import org.powermock.core.transformers.MockTransformer;53public class InstrumentMockTransformer implements MockTransformer {

transform

Using AI Code Generation

1package com.example.demo;2import java.lang.instrument.ClassFileTransformer;3import java.lang.instrument.IllegalClassFormatException;4import java.security.ProtectionDomain;5import org.powermock.core.transformers.javassist.InstrumentMockTransformer;6public class MyTransformer implements ClassFileTransformer {7	private static final InstrumentMockTransformer transformer = new InstrumentMockTransformer();8	public byte[] transform(ClassLoader loader, String className, Class<?> classBeingRedefined,9			ProtectionDomain protectionDomain, byte[] classfileBuffer) throws IllegalClassFormatException {10		try {11			return transformer.transform(loader, className, classBeingRedefined, protectionDomain, classfileBuffer);12		} catch (Throwable t) {13			return null;14		}15	}16}17package com.example.demo;18import java.lang.instrument.ClassFileTransformer;19import java.lang.instrument.IllegalClassFormatException;20import java.security.ProtectionDomain;21import org.powermock.core.transformers.javassist.JavassistMockTransformer;22public class MyTransformer implements ClassFileTransformer {23	private static final JavassistMockTransformer transformer = new JavassistMockTransformer();24	public byte[] transform(ClassLoader loader, String className, Class<?> classBeingRedefined,25			ProtectionDomain protectionDomain, byte[] classfileBuffer) throws IllegalClassFormatException {26		try {27			return transformer.transform(loader, className, classBeingRedefined, protectionDomain, classfileBuffer);28		} catch (Throwable t) {29			return null;30		}31	}32}33package com.example.demo;34import java.lang.instrument.ClassFileTransformer;35import java.lang.instrument.IllegalClassFormatException;36import java.security.ProtectionDomain;37import org.powermock.core.transformers.javassist.MethodNameTransformer;38public class MyTransformer implements ClassFileTransformer {39	private static final MethodNameTransformer transformer = new MethodNameTransformer();40	public byte[] transform(ClassLoader loader, String className, Class<?> classBeingRedefined,41			ProtectionDomain protectionDomain, byte[] classfileBuffer) throws IllegalClassFormatException {42		try {43			return transformer.transform(loader, className, classBeingRedefined, protectionDomain, classfileBuffer);44		} catch (Throwable t) {45			return null;46		}47	}48}

transform

Using AI Code Generation

1package org.powermock.core.transformers.javassist;2import java.lang.instrument.IllegalClassFormatException;3import java.security.ProtectionDomain;4import javassist.ClassPool;5import javassist.CtClass;6public class InstrumentMockTransformer {7public static void main(String[] args) {8    try {9        ClassPool pool = ClassPool.getDefault();10        CtClass cc = pool.get("org.powermock.core.transformers.javassist.InstrumentMockTransformer");11        byte[] b = cc.toBytecode();12        InstrumentMockTransformer transformer = new InstrumentMockTransformer();13        byte[] transformed = transformer.transform(null, "org.powermock.core.transformers.javassist.InstrumentMockTransformer", null, null, b);14        System.out.println("Transformed class name: " + new String(transformed));15    } catch (Exception e) {16        e.printStackTrace();17    }18}19public byte[] transform(ClassLoader loader, String className, Class<?> classBeingRedefined, ProtectionDomain protectionDomain, byte[] classfileBuffer) throws IllegalClassFormatException {20    return classfileBuffer;21}22}23import java.lang.instrument.ClassFileTransformer;24import java.lang.instrument.IllegalClassFormatException;25import java.security.ProtectionDomain;26import javassist.ClassPool;27import javassist.CtClass;28import javassist.CtMethod;29import javassist.NotFoundException;30public class InstrumentMockTransformer implements ClassFileTransformer {31    private static final String[] MOCKING_CLASSES = { "org.powermock.api.mockito.PowerMockito", "org.powermock.api.easymock.PowerMock", "org.powermock.api.support.membermodification.MemberModifier" };32    private static final String[] MOCKING_CLASSES_FOR_INSTRUMENTATION = { "org.powermock.api.mockito.internal.mockcreation.MockType", "org.powermock.api.easymock.internal.mockcreation.MockType", "org.powermock.api.support.membermodification.MemberModifier" };33    private static final String[] MOCKING_CLASSES_FOR_INSTRUMENTATION2 = { "org.powermock.api.mockito.internal.mockcreation.MockType", "org.powermock.api.easymock.internal.mockcreation.MockType", "org.powermock.api.support.membermodification.MemberModifier" };34    private static final String[] MOCKING_CLASSES_FOR_INSTRUMENTATION3 = { "org.powermock.api.mockito.internal.mockcreation.MockType", "org.powermock.api.easymock.internal.mockcreation.MockType", "org.powermock.api.support

transform

Using AI Code Generation

1package org.powermock.core.transformers.javassist;2import java.lang.instrument.ClassFileTransformer;3import java.lang.instrument.IllegalClassFormatException;4import java.security.ProtectionDomain;5import javassist.ClassPool;6import javassist.CtClass;7import javassist.LoaderClassPath;8public class InstrumentMockTransformer implements ClassFileTransformer {9    private final ClassLoader classLoader;10    public InstrumentMockTransformer(ClassLoader classLoader) {11        this.classLoader = classLoader;12    }13    public byte[] transform(ClassLoader loader, String className, Class<?> classBeingRedefined,14                            ProtectionDomain protectionDomain, byte[] classfileBuffer) throws IllegalClassFormatException {15        if (loader == null) {16            loader = classLoader;17        }18        try {19            ClassPool classPool = ClassPool.getDefault();20            classPool.appendClassPath(new LoaderClassPath(loader));21            CtClass ctClass = classPool.get(className.replace('/', '.'));22            return ctClass.toBytecode();23        } catch (Throwable t) {24            return null;25        }26    }27}28package org.powermock.core.transformers.javassist;29import java.lang.instrument.ClassFileTransformer;30import java.lang.instrument.IllegalClassFormatException;31import java.security.ProtectionDomain;32import javassist.ClassPool;33import javassist.CtClass;34import javassist.LoaderClassPath;35public class InstrumentMockTransformer implements ClassFileTransformer {36    private final ClassLoader classLoader;37    public InstrumentMockTransformer(ClassLoader classLoader) {38        this.classLoader = classLoader;39    }40    public byte[] transform(ClassLoader loader, String className, Class<?> classBeingRedefined,41                            ProtectionDomain protectionDomain, byte[] classfileBuffer) throws IllegalClassFormatException {42        if (loader == null) {43            loader = classLoader;44        }45        try {46            ClassPool classPool = ClassPool.getDefault();47            classPool.appendClassPath(new LoaderClassPath(loader));48            CtClass ctClass = classPool.get(className.replace('/', '.'));49            return ctClass.toBytecode();50        } catch (Throwable t) {51            return null;52        }53    }54}

transform

Using AI Code Generation

1public class 4 {2    public static void main(String[] args) throws Exception {3        InstrumentMockTransformer transformer = new InstrumentMockTransformer();4        ClassPool classPool = ClassPool.getDefault();5        classPool.insertClassPath(new ClassClassPath(4.class));6        CtClass ctClass = classPool.get("4");7        byte[] transformed = transformer.transform(classPool, ctClass);8        System.out.println("Transformed class: " + new String(transformed));9    }10}11public class 4 {12    public 4() {13        System.out.println("4");14    }15    public static void main(String[] args) throws Exception {16        System.out.println("Transformed class");17    }18}19public class 4 {20    public static void main(String[] args) throws Exception {21        InstrumentMockTransformer transformer = new InstrumentMockTransformer();22        ClassPool classPool = ClassPool.getDefault();23        classPool.insertClassPath(new ClassClassPath(4.class));24        CtClass ctClass = classPool.get("4");25        byte[] transformed = transformer.transform(classPool, ctClass);26        System.out.println("Transformed class: " + new String(transformed));27    }28}29public class 4 {30    public 4() {31        System.out.println("4");32    }33    public static void main(String[] args) throws Exception {34        System.out.println("Transformed class");35    }36}37public class 4 {38    public static void main(String[] args) throws Exception {39        InstrumentMockTransformer transformer = new InstrumentMockTransformer();40        ClassPool classPool = ClassPool.getDefault();41        classPool.insertClassPath(new ClassClassPath(4.class));42        CtClass ctClass = classPool.get("4");43        byte[] transformed = transformer.transform(classPool, ctClass);44        System.out.println("Transformed class: " + new String(transformed));45    }46}47public class 4 {48    public 4() {49        System.out.println("4");50    }51    public static void main(String[] args) throws Exception {52        System.out.println("Transformed class");53    }54}

transform

Using AI Code Generation

1import org.powermock.core.transformers.javassist.InstrumentMockTransformer;2import javassist.ClassPool;3import javassist.CtClass;4public class InstrumentMockTransformerExample {5    public static void main(String[] args) throws Exception {6        ClassPool pool = ClassPool.getDefault();7        CtClass ctClass = pool.get("com.test.powermock.ClassToBeMocked");8        InstrumentMockTransformer transformer = new InstrumentMockTransformer();9        byte[] byteCode = transformer.transform(ctClass.toBytecode());10    }11}12package com.test.powermock;13public class ClassToBeMocked {14    public String methodToBeMocked() {15        return "Hello";16    }17}18package com.test.powermock;19import org.junit.Test;20import org.junit.runner.RunWith;21import org.powermock.api.mockito.PowerMockito;22import org.powermock.core.classloader.annotations.PrepareForTest;23import org.powermock.modules.junit4.PowerMockRunner;24@RunWith(PowerMockRunner.class)25@PrepareForTest(ClassToBeMocked.class)26public class ClassToBeMockedTest {27    public void testMethodToBeMocked() throws Exception {28        PowerMockito.mockStatic(ClassToBeMocked.class);29        PowerMockito.when(ClassToBeMocked.methodToBeMocked()).thenReturn("World");30    }31}

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.