Static method mocking with Mockito 1.9.5 and Powermock fails with Java 8 Consumer Interface

[johanhaleby]

What steps will reproduce the problem?
Create class that implements Consumer interface (ie IntConsumer):

import java.io.PrintStream;
import java.util.function.IntConsumer;
import java.util.stream.IntStream;

public class FizzBuzz implements IntConsumer {

    public static boolean isFizz(int i) {
        return i % 5 == 0;
    }

    public static void run(PrintStream outputStream, int max) {
        IntStream.range(0, max).forEach(new FizzBuzz());
    }

    @Override
    public void accept(int value) {

    }
}

Create test case that does:

@RunWith(PowerMockRunner.class)
@PrepareForTest(FizzBuzz.class)
public class FizzBuzzTest extends TestCase {

    public static final int ANY_NUMBER = 5;

    public void testFizzOnThreeShouldReturnFalse() {
        Assert.assertThat(FizzBuzz.isFizz(3), is(false));
    }

    public void testFizzOnFiveShouldReturnTrue() {
        Assert.assertThat(FizzBuzz.isFizz(5), is(true));
    }

    @Test
    public void acceptOutputsFizzForFizz() {
        PrintStream stream = mock(PrintStream.class);

        PowerMockito.mockStatic(FizzBuzz.class);
        Mockito.when(FizzBuzz.isFizz(ANY_NUMBER)).thenReturn(true);

        new FizzBuzz().accept(ANY_NUMBER);

        Mockito.verify(stream, times(10)).println("fizz");
    }
}

What is the expected output?

Unsatisfied invocation, as there is no implementation in that method that is being tested yet...

This works when you remove the 'implements IntConsumer' from the implementation. It also seems to fail on the @PrepareForTest(FizzBuzz.class) part.

What do you see instead?

/Library/Java/JavaVirtualMachines/jdk1.8.0.jdk/Contents/Home/bin/java -ea -Didea.launcher.port=7543 "-Didea.launcher.bin.path=/Applications/IntelliJ IDEA 13.app/bin" -Dfile.encoding=UTF-8 -classpath "/Applications/IntelliJ IDEA 13.app/lib/idea_rt.jar:/Applications/IntelliJ IDEA 13.app/plugins/junit/lib/junit-rt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0.jdk/Contents/Home/lib/ant-javafx.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0.jdk/Contents/Home/lib/dt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0.jdk/Contents/Home/lib/javafx-mx.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0.jdk/Contents/Home/lib/jconsole.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0.jdk/Contents/Home/lib/sa-jdi.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0.jdk/Contents/Home/lib/tools.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0.jdk/Contents/Home/jre/lib/charsets.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0.jdk/Contents/Home/jre/lib/deploy.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0.jdk/Contents/Home/jre/lib/htmlconverter.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0.jdk/Contents/Home/jre/lib/javaws.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0.jdk/Contents/Home/jre/lib/jce.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0.jdk/Contents/Home/jre/lib/jfr.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0.jdk/Contents/Home/jre/lib/jfxswt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0.jdk/Contents/Home/jre/lib/jsse.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0.jdk/Contents/Home/jre/lib/management-agent.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0.jdk/Contents/Home/jre/lib/plugin.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0.jdk/Contents/Home/jre/lib/resources.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0.jdk/Contents/Home/jre/lib/rt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0.jdk/Contents/Home/jre/lib/ext/cldrdata.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0.jdk/Contents/Home/jre/lib/ext/dnsns.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0.jdk/Contents/Home/jre/lib/ext/jfxrt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0.jdk/Contents/Home/jre/lib/ext/localedata.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0.jdk/Contents/Home/jre/lib/ext/nashorn.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0.jdk/Contents/Home/jre/lib/ext/sunec.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0.jdk/Contents/Home/jre/lib/ext/sunjce_provider.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0.jdk/Contents/Home/jre/lib/ext/sunpkcs11.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0.jdk/Contents/Home/jre/lib/ext/zipfs.jar:/Users/shendriks/projects/katas/fizzbuzz/java/target/test-classes:/Users/shendriks/projects/katas/fizzbuzz/java/target/classes:/Users/shendriks/.m2/repository/junit/junit/4.8.2/junit-4.8.2.jar:/Users/shendriks/.m2/repository/org/hamcrest/hamcrest-all/1.3/hamcrest-all-1.3.jar:/Users/shendriks/.m2/repository/org/mockito/mockito-all/1.9.5/mockito-all-1.9.5.jar:/Users/shendriks/.m2/repository/org/powermock/powermock-module-junit4/1.5.4/powermock-module-junit4-1.5.4.jar:/Users/shendriks/.m2/repository/org/powermock/powermock-module-junit4-common/1.5.4/powermock-module-junit4-common-1.5.4.jar:/Users/shendriks/.m2/repository/org/powermock/powermock-core/1.5.4/powermock-core-1.5.4.jar:/Users/shendriks/.m2/repository/org/powermock/powermock-reflect/1.5.4/powermock-reflect-1.5.4.jar:/Users/shendriks/.m2/repository/org/objenesis/objenesis/2.1/objenesis-2.1.jar:/Users/shendriks/.m2/repository/org/javassist/javassist/3.18.1-GA/javassist-3.18.1-GA.jar:/Users/shendriks/.m2/repository/org/powermock/powermock-api-mockito/1.5.4/powermock-api-mockito-1.5.4.jar:/Users/shendriks/.m2/repository/org/powermock/powermock-api-support/1.5.4/powermock-api-support-1.5.4.jar" com.intellij.rt.execution.application.AppMain com.intellij.rt.execution.junit.JUnitStarter -ideVersion5 com.fundynamic.katas.FizzBuzzTest
Internal Error occured.
java.lang.IllegalStateException: Failed to transform class with name com.fundynamic.katas.FizzBuzz. Reason: javassist.bytecode.InterfaceMethodrefInfo cannot be cast to javassist.bytecode.MethodrefInfo
at org.powermock.core.classloader.MockClassLoader.loadMockClass(MockClassLoader.java:214)
at org.powermock.core.classloader.MockClassLoader.loadModifiedClass(MockClassLoader.java:144)
at org.powermock.core.classloader.DeferSupportingClassLoader.loadClass(DeferSupportingClassLoader.java:67)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:340)
at sun.reflect.generics.factory.CoreReflectionFactory.makeNamedType(CoreReflectionFactory.java:114)
at sun.reflect.generics.visitor.Reifier.visitClassTypeSignature(Reifier.java:125)
at sun.reflect.generics.tree.ClassTypeSignature.accept(ClassTypeSignature.java:49)
at sun.reflect.annotation.AnnotationParser.parseSig(AnnotationParser.java:439)
at sun.reflect.annotation.AnnotationParser.parseClassValue(AnnotationParser.java:420)
at sun.reflect.annotation.AnnotationParser.parseClassArray(AnnotationParser.java:724)
at sun.reflect.annotation.AnnotationParser.parseArray(AnnotationParser.java:531)
at sun.reflect.annotation.AnnotationParser.parseMemberValue(AnnotationParser.java:355)
at sun.reflect.annotation.AnnotationParser.parseAnnotation2(AnnotationParser.java:286)
at sun.reflect.annotation.AnnotationParser.parseAnnotations2(AnnotationParser.java...

[johanhaleby]

From johan.ha...@gmail.com on March 25, 2014 04:15:50

I don't think Javassist has support for Java 8 yet. Please report to Javassist as well.

Status: Accepted

[johanhaleby]

From stefanhe...@gmail.com on March 26, 2014 13:12:27

Done at Javassist - https://issues.jboss.org/browse/JASSIST-220