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Work around missing JUnit reporting entry support in Gradle

See original GitHub issue

I tried to get a basic test running with gradle but it seems like jazzer is trying to instrument the gradle workers and fails somewhere.

$ gradle build
INFO: Instrumented org.gradle.api.internal.tasks.testing.processors.DefaultStandardOutputRedirector$DiscardAction with custom hooks only (took 1 ms, size +0%)

> Task :app:test

DummyFuzzTest > dummyFuzz(FuzzedDataProvider) > dummy.DummyFuzzTest.initializationError FAILED
    java.lang.IllegalStateException at
        Caused by: java.lang.reflect.InvocationTargetException at
            Caused by: java.lang.VerifyError at


plugins {
    // Apply the application plugin to add support for building a CLI application in Java.
    id 'application'

repositories {
    // Use Maven Central for resolving dependencies.

dependencies {
    testImplementation 'org.junit.jupiter:junit-jupiter:5.8.2'
    testImplementation 'com.code-intelligence:jazzer-api:0.13.0'
    testImplementation 'com.code-intelligence:jazzer-junit:0.13.0'

application {
    // Define the main class for the application.
    mainClass = 'dummy.App'

tasks.named('test') {
    // Use JUnit Platform for unit tests.

package dummy;

public class App {
    public int add(int a, int b) {
        return a+b;

    public static void main(String[] args) {
        System.out.println(new App().add(1, 2));

package dummy;

import com.code_intelligence.jazzer.api.FuzzedDataProvider;
import com.code_intelligence.jazzer.junit.FuzzTest;

class DummyFuzzTest {
    void dummyFuzz(FuzzedDataProvider data) {
        new App().add(data.consumeInt(), data.consumeInt());

Any idea how to get this running?

Issue Analytics

  • State:open
  • Created a year ago
  • Comments:12 (7 by maintainers)

github_iconTop GitHub Comments

fmeumcommented, Oct 27, 2022

By default, the tests are only run on a fixed set of inputs stored in the src/test/resources/dummy/DummyFuzzTestInputs directory (for your example), plus the empty input. This directory is populated with findings encountered during actual fuzzing runs, which you can start by running the tests with the environment variable JAZZER_FUZZ set to 1. I tried that on your example and got a finding emitted into the directory that I could then reproduce when running the test without JAZZER_FUZZ set.

We actually use JUnit’s reporting entry feature to tell you about all this right in your test logs, which works well with Maven but for some reason doesn’t show up with Gradle.

CodeLowSkycommented, Oct 27, 2022

Attached is the stack trace, thanks for looking into this. In the meanwhile I try the instrument option.


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