target.clear();
        target.addAll(source);
    }

    /**
     * The set of engines to run with.
     *
     * @see <a href="https://junit.org/junit5/docs/current/user-guide/#launcher-api-engines-custom">Test Engine</a>
     */
    public JUnitPlatformOptions includeEngines(String... includeEngines) {
        this.includeEngines.addAll(Arrays.asList(includeEngines));
        return this;
    }

        headerFiles.addAll(getExecutable().getHeaderFiles());
        headerFiles.addAll(getLibrary().getHeaderFiles());
        return headerFiles;
    }

    @Override
    public List<SourceFile> getSourceFiles() {
        ArrayList<SourceFile> sourceFiles = new ArrayList<SourceFile>();
        sourceFiles.addAll(getExecutable().getSourceFiles());
        sourceFiles.addAll(getLibrary().getSourceFiles());

    }

    @Override
    public void args(List<String> args) {
        this.args.addAll(args);
    }

    @Override
    public List<String> getSystemArgs() {
        return systemArgs;
    }

    @Override
    public void systemArgs(List<String> args) {
       if(!systemArgs.containsAll(args)){
           systemArgs.addAll(args);
       }
    }

    @Override
    public List<String> getAllArgs() {

        this.buildLayoutFactory = buildLayoutFactory;
        allBuildOptions.addAll(new BuildLayoutParametersBuildOptions().getAllOptions());
        allBuildOptions.addAll(new StartParameterBuildOptions().getAllOptions());
        allBuildOptions.addAll(new LoggingConfigurationBuildOptions().getAllOptions()); // TODO maybe a new converter also here
        allBuildOptions.addAll(new WelcomeMessageBuildOptions().getAllOptions()); // TODO maybe a new converter also here

    assertTrue(
        "add(somePresent) should return true", getSet().addAll(MinimalCollection.of(e3(), e0())));
    expectAdded(e3());
  }

  @CollectionFeature.Require(SUPPORTS_ADD)
  public void testAddAll_withDuplicates() {
    MinimalCollection<E> elementsToAdd = MinimalCollection.of(e3(), e4(), e3(), e4());
    assertTrue("add(hasDuplicates) should return true", getSet().addAll(elementsToAdd));
    expectAdded(e3(), e4());
  }

  }

  @CollectionFeature.Require(SUPPORTS_ADD)
  public void testAddAll_emptySet() {
    assertFalse(getMultiset().addAll(Collections.<E>emptySet()));
    expectUnchanged();
  }

  @CollectionFeature.Require(SUPPORTS_ADD)
  public void testAddAll_emptyMultiset() {
    assertFalse(getMultiset().addAll(getSubjectGenerator().create()));
    expectUnchanged();
  }

  @CollectionFeature.Require(SUPPORTS_ADD)

        ImmutableList.Builder<ClasspathEntry> entries = ImmutableList.builder();
        entries.add(createOutput());
        entries.addAll(createSourceFolders());
        entries.addAll(createContainers());
        entries.addAll(createDependencies());
        entries.addAll(createClassFolders());
        return entries.build();
    }

    private ClasspathEntry createOutput() {

            Spec spec = specFrom(provider);
            exportedClasses.addAll(spec.getExportedClasses());
            exportedPackages.addAll(spec.getExportedPackages());
            exportedResources.addAll(spec.getExportedResources());
            exportedResourcePrefixes.addAll(spec.getExportedResourcePrefixes());
        }

        List<File> modulePath = new ArrayList<>();

        if (runAsModule) {
            modulePath.addAll(workerMainClassPath);
        } else {
            classpath.addAll(workerMainClassPath);
        }
        modulePath.addAll(applicationModulePath);
        classpath.addAll(applicationClasspath);

        if (!modulePath.isEmpty() && implementationModulePath != null && !implementationModulePath.isEmpty()) {

                return new DefaultInternalJvmTestRequest(testClass, null, null);
            }
        });
        internalJvmTestRequests.addAll(newRequests);
        testClassNames.addAll(CollectionUtils.toList(testClasses));
        return this;
    }

    @Override
    public TestLauncher withJvmTestMethods(String testClass, String... methods) {