assertEquals("B1", itemList.get(1).getOutputs()[0]);
        assertFalse(itemList.get(1).isUpdated());

        assertEquals(1, itemList.get(2).getInputs().length);
        assertEquals(2, itemList.get(2).getOutputs().length);
        assertEquals("c1", itemList.get(2).getInputs()[0]);
        assertEquals("C1", itemList.get(2).getOutputs()[0]);
        assertEquals("C2", itemList.get(2).getOutputs()[1]);

        assertEquals("a", synonymItem.getInputs()[0]);
        assertEquals("A", synonymItem.getInputs()[1]);
        assertEquals(2, synonymItem.getOutputs().length);
        assertEquals("b", synonymItem.getOutputs()[0]);
        assertEquals("B", synonymItem.getOutputs()[1]);
        assertNull(synonymItem.getNewInputs());
        assertNull(synonymItem.getNewOutputs());
        assertFalse(synonymItem.isUpdated());

    /**
     * Gets the original output synonyms.
     * Returns a defensive copy to prevent external modification.
     *
     * @return The original output synonyms (defensive copy).
     */
    public String[] getOutputs() {
        return outputs == null ? null : outputs.clone();
    }

    /**
     * Gets the output synonyms as a newline-separated string.
     *
     * @return The output synonyms as a string.
     */

    }

    private Object distTaskOutput(TaskProvider<Task> buildDistTask) {
        return new Callable<File>() {
            @Override
            public File call() {
                return buildDistTask.get().getOutputs().getFiles().getSingleFile();
            }

            @Override
            public String toString() {
                return call().getAbsolutePath();
            }
        };
    }

            c.getInputs().file(new File(project.getBuildDir(), "refspec"));
            if (useNativeExpanded) {
                c.getOutputs().dir(expectedOutputFile);
            } else {
                c.getOutputs().files(expectedOutputFile);
            }
            c.getOutputs().cacheIf("BWC distribution caching is disabled on 'master' branch", task -> {
                String gitBranch = System.getenv("GIT_BRANCH");

        TaskProvider<Task> copyCheckstyleConf = project.getTasks().register("copyCheckstyleConf");

        // configure inputs and outputs so up to date works properly
        copyCheckstyleConf.configure(t -> t.getOutputs().files(checkstyleSuppressions, checkstyleConf));
        if ("jar".equals(checkstyleConfUrl.getProtocol())) {
            try {

            DirectoryProperty generatedJavadocDirectory = project.getObjects().directoryProperty();
            generatedJavadocDirectory.set(layout.getBuildDirectory().dir("javadoc"));
            task.getOutputs().dir(generatedJavadocDirectory);
            task.getExtensions().getExtraProperties().set("destinationDirectory", generatedJavadocDirectory);
            // TODO: This breaks the provider

            // Only run tests for the current architecture
            t.onlyIf(t3 -> distribution.getArchitecture() == Architecture.current());
            t.getOutputs().doNotCacheIf("Build cache is disabled for packaging tests", Specs.satisfyAll());
            t.setMaxParallelForks(1);
            t.setWorkingDir(project.getProjectDir());

            DirectoryProperty flattenedAsciidocDirectory = project.getObjects().directoryProperty();
            flattenedAsciidocDirectory.set(extension.getUserManual().getStagingRoot().dir("raw"));
            task.getOutputs().dir(flattenedAsciidocDirectory);
            task.getExtensions().getExtraProperties().set("destinationDirectory", flattenedAsciidocDirectory);
            task.into(flattenedAsciidocDirectory);
        });

        thread.start();

        Thread.sleep(50);

        String output1 = thread.getOutput();
        boolean contains1 = thread.contains("concurrent1");

        thread.join(1000);

        String output2 = thread.getOutput();
        boolean contains2 = thread.contains("concurrent1");

        assertNotNull(output1);
        assertNotNull(output2);