assertEquals(2, callbackResults.size());
        assertEquals("integration test", callbackResults.get(0));
        assertEquals("second line", callbackResults.get(1));

        String output = thread.getOutput();
        assertTrue(output.contains("integration test"));
        assertTrue(output.contains("second line"));
    }

    @Test
    public void test_defaultBufferSizeConstant() throws IOException {

        yamlTestSourceSet.getOutput()
            .dir(
                project.getTasks()
                    .withType(CopyRestApiTask.class)
                    .named(RestResourcesPlugin.COPY_REST_API_SPECS_TASK)
                    .flatMap(CopyRestApiTask::getOutputResourceDir)
            );

        yamlTestSourceSet.getOutput()
            .dir(
                project.getTasks()

        BuildResult result = getGradleRunner().withArguments(":launchReaper", "-S", "--info").build();
        assertTaskSuccessful(result, ":launchReaper");
        assertOutputContains(result.getOutput(), "Copying reaper.jar...");
    }

                        .findFirst()
                        .orElse(null)
                );
            });

        defaultSourceSet.getOutput().dir(copyRestYamlApiTask.map(CopyRestApiTask::getOutputResourceDir));
        defaultSourceSet.getOutput().dir(copyRestYamlTestTask.map(CopyRestTestsTask::getOutputResourceDir));
    }

                yamlTestSourceSet.getOutput().getClassesDirs().plus(yamlCompatTestSourceSet.getOutput().getClassesDirs())
            );
            testTask.setClasspath(
                yamlCompatTestSourceSet.getRuntimeClasspath()
                    // remove the "normal" api and tests
                    .minus(project.files(yamlTestSourceSet.getOutput().getResourcesDir()))

        assertEquals("line1 line2", item.getOutput());
    }

    @Test
    public void test_constructor_withNullOutput() {
        // Test with null output
        String[] inputs = { "input" };
        CharMappingItem item = new CharMappingItem(1L, inputs, null);

        assertNull(item.getOutput());
    }

    @Test
    public void test_constructor_withUnsortedInputs() {

    }

    @ParametricNullness
    abstract T getOutput(int entry);

    @Override
    @ParametricNullness
    public T next() {
      checkForConcurrentModification();
      if (!hasNext()) {
        throw new NoSuchElementException();
      }
      indexToRemove = currentIndex;
      T result = getOutput(currentIndex);
      currentIndex = getSuccessor(currentIndex);

            }

            @Override
            public InputStream getInput() throws CIFSException {
                return null;
            }

            @Override
            public OutputStream getOutput() throws CIFSException {
                return null;
            }

            @Override
            public boolean isOpen() {
                return false;
            }

            @Override

                sourceSet -> sourceSet.getName().equals(SourceSet.MAIN_SOURCE_SET_NAME)
                    || sourceSet.getName().equals(SourceSet.TEST_SOURCE_SET_NAME)
            )
            .map(sourceSet -> sourceSet.getOutput().getClassesDirs())
            .reduce(FileCollection::plus)
            .orElse(getProject().files())
            .filter(File::exists);
    }

     */
    public String getInput() {
        return input;
    }

    /**
     * Gets the original output stem.
     *
     * @return The original output stem.
     */
    public String getOutput() {
        return output;
    }

    /**
     * Checks if the item has been updated.
     *
     * @return true if the item has been updated, false otherwise.
     */