### Question:
ThreadRecorder implements Recorder { @Nullable @Override public <T> T record( @NonNull ExecutionType executionType, @NonNull String projectPath, @Nullable String variant, @NonNull Block<T> block) { return record(executionType, null, projectPath, variant, block); }  static Recorder get(); @Nullable @Override T record(
            @NonNull ExecutionType executionType,
            @NonNull String projectPath,
            @Nullable String variant,
            @NonNull Block<T> block); @Override void record(
            @NonNull ExecutionType executionType,
            @NonNull String projectPath,
            @Nullable String variant,
            @NonNull VoidBlock block); @Nullable @Override T record(
            @NonNull ExecutionType executionType,
            @Nullable GradleTransformExecution transform,
            @NonNull String projectPath,
            @Nullable String variant,
            @NonNull Block<T> block);  }### Answer:
@Test public void testBasicTracing() { Integer value = threadRecorder.record(ExecutionType.SOME_RANDOM_PROCESSING, ":projectName", null, () -> 10); Assert.assertNotNull(value); Assert.assertEquals(10, value.intValue()); }
@Test public void testBlocks() { Integer value = threadRecorder.record(ExecutionType.SOME_RANDOM_PROCESSING, ":projectName", null, () -> threadRecorder.record( ExecutionType.SOME_RANDOM_PROCESSING, ":projectName", null, () -> 10)); Assert.assertNotNull(value); Assert.assertEquals(10, value.intValue()); }
@Test public void testExceptionPropagation() { final Exception toBeThrown = new Exception("random"); try { threadRecorder.record(ExecutionType.SOME_RANDOM_PROCESSING, ":projectName", null, new Recorder.Block<Integer>() { @Override public Integer call() throws Exception { throw toBeThrown; } }); } catch (Exception e) { Assert.assertEquals(toBeThrown, e.getCause()); return; } Assert.fail("Exception not propagated."); }
@Test public void testVoidBlockExceptionPropagation() { final IOException toBeThrown = new IOException("random"); try { threadRecorder.record(ExecutionType.SOME_RANDOM_PROCESSING, ":projectName", null, (Recorder.VoidBlock) () -> {throw toBeThrown;}); } catch (UncheckedIOException e) { Assert.assertEquals(toBeThrown, e.getCause()); return; } Assert.fail("Exception not propagated."); }