assertThat(cause)
          .hasMessageThat()
          .contains(
              "AsyncFunction.apply returned null instead of a Future. "
                  + "Did you mean to return immediateFuture(null)?");
    }
  }

  @J2ktIncompatible
  @GwtIncompatible // threads
  public void testCatchingAsync_interruptPropagatesToTransformingThread() throws Exception {

    /** The key of the message: {item} is invalid {type} barcode. */
    public static final String CONSTRAINTS_EAN_MESSAGE = "{constraints.EAN.message}";

    /** The key of the message: {item} is not a well-formed email address. */
    public static final String CONSTRAINTS_Email_MESSAGE = "{constraints.Email.message}";

      assertThat(cause)
          .hasMessageThat()
          .contains(
              "AsyncFunction.apply returned null instead of a Future. "
                  + "Did you mean to return immediateFuture(null)?");
    }
  }

  @J2ktIncompatible
  @GwtIncompatible // threads
  public void testCatchingAsync_interruptPropagatesToTransformingThread() throws Exception {