RuntimeExceptionThrowingFuture<String> input = new RuntimeExceptionThrowingFuture<>();
    /*
     * RuntimeExceptionThrowingFuture is provably not a ListenableFuture at compile time, so this
     * code may someday upset Error Prone. We want the test, though, in case that changes in the
     * future, so we will suppress any such future Error Prone reports.
     */
    assertWithMessage(

    RuntimeExceptionThrowingFuture<String> input = new RuntimeExceptionThrowingFuture<>();
    /*
     * RuntimeExceptionThrowingFuture is provably not a ListenableFuture at compile time, so this
     * code may someday upset Error Prone. We want the test, though, in case that changes in the
     * future, so we will suppress any such future Error Prone reports.
     */
    assertWithMessage(

            return "cause=[Someday...]";
          }
        };
    AbstractFuture<Object> testFuture3 = new AbstractFuture<Object>() {};
    testFuture3.setFuture(testFuture2);
    assertThat(testFuture3.toString())
        .matches(
            "[^\\[]+\\[status=PENDING, setFuture=\\[[^\\[]+\\[status=PENDING,"
                + " info=\\[cause=\\[Someday...]]]]]");
    testFuture2.set("result string");

            return "cause=[Someday...]";
          }
        };
    AbstractFuture<Object> testFuture3 = new AbstractFuture<Object>() {};
    testFuture3.setFuture(testFuture2);
    assertThat(testFuture3.toString())
        .matches(
            "[^\\[]+\\[status=PENDING, setFuture=\\[[^\\[]+\\[status=PENDING,"
                + " info=\\[cause=\\[Someday...]]]]]");
    testFuture2.set("result string");