// Backing futures complete
    Boolean booleanPartial = true;
    futureBoolean.set(booleanPartial);
    // Once the backing futures are done there's a (brief) moment where we know nothing
    assertThat(futureResult.toString()).matches("CombinedFuture@\\w+\\[status=PENDING]");
    callableBlocking.countDown();
    // Need to wait for resultFuture to be returned.

    // Backing futures complete
    Boolean booleanPartial = true;
    futureBoolean.set(booleanPartial);
    // Once the backing futures are done there's a (brief) moment where we know nothing
    assertThat(futureResult.toString()).matches("CombinedFuture@\\w+\\[status=PENDING]");
    callableBlocking.countDown();
    // Need to wait for resultFuture to be returned.