public static void checkCompleted()

in src/main/java/com/spotify/futures/CompletableFuturesExtra.java [180:184]

• 5 lines of code
• 2 McCabe index (conditional complexity)

  public static <T> void checkCompleted(CompletionStage<T> stage) {
    if (!stage.toCompletableFuture().isDone()) {
      throw new IllegalStateException("future was not completed");
    }
  }