code: static boolean parseOverallSuccess(SpoonSummary summary) {
      for (DeviceResult result : summary.getResults().values()) {
        if (result.getInstallFailed()) {
          return false; // App and/or test installation failed.
        }
        if (!result.getExceptions().isEmpty() || result.getTestResults().isEmpty()) {
          return false; // Top-level exception present, or no tests were run.
        }
        for (DeviceTestResult methodResult : result.getTestResults().values()) {
          if (methodResult.getStatus() == Status.FAIL) {
            return false; // Individual test failure.
          }
        }
      }
      return true;
    }
docs: Returns {@code false} if a test failed on any device.