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Minimal test - lines (21, 88)

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class nsPrintSettingsService : public nsIPrintSettingsService {
 public:
  NS_DECL_ISUPPORTS
  NS_DECL_NSIPRINTSETTINGSSERVICE

  nsPrintSettingsService() = default;

  /**
   * method Init
   *  Initializes member variables. Every consumer that does manual
   *  creation (instead of do_CreateInstance) needs to call this method
   *  immediately after instantiation.
   */
  virtual nsresult Init();

 private:
  // Copying is not supported.
  nsPrintSettingsService(const nsPrintSettingsService& x) = delete;
  nsPrintSettingsService& operator=(const nsPrintSettingsService& x) = delete;

 protected:
  virtual ~nsPrintSettingsService() = default;

  void ReadBitFieldPref(const char* aPrefId, int32_t anOption);
  void WriteBitFieldPref(const char* aPrefId, int32_t anOption);
  void ReadJustification(const char* aPrefId, int16_t& aJust,
                         int16_t aInitValue);
  void WriteJustification(const char* aPrefId, int16_t aJust);
  void ReadInchesToTwipsPref(const char* aPrefId, int32_t& aTwips,
                             const char* aMarginPref);
  void WriteInchesFromTwipsPref(const char* aPrefId, int32_t aTwips);
  void ReadInchesIntToTwipsPref(const char* aPrefId, int32_t& aTwips,
                                const char* aMarginPref);
  void WriteInchesIntFromTwipsPref(const char* aPrefId, int32_t aTwips);

  nsresult ReadPrefDouble(const char* aPrefId, double& aVal);
  nsresult WritePrefDouble(const char* aPrefId, double aVal);

  /**
   * method ReadPrefs
   * @param aPS          a pointer to the printer settings
   * @param aPrinterName the name of the printer for which to read prefs
   * @param aFlags       flag specifying which prefs to read
   */
  virtual nsresult ReadPrefs(nsIPrintSettings* aPS,
                             const nsAString& aPrinterName, uint32_t aFlags);
  /**
   * method WritePrefs
   * @param aPS          a pointer to the printer settings
   * @param aPrinterName the name of the printer for which to write prefs
   * @param aFlags       flag specifying which prefs to read
   */
  virtual nsresult WritePrefs(nsIPrintSettings* aPS,
                              const nsAString& aPrinterName, uint32_t aFlags);

  const char* GetPrefName(const char* aPrefName, const nsAString& aPrinterName);

  /**
   * method _CreatePrintSettings
   *   May be implemented by the platform-specific derived class
   *
   * @return             printer settings instance
   */
  virtual nsresult _CreatePrintSettings(nsIPrintSettings** _retval) = 0;

  // Members
  nsCString mPrefName;
};