### Question:
ProjectSettingsServiceImpl implements ProjectSettingsService { @Override public void addProperty(final String key, final String value, final boolean force) { getPropFilesManager().addPropertyIfNotExists( LogicalPath.getInstance(PROJECT_CONFIG_FOLDER_LOCATION, ""), getProjectSettingsFileName(), key, value, force); }  @Override void addProperty(final String key, final String value, final boolean force); @Override void removeProperty(final String key); @Override Map<String, String> getProperties(); @Override SortedSet<String> getPropertyKeys(boolean includeValues); @Override String getProperty(final String key); @Override Boolean getBooleanProperty(String key, Boolean defaultValue); @Override String getProjectSettingsLocation(); @Override boolean existsProjectSettingsFile(); @Override void createProjectSettingsFile(); PropFilesManagerService getPropFilesManager(); FileManager getFileManager();  }### Answer:
@Test public void testAddProperty() { }