public function testGetFileNames() { $so = new \PaulJulio\SettingsIni\SettingsSO(); $this->assertSame([], $so->getSettingsFileNames()); $sor = new ReflectionClass($so); $sorp = $sor->getProperty('settingsFileNames'); $sorp->setAccessible(true); $sorp->setValue($so, ['test value']); $this->assertSame(['test value'], $so->getSettingsFileNames()); }