public function testGetSetFilenameWithDefaultValue() { $config = new ExportSettings(); $newFilename = 'new_output_filename'; $this->assertNotNull($config->getFilename()); $this->assertNotSame($newFilename, $config->getFilename()); $config->setFilename($newFilename); $this->assertSame($newFilename, $config->getFilename()); }