public function testWriteFail()
 {
     $provider = $this->getMockBuilder(FilesystemProvider::class)->getMock();
     $provider->method('read')->willReturnOnConsecutiveCalls("Invalid configuration (not an array or an object.");
     $configuration = new Configuration();
     $configuration->setProvider($provider);
     $this->setExpectedException(\RuntimeException::class);
     $configuration->set(FilesystemProviderTest::CONFIG_EXISTING, '[restaurants][Na Urale][display]', false);
 }