logger = new NullLogger; } public function testNullLoggerIgnoresInfo() { $this->assertNull($this->logger->log('foo')); } public function testNullLoggerIgnoresDebug() { $this->assertNull($this->logger->debug('foo')); } public function testNullLoggerIgnoresWarning() { $this->assertNull($this->logger->warning('foo')); } public function testNullLoggerIgnoresErro() { $this->assertNull($this->logger->error('foo')); } }