public function testClear() { $this->directoryWriteMock->expects($this->once())->method('delete')->will($this->returnCallback(['Magento\\Setup\\Test\\Unit\\Model\\WebLoggerTest', 'deleteLog'])); $this->webLogger->log('Message1'); $this->assertEquals('<span class="text-info">Message1</span><br>', self::$log); $this->webLogger->clear(); $this->assertEquals('', self::$log); }