messageFactoryMock = $this->createPartialMock( \Magento\Framework\Message\Factory::class, ['create'] ); $this->exceptionMessageFactory = new \Magento\Framework\Message\ExceptionMessageFactory( $this->messageFactoryMock ); } public function testCreateMessageDefaultType() { $exception = new \Exception('message'); $message = $this->createMock(MessageInterface::class); $message->expects($this->once()) ->method('setText') ->with($exception->getMessage()) ->willReturn($message); $this->messageFactoryMock->expects($this->once()) ->method('create') ->with(MessageInterface::TYPE_ERROR) ->willReturn($message); $this->assertEquals( $message, $this->exceptionMessageFactory->createMessage($exception) ); } }