_objectManagerMock = $this->createMock(\Magento\Framework\ObjectManagerInterface::class); $this->_model = new \Magento\Framework\App\ResponseFactory($this->_objectManagerMock); } public function testCreate() { $this->_expectedObject = $this->getMockBuilder(\Magento\Framework\App\ResponseInterface::class)->getMock(); $arguments = [['property' => 'value']]; $this->_objectManagerMock->expects( $this->once() )->method( 'create' )->with( \Magento\Framework\App\ResponseInterface::class, $arguments )->will( $this->returnValue($this->_expectedObject) ); $this->assertEquals($this->_expectedObject, $this->_model->create($arguments)); } }