subject = $this->getMockBuilder(\Magento\SalesRule\Model\Rule::class) ->disableOriginalConstructor() ->getMock(); $this->genericClosure = function () { return; }; $this->plugin = $objectManager->getObject(\Magento\SalesRule\Model\Plugin\Rule::class); } public function testLoadRelations() { $this->assertEquals( $this->subject, $this->plugin->aroundLoadRelations($this->subject, $this->genericClosure) ); } }