In Unit Testing, mocking is the most important part of testing a single unit is that you want to simulate the surrounding around it which is the dependencies of that class.<\/p>\n\n\n\n
For example<\/strong> : If you’re testing a single unit that needs to process some output of a database, you don’t want to perform an actual query on a live database, you’d rather mock the database dependency to make sure that for your test it will always return a certain set of data.<\/p>\n\n\n\n PHP Unit provides multiple methods that will automatically create mock objects which will replace the original object in a unit test.<\/p>\n\n\n\n It uses the getMockBuilder<\/strong> method to create a test double for the specified class. It disabled the constructor of the original class.<\/p>\n\n\n\n The createPartialMock<\/strong> method is very similar to createMock<\/strong> but it lets you specify an array with a subset of methods to be mocked (createMock<\/strong> doesn’t mock any method by default). This is especially useful in Magento 2 when mocking factories since you will need the Similar to createMock<\/strong> but accepts a configuration array with a list of methods and their corresponding return values. Internally, it sets the getMockBuilder will mock the object using its fluent interface.<\/p>\n\n\n\n It uses the getMockBuilder<\/strong> method to create a test double for the specified class. It disables the constructor of the original class and uses for abstract classes or Interfaces.<\/p>\n\n\n\n After mocking we will know how to use the mocked object expects and its return types.<\/p>\n\n\n\n In the above example, the method expects has different types of parameters. It is given below.<\/p>\n\n\n\nBenefits of mock objects<\/h2>\n\n\n\n
<?php\nnamespace namespace Webkul\\UnitTest\\Test\\Unit\\Helper;\n\nclass DataTest extends \\PHPUnit\\Framework\\TestCase\n{\n \/**\n * Set up\n *\n * @return void\n *\/\n protected function setUp(): void\n {\n $this->context = $this->createMock(\n \\Magento\\Framework\\App\\Helper\\Context::class\n );\n }\n}<\/pre>\n\n\n\ncreate<\/code> method of the factory to be mocked.<\/p>\n\n\n\n<?php\nnamespace namespace Webkul\\UnitTest\\Test\\Unit\\Helper;\n\nclass DataTest extends \\PHPUnit\\Framework\\TestCase\n{\n \/**\n * Set up\n *\n * @return void\n *\/\n protected function setUp(): void\n {\n $this->customerMock = $this->getMockBuilder(\n \\Magento\\Customer\\Model\\Customer::class,\n )->setMethods([\n 'setStore',\n 'loadByEmail',\n 'getEntityId',\n 'setPassword',\n 'save'\n ])->disableOriginalConstructor()->getMock();\n \n $this->customerFactoryMock = $this->createPartialMock(\n \\Magento\\Customer\\Model\\CustomerFactory::class,\n ['create']\n );\n $this->customerFactoryMock->expects($this->any())\n ->method('create')\n ->willReturn($this->returnValue($this->customerMock));\n }\n}<\/pre>\n\n\n\nwillReturn<\/code> value for the methods specified.<\/p>\n\n\n\n<?php\nnamespace namespace Webkul\\UnitTest\\Test\\Unit\\Helper;\n\nuse Magento\\Framework\\App\\ResourceConnection;\nuse Magento\\Framework\\DB\\Adapter\\Pdo\\Mysql;\n\nclass DataTest extends \\PHPUnit\\Framework\\TestCase\n{\n \/**\n * @var Mysql|MockObject\n *\/\n private $adapterMock;\n \n \/**\n * Set up\n *\n * @return void\n *\/\n protected function setUp(): void\n {\n $this->adapterMock = $this->createMock(Mysql::class);\n\n $this->resourceConnectionMock = $this->createConfiguredMock(\n ResourceConnection::class,\n [\n 'getConnection' => $this->adapterMock,\n 'getTableName' => self::PREFIXED_TABLE_MEDIA_GALLERY_ASSET\n ]\n );\n }\n}<\/pre>\n\n\n\n<?php\nnamespace namespace Webkul\\UnitTest\\Test\\Unit\\Helper;\n\nclass DataTest extends \\PHPUnit\\Framework\\TestCase\n{\n \/**\n * Set up\n *\n * @return void\n *\/\n protected function setUp(): void\n {\n $this->customerMock = $this->getMockBuilder(\n \\Magento\\Customer\\Model\\Customer::class,\n )->setMethods([\n 'setStore',\n 'loadByEmail',\n 'getEntityId',\n 'setPassword',\n 'save'\n ])->disableOriginalConstructor()->getMock();\n }\n}<\/pre>\n\n\n\n<?php\nnamespace namespace Webkul\\UnitTest\\Test\\Unit\\Helper;\n\nuse Magento\\Store\\Model\\StoreManagerInterface;\n\nclass DataTest extends \\PHPUnit\\Framework\\TestCase\n{\n \/**\n * @var StoreManagerInterface|MockObject\n *\/\n private $storeManager;\n \n \/**\n * Set up\n *\n * @return void\n *\/\n protected function setUp(): void\n {\n $this->storeManager = $this->getMockForAbstractClass(\n StoreManagerInterface::class\n );\n }\n}<\/pre>\n\n\n\n<?php\nnamespace namespace Webkul\\UnitTest\\Test\\Unit\\Helper;\n\nuse Magento\\Store\\Model\\StoreManagerInterface;\n\nclass DataTest extends \\PHPUnit\\Framework\\TestCase\n{\n \/**\n * @var StoreManagerInterface|MockObject\n *\/\n private $storeManager;\n \n \/**\n * Set up\n *\n * @return void\n *\/\n protected function setUp(): void\n {\n $this->storeManager = $this->getMockForAbstractClass(\n StoreManagerInterface::class\n );\n }\n\n public function testUnitTest()\n {\n $this->storeManager->expects($this->any())\n ->method('getStore')->willReturnSelf();\n\n this->storeManager->expects($this->once())\n ->method('getStore')->willReturnSelf();\n\n this->storeManager->expects($this->atLeastOnce())\n ->method('getStore')->willReturnSelf();\n\n this->storeManager->expects($this->exactly(3))\n ->method('getStore')->willReturnSelf();\n\n this->storeManager->expects($this->never())\n ->method('getStore')->willReturnSelf();\n }\n}<\/pre>\n\n\n\n