// Create a mock object for a User class $userMock = $this->getMockBuilder('User') ->getMock(); // Set a property on the mock object $userMock->name = 'John'; // Test that the property was set correctly $this->assertEquals('John', $userMock->_get('name'));In this example, the developer creates a mock object for a User class, sets a property on the mock object using the _get method, and then tests that the property was set correctly by using the assertEquals method. PHPUnit_Framework_MockObject_MockObject is part of the PHPUnit framework, which is a popular testing library for PHP.