How to create a mock database object in PhpUnit?

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To create a mock database object in PhpUnit, you can follow these steps:

1. Install PHPUnit using Composer or your preferred method.

2. Create a stub or mock instance of your database object, using the appropriate PHPUnit methods. For example, if you have a class named Database, you can create a mock object like this:

$mockDatabase = $this->getMockBuilder(Database::class)->getMock();

1. Define the methods and behavior of the mock object as needed. You can do this using PHPUnit's mocking methods, such as expects(), method(), and willReturn(). For example, you can define a mock query() method like this:

$mockDatabase->expects($this->any())
    ->method('query')
    ->willReturn(['result1', 'result2']);

1. Use the mock object wherever you would normally use the real database object in your tests. For example, you can pass the mock object to a constructor or method that requires a database object:

$myObject = new MyClass($mockDatabase);
$myObject->doSomething();

By creating a mock database object in PHPUnit, you can isolate your tests from the actual database and avoid performing costly database operations during testing.