jasny / reflection-factory
Abstract factory for PHP Reflection
Installs: 4 970
Dependents: 4
Suggesters: 0
Security: 0
Stars: 2
Watchers: 2
Forks: 0
Open Issues: 0
Requires
- php: >=7.4.0
Requires (Dev)
- jasny/php-code-quality: ~2.7.0
- phpunit/phpunit: ^9.0
This package is auto-updated.
Last update: 2024-10-11 04:30:24 UTC
README
Factory to use in dependency injection when using PHP Reflection.
Why use a factory instead or just doing new ReflectionClass()
?
Dependency injection might seem like making things needlessly complex. However it's a key component in building maintainable (and testable) code.
Using new
within your classes creates a strong coupling between classes. This makes it more difficult when writing
unit tests because there is no opertunity to mock the reflection. In practice this means that a class using
ReflectionClass
can only be tested with real, existing classes.
Using ReflectionFactory
with dependency injection, allows you to inject a mock of the factory instead. This in
term allows you to create mock Reflection objects, for non-existing classes, functions, properties, etc.
Installation
composer require jasny/reflection-factory
Usage
use Jasny\ReflectionFactory\ReflectionFactory; $factory = new ReflectionFactory(); $reflection = $factory->reflectClass(\DateTime::class);
Example use case
Without dependency injection
use Jasny\ReflectionFactory\ReflectionFactory; class SomeTool { public function foo(string $class) { $reflection = new ReflectionClass($class); return $reflection->getConstant('FOO'); } }
But writing the test is hard, as it doesn't allow mocking. Instead we need to create a SomeToolTestFooSupport
class
just to test this feature.
class SomeToolTestFooSupport { const FOO = 10; }
In the unit test we do
use PHPUnit\Framework\TestCase; class SomeToolTest extends TestCase { public function testFoo() { $tool = new SomeTool(); $this->assertEquals(10, $tool->foo("SomeToolTestFooSupport")); } }
Adding one test class isn't so bad. But consider we need to add one per test, it quickly becomes a mess.
With dependency injection
Dependency injection adds a little overhead to the class as we need to pass the reflection factory to SomeTool
.
use Jasny\ReflectionFactory\ReflectionFactoryInterface; class SomeTool { protected $reflectionFactory; public function __construct(ReflectionFactoryInterface $reflectionFactory) { $this->reflectionFactory = $reflectionFactory; } public function foo(string $class) { return $this->reflectionFactory->reflectClass($class)->getConstant('FOO'); } }
In the unit test, we mock the ReflectionClass
and ReflectionFactory
. The tests class FakeClass
doesn't need
to exist.
use PHPUnit\Framework\TestCase; use Jasny\ReflectionFactory\ReflectionFactoryInterface; class SomeToolTest extends TestCase { public function testFoo() { $mockReflection = $this->createMock(\ReflectionClass::class); $mockReflection->expects($this->once())->method('getConstant') ->with('FOO')->willReturn(10); $mockFactory = $this->createMock(ReflectionFactoryInterface::class); $mockFactory->expects($this->once())->method('reflectClass') ->with('FakeClass')->willReturn($mockReflection); $tool = new SomeTool($mockFactory); $this->assertEquals(10, $tool->foo("FakeClass")); } }
Methods
Some PHP functions have been wrapped, so they can be mocked