Ray.TestDouble

An AOP powered test double library for PHP

Installation

Composer install

$ composer require ray/test-double --dev

What is Spy?

A Spy is a test double that records every invocation made against it and can verify certain interactions took place after the fact.

Create Spy

You can do it directly with newInstance or specify it with a binding.

By newInstance()

$spyLog = new SpyLog();
$spy = (new Spy())->newInstance(Foo::class, 'add', $spyLog);
// $spy records the 'add' method call

By SpyModule

Specify the target to spy on by interface or class name.

$injector = new Injector(new class extends AbstractModule{
        protected function configure(): void
        {
            $spyTargets = [
                FooInterface::class,
            ];
            $this->install(new SpyModule($spyTargets));
        }
    }
);
$spy = $injector->getInstance(Foo::class);

By Matcher

Specify the spying target using the Ray.Aop matcher.

$injector = new Injector(new class extends AbstractModule
{
    protected function configure(): void
    {
        $this->install(new SpyBaseModule());
        $this->bindInterceptor(
            $this->matcher->any(),             // any class
            $this->matcher->startsWith('add'), // methods startWith 'add'
            [SpyInterceptor::class]
        );
    }
});
$fake = $injector->getInstance(FakeAdd::class);
$spy = $injector->getInstance(Foo::class);

Assertion

SpyLog::get($className, $methodName) to get the log and make assertions.

public function testSpy()
{
    $result = $foo->add(1, 2); // 3
    $spy = $injector->getInstance(Spy::class);
    // @var array<int, Log> $addLog
    $addLog = $spyLog->getLogs(FakeAdd::class, 'add');   
    $subLog = $spyLog->getLogs(FakeAdd::class, 'sub');   

    $this->assertSame(1, count($addLog), 'Should have received once');
    $this->assertSame(0, count($subLog), 'Should have not received');
    $this->assertSame([1, 2], $addLog[0]->arguments);
    $this->assertSame(1, $addLog[0]->namedArguments['a']);

}