Bypass for PHP

About

Bypass for PHP provides a quick way to create a custom HTTP Server to return predefined responses to client requests.

This is useful in tests when your application makes requests to external services, and you need to simulate different situations like returning specific data or unexpected server errors.

Just open a Bypass server and configure your application/service to reach Bypass instead of the real-world API end point.

Installation

📌 Bypass requires PHP 8.0+.

To install via composer, run the following command:

composer require --dev ciareis/bypass

Video demo

Pest and Bypass

Writing Tests

🔥 Check out full code examples here section.

1. Open a Bypass Server

To write a test, first open a Bypass server:

//Open a new Bypass server
$bypass = Bypass::open();

Bypass will always run at http://localhost listening to a random port number.

To specify a custom port, just pass it in the argument (int) $port.

//Open a new Bypass using port 8081
$bypass = Bypass::open(8081);

2. Bypass URL and Port

You can retrieve the Bypass server URL using getBaseUrl().

$bypassUrl = $bypass->getBaseUrl(); //http://localhost:16819

If you need to retrieve only the port number, use the getPort() method:

$bypassPort = $bypass->getPort(); //16819

3. Routes

Bypass provides two types of routes: The Standard Route to return a text body content and the File Route, which returns a binary file.

When running your test suit, you should pass the URL created with Bypass to your service. In this way, you will make the service you are testing reach Bypass instead of reaching the real-world API end point.

3.1 Standard Route

use Ciareis\Bypass\Bypass;

//Json body
$body = '{"username": "john", "name": "John Smith", "total": 1250}';

//Route retuning the JSON body with HTTP Status 200
$bypass->addRoute(method: 'GET', uri: '/v1/demo/john', status: 200, body: $body);

//Instantiates a DemoService class
$service = new DemoService();

//Configure your service to access Bypass URL
$response = $service->setBaseUrl($bypass->getBaseUrl())
  ->getTotalByUser('john');

//Your test assertions here...

The method addRoute() accepts the following parameters:

Parameter	Type	Description
HTTP Method	`string $method`	HTTP Request Method (GET/POST/PUT/PATCH/DELETE)
URI	`string $uri`	URI to be served by Bypass
Status	`int $status`	HTTP Status Code to be returned by Bypass (default: 200)
Body	`string\|array $body`	Body to be served by Bypass (optional)
Times	`int $times`	How many times the route should be called (default: 1)

3.2 File Route

use Ciareis\Bypass\Bypass;

//Reads a PDF file
$demoFile = \file_get_contents('storage/pdfs/demo.pdf');

//File Route returning a binary file with HTTP Status 200
$bypass->addFileRoute(method: 'GET', uri: '/v1/myfile', status: 200, file: $demoFile);

//Instantiates a DemoService class
$service = new DemoService();

//Configure your service to access Bypass URL
$response = $service->setBaseUrl($bypass->getBaseUrl())
  ->getPdf();

//Your test assertions here...

The method addFileRoute() accepts the following parameters:

Parameter	Type	Description
HTTP Method	`string $method`	HTTP Request Method (GET/POST/PUT/PATCH/DELETE)
URI	`string $uri`	URI to be served by Bypass
Status	`int $status`	HTTP Status Code to be returned by Bypass (default: 200)
File	`binary $file`	Binary file to be served by Bypass
Times	`int $times`	How many times the route should be called (default: 1)

3.3 Bypass Serve and Route Helpers

Bypass provides you with convenient shortcuts to the most-common-used HTTP requests.

These shortcuts are called "Route Helpers" and are served automatically at a random port using Bypass::serve() without the need to call Bypass::open().

In the next example, Bypasss serves two routes: A URL accessible by method GET returning a JSON body with status 200, and a second route URL accessible by method GET and returning status 404.

use Ciareis\Bypass\Bypass;
use Ciareis\Bypass\Route;

//Create and serve routes
$bypass = Bypass::serve(
  Route::ok(uri: '/v1/demo/john', body: ['username' => 'john', 'name' => 'John Smith', 'total' => 1250]), //method GET, status 200
  Route::notFound(uri: '/v1/demo/wally') //method GET, status 404
);

//Instantiates a DemoService class
$service = new DemoService();
$service->setBaseUrl($bypass->getBaseUrl());

//Consumes the "OK (200)" route
$responseOk = $service->getTotalByUser('john'); //200 - OK with total => 1250

//Consumes the "Not Found (404)" route
$responseNotFound = $service->getTotalByUser('wally'); //404 - Not found

//Your test assertions here...

Route Helpers

You may find below the list of Route Helpers.

Route Helper	Default Method	HTTP Status	Body	Common usage
Route::ok()	GET	200	optional (string\|array)	Request was successful
Route::created()	POST	201	optional (string\|array)	Response to a POST request which resulted in a creation
Route::badRequest()	POST	400	optional (string\|array)	Something can't be parsed (ex: wrong parameter)
Route::unauthorized()	GET	401	optional (string\|array)	Not logged in
Route::forbidden()	GET	403	optional (string\|array)	Logged in but trying to request a restricted resource (without permission)
Route::notFound()	GET	404	optional (string\|array)	URL or resource does not exist
Route::notAllowed()	GET	405	optional (string\|array)	Method not allowed
Route::validationFailed()	POST	422	optional (string\|array)	Data sent does not satisfy validation rules
Route::tooMany()	GET	429	optional (string\|array)	Request rejected due to server limitation
Route::serverError()	GET	500	optional (string\|array)	General indication that something is wrong on the server side

You may also adjust the helpers to your needs by passing arguments:

Parameter	Type	Description
URI	`string $uri`	URI to be served by Bypass
Body	`string\|array $body`	Body to be served by Bypass (optional)
HTTP Method	`string $method`	HTTP Request Method (GET/POST/PUT/PATCH/DELETE)
Times	`int $times`	How many times the route should be called (default: 1)

In the example below, you can see the Helper Route::badRequest using method GET instead of its default method POST.

use Ciareis\Bypass\Bypass;
use Ciareis\Bypass\Route;

Bypass::serve(
  Route::badRequest(uri: '/v1/users?filter=foo', body: ['error' => 'Filter parameter foo is not allowed.'], method: 'GET')
);

📝 Note: Custom routes can be created using a Standard Route in case something you need is not covered by the Helpers.

4. Asserting Route Calling

Sometimes you may need to assert that a route was called at least one or multiple times.

The method assertRoutes() will return a RouteNotCalledException if a route was NOT called as many times as defined in the $times parameter.

If you need to assert that a route is NOT being called by your service, set the parameter $times = 0

//Json body
$body = '{"username": "john", "name": "John Smith", "total": 1250}';

//Defines a route which must be called two times
$bypass->addRoute(method: 'GET', uri: '/v1/demo/john', status: 200, body: $body, times: 2);

//Instantiates a DemoService class
$service = new DemoService();

//Consumes the service using the Bypass URL
$response = $service->setBaseUrl($bypass->getBaseUrl())
  ->getTotalByUser('john');

$bypass->assertRoutes();

//Your test assertions here...

5. Stop or shut down

Bypass will automatically stop its server once your test is done running.

The Bypass server can be stopped or shut down at any point with the following methods:

To stop: $bypass->stop();

To shut down: $bypass->down();

Examples

Use case

To better illustrate Bypass usage, imagine you have to write a test for a service that calculates the total game score of a given username.

The score is obtained by making an external request to a fictitious API at emtudo-games.com/v1/score/::USERNAME::. The API returns HTTP Status 200 and a JSON body with a list of games:

{
  "games": [
    {
      "id": 1,
      "points": 25
    },
    {
      "id": 2,
      "points": 10
    }
  ],
  "is_active": true
}

use Ciareis\Bypass\Bypass;

//Opens a new Bypass server
$bypass = Bypass::open();

//Retrieves the Bypass URL
$bypassUrl = $bypass->getBaseUrl();

//Json body
$body = '{"games":[{"id":1, "name":"game 1","points":25},{"id":2, "name":"game 2","points":10}],"is_active":true}';

//Defines a route
$bypass->addRoute(method: 'GET', uri: '/v1/score/johndoe', status: 200, body: $body);

//Instantiates a TotalScoreService
$service = new TotalScoreService();

//Configure your service to access Bypass URL
$response = $serivce
  ->setBaseUrl($bypassUrl) // set the URL to the Bypass URL
  ->getTotalScoreByUsername('johndoe'); //returns 35

//Pest PHP verifies that response is 35
expect($response)->toBe(35);

//PHPUnit verifies that response is 35
$this->assertSame($response, 35);

Quick Test Examples

Click below to see code snippets for Pest PHP and PHPUnit.

Pest PHP

use Ciareis\Bypass\Bypass;


it('properly returns the total score by username', function () {

  //Opens a new Bypass server
  $bypass = Bypass::open();

  //Json body
  $body = '{"games":[{"id":1, "name":"game 1","points":25},{"id":2, "name":"game 2","points":10}],"is_active":true}';

  //Defines a route
  $bypass->addRoute(method: 'GET', uri: '/v1/score/johndoe', status: 200, body: $body);

  //Configure your service to access Bypass URL
  $service = new TotalScoreService();
  $response = $service
    ->setBaseUrl($bypass->getBaseUrl())
    ->getTotalScoreByUsername('johndoe');

  //Verifies that response is 35
  expect($response)->toBe(35);
});

it('properly gets the logo', function () {

  //Opens a new Bypass server
  $bypass = Bypass::open();

  //Reads the file
  $filePath = 'docs/img/logo.png';
  $file = \file_get_contents($filePath);

  //Defines a route
  $bypass->addFileRoute(method: 'GET', uri: $filePath, status: 200, file: $file);

  //Configure your service to access Bypass URL
  $service = new LogoService();
  $response = $service->setBaseUrl($bypass->getBaseUrl())
    ->getLogo();

  // asserts
  expect($response)->toEqual($file);
});

PHPUnit

use Ciareis\Bypass\Bypass;


class BypassTest extends TestCase
{
  public function test_total_score_by_username(): void
  {
    //Opens a new Bypass server
    $bypass = Bypass::open();

    //Json body
    $body = '{"games":[{"id":1,"name":"game 1","points":25},{"id":2,"name":"game 2","points":10}],"is_active":true}';

    //Defines a route
    $bypass->addRoute(method: 'GET', uri: '/v1/score/johndoe', status: 200, body: $body);

    //Configure your service to access Bypass URL
    $service = new TotalScoreService();
    $response = $service
      ->setBaseUrl($bypass->getBaseUrl())
      ->getTotalScoreByUsername('johndoe');

    //Verifies that response is 35
    $this->assertSame(35, $response);
  }

  public function test_gets_logo(): void
  {
    //Opens a new Bypass server
    $bypass = Bypass::open();

    //Reads the file
    $filePath = 'docs/img/logo.png';
    $file = \file_get_contents($filePath);

    //Defines a route
    $bypass->addFileRoute(method: 'GET', uri: $filePath, status: 200, file: $file);

    //Configure your service to access Bypass URL
    $service = new LogoService();
    $response = $service->setBaseUrl($bypass->getBaseUrl())
      ->getLogo();

    $this->assertSame($response, $file);
  }
}

Test Examples

📚 See Bypass being used in complete tests with Pest PHP and PHPUnit for the GithubRepoService demo service.

Credits

And a special thanks to @DanSysAnalyst

Inspired

Code inspired by Bypass