Behat: Why and How?

Transcript

1. @afilina Behat: Why and How? ConFoo | March 7, 2018

   | Montreal

2. • Project rescue expert. • Dev, mentor, public speaker. •

   Consultant at Zenika. Anna Filina

3. Behavior: does it do what
 the user wants?

4. class CartTest extends TestCase { public function testGetTax() { $mock

   = $this->getMock('Cart',['getTaxRate']); $mock->expects($this->once()) ->method('getTaxRate') ->will($this->returnValue(0.15)); $this->assertEquals(15, $mock->getTax(100)); } }

5. Feature: Cart Items In order to let customers purchase products

   As a developer I need to add items to the shopping cart Background: Given the fixtures file "cart_items.yml" is loaded Scenario: List own cart items Given I send a "GET" request to "/api/users/1/cart" Then the response status code should be 200 And the JSON node "data" should have 2 elements

6. $ vendor/bin/behat Feature: Cart Items In order to let customers

   purchase products As a developer I need to add items to the shopping cart Background: Given the fixtures file "cart_items.yml" is loaded
 Scenario: List own cart items Given I send a "GET" request to "/api/users/1/cart" Then the response status code should be 200 And the JSON node "data" should have 2 elements 1 scenario (1 passed) 4 steps (4 passed) 0m0.31s (29.05Mb)

7. Feature: Cart Items In order to let customers purchase products

   As a developer I need to add items to the shopping cart Background: Given the fixtures file "cart_items.yml" is loaded Scenario: List own cart items Given I send a "GET" request to "/api/users/1/cart" Then the response status code should be 200 And the JSON should be equal to file "users_1_cart.json"

8. /api/users/1/cart { "data": [ { "id": 2, "name": "Product 2",

   "price": 10, "quantity": 2 }, { "id": 1, "name": "Product 1", "price": 10, "quantity": 2 } ] } Backend dev Frontend dev

9. --- Expected +++ Actual @@ @@ "data": [ { "id":

   2, - "name": "Product 2", + "name": "WRONG DATA", "price": 10, "quantity": 2 },

10. More than just
 JSON matching.

11. Scenario: Unauthenticated list Given I send a "GET" request to

    "/api/users/1/cart" Then the response status code should be 401 Scenario: List own cart items Given I add "Authorization" header equal to "Bearer TOKEN_1" And I send a "GET" request to "/api/users/1/cart" Then the response status code should be 200

12. Scenario: List another user's cart items Given I add "Authorization"

    header equal to "Bearer TOKEN_1" And I send a "GET" request to "/api/users/2/cart" Then the response status code should be 403

13. Bug in Mobile App Items GET /api/users/1/cart Authorization: Bearer TOKEN_1

    Cart

14. Background: Given the fixtures file "expired_token.yml" is loaded Scenario: Expired

    token Given I add "Authorization" header equal to "Bearer TOKEN_1" And I send a "GET" request to "/api/users/1/cart" Then the response status code should be 401

15. Scenario: List cart items in French Given I add "Accept-Language"

    header equal to "fr-CA,en;q=0.9"
 And I send a "GET" request to "/api/users/1/cart" Then the response status code should be 200 And the JSON should be equal to file "users_1_cart_fr.json"

16. Scenario: List own cart items Given I add "Authorization" header

    equal to "Bearer TOKEN_1" And I send a "GET" request to "/api/users/1/cart" Then the response status code should be 200 And max 3 queries were executes And query time is under 0.05 seconds

17. I need my API to go faster. How much faster?

    It takes 3s.
 Bring it under 0.5 Got it.

18. Custom Steps

19. Given I add "Authorization" header equal to "Bearer TOKEN_1"
 Given

    I send a "GET" request to "/api/users/1/cart"
 Then the response status code should be 200

20. Given the fixtures file "expired_token.yml" is loaded 
 Then max

    3 queries were executes
 Then query time is under 0.05 seconds

21. class JsonContext extends \Behatch\Context\JsonContext { /** * @Then the JSON

    should be equal to file :filename */ public function theJsonShouldBeEqualToFile(string $filename):void { $actualJson = json_encode( $this->getJson()->getContent(), JSON_PRETTY_PRINT ); $expectedJson = file_get_contents( __DIR__ . '/../../json/'.$filename ); PHPUnit\Framework\Assert::assertJsonStringEqualsJsonString( $expectedJson, $actualJson ); } }

22. /** * @Given the fixtures file :filename is loaded */

    public function loadYamlFixtures(string $filename):void { $loader = new \Nelmio\Alice\Loader\NativeLoader(); $objectSet = $loader->loadFile(__DIR__.'/../../fixtures/'.$filename); foreach ($objectSet->getObjects() as $object) { $className = get_class($object); $this->em->persist($object); } $this->em->flush(); }

23. More than just
 REST APIs.

24. None

25. Feature: Product search Background: Given the fixtures file "products.yml" is

    loaded Scenario: Search existing products Given I am on "/products/Elder+Scrolls" Then the response status code should be 200 And I should see 5 "div.product" elements

26. Feature: Product search Background: Given the fixtures file "products.yml" is

    loaded Scenario: Search existing products Given I am on "/products/Elder+Scrolls" Then the response status code should be 200 And I should see 5 "div.product" elements 1 scenario (1 passed) 4 steps (4 passed) 0m0.28s (29.15Mb)

27. Goutte Web Server Behat Behat
 Goutte Driver Started before tests

28. But my JavaScript!

29. Selenium Browser Behat Behat
 Selenium Driver Selenium Server Started before

    tests Web Server Browser's Driver

30. composer require --dev \ behat/mink-selenium2-driver \
 se/selenium-server-standalone
 
 
 npm

    install chromedriver

31. None

32. @javascript Scenario: Filter products Given I am on "/products" When

    I fill in "search" with "path" Then I should see 1 "div.product.visible" element No :visible pseudoclass

33. Feature: Product search Background: Given the fixtures file "products.yml" is

    loaded @javascript Scenario: Filter products Given I am on "/products" When I fill in "search" with "path" Then I should see 1 "div.product.visible" element 1 scenario (1 passed) 4 steps (4 passed) 0m2.27s (20.53Mb)

34. Browser tests are
 hardest to maintain.

35. • Limit number of browser tests. • Test the JS

    using JS tooling. • Focus on critical path (checkout). Tips

36. Behat can do
 unit tests, but...

37. • Does the app do what the user wants? •

    Useful for "design by contract". • Security, performance, etc. • API, HTML & browser. Takeaways

38. @afilina | afilina.com | youtube.com/c/AnnaFilina