[BDD] 實作 PHP 測試 - Behat + PHPUnit

先來一篇 PHP 的 BDD 測試實作

實作測試環境:

• PHP 7.0.8
• Behat 3.1
• PHPUnit 5.4

實作的檔案及步驟已放在 GitHub - php-bdd-behat-demo

建立 Composer 專案

composer init

它會用問答方式, 請依自己的需求填入相關內容

安裝測試的套件: behat 及 phpunit

composer require behat/behat
composer require phpunit/phpunit

初始 Behat 測試

./vendor/bin/behat --init

執行結果:

+d features - place your *.feature files here
+d features/bootstrap - place your context classes here
+f features/bootstrap/FeatureContext.php - place your definitions, transformations and hooks here

Behat 會自動建立 features/ 資料夾, 並且產生 boostrap/FeatureContext.php

如此已經完成了最基本的測試環境

接下來在 features/ 資料夾新增 *.feature 功能描述檔案

範例: Calculator.feature

Feature: Calculator
    In order to sum up numbers
    As a user
    I should get the result from it

Scenario: Add two numbers
    Given I have entered 50 into the calculator
    And I have entered 70 into the calculator
    When I press add
    Then the result should be 120 on the screen

執行 Behat 測試

./vendor/bin/behat

執行結果:

Feature: Calculator
    In order to sum up numbers
    As a user
    I should get the result from it

  Scenario: Add two numbers                     # features\Calculator.feature:6
    Given I have entered 50 into the calculator
    And I have entered 70 into the calculator
    When I press add
    Then the result should be 120 on the screen

1 scenario (1 undefined)
4 steps (4 undefined)
0m0.58s (5.72Mb)

--- FeatureContext has missing steps. Define them with these snippets:

    /**
     * @Given I have entered :arg1 into the calculator
     */
    public function iHaveEnteredIntoTheCalculator($arg1)
    {
        throw new PendingException();
    }

    /**
     * @When I press add
     */
    public function iPressAdd()
    {
        throw new PendingException();
    }

    /**
     * @Then the result should be :arg1 on the screen
     */
    public function theResultShouldBeOnTheScreen($arg1)
    {
        throw new PendingException();
    }

Behat 自動產生出缺少的步驟程式, 把它複製貼上至 FeatureContext.php 檔裡, 即可繼續開發

接下來的步驟皆是執行 ./vendor/bin/behat , 一邊補齊程式, 直到所有的功能全都符合需求為止

當所有的功能都做完, 全部的文字就會顯示綠色~~ 也就是我們測試說的 綠燈!

測試的步驟, 請參照 GitHub 上的 demo 範例, 自己做過一遍就會有感覺!!