Ruby Minitest：套件级还是类级设置？

Question

使用内置的 Ruby Minitest 框架，有没有办法在整个套件运行之前运行一些代码，甚至在整个 TestClass 运行之前运行一次？我在this question 的回答中看到 Test::Unit::after_tests 可用于在运行所有测试后运行代码；有没有类似的方法在所有测试都运行之前运行代码？

我想使用此功能在测试运行之前初始化一个测试数据库，并在它们全部运行后将其拆除。

谢谢！

Answer 1

这是从 MiniTest docs 修改而来的（在 Customizable Test Runner Types 下）。

class Burger
  def initialize
    puts "YOU CREATED A BURGER"
  end

  def has_cheese?
    true
  end

  def has_pickle?
    false
  end
end

gem 'minitest'

require 'minitest/unit'
MiniTest::Unit.autorun

class MyMiniTest
  class Unit < MiniTest::Unit

    def before_suites
      # code to run before the first test
      p "Before everything"
    end

    def after_suites
      # code to run after the last test
      p "After everything"
    end

    def _run_suites(suites, type)
      begin
        before_suites
        super(suites, type)
      ensure
        after_suites
      end
    end

    def _run_suite(suite, type)
      begin
        suite.before_suite if suite.respond_to?(:before_suite)
        super(suite, type)
      ensure
        suite.after_suite if suite.respond_to?(:after_suite)
      end
    end

  end
end

MiniTest::Unit.runner = MyMiniTest::Unit.new

class BurgerTest < MiniTest::Unit::TestCase

  def self.before_suite
    p "hi"
  end

  def self.after_suite
    p "bye"
  end

  def setup
    @burger = Burger.new
  end

  def test_has_cheese
    assert_equal true, @burger.has_cheese?
  end

  def test_has_pickle
    assert_equal false, @burger.has_pickle?
  end

end

请注意，我包含 gem 'minitest' 以使用 gem 而不是没有 MiniTest::Unit.runner 方法的捆绑版本。这是输出。

Run options: --seed 49053

# Running tests:

"Before everything"
"hi"
YOU CREATED A BURGER
.YOU CREATED A BURGER
."bye"
"After everything"


Finished tests in 0.000662s, 3021.1480 tests/s, 3021.1480 assertions/s.

2 tests, 2 assertions, 0 failures, 0 errors, 0 skips

所以它调用了两次#setup，但只调用了一次.before_suite 和.after_suite，我想这就是你要找的。​​p>

Answer 2

在 MiniTest 套件中的所有测试运行之前和之后处理时间的另一种方法是将 if 块放在 setup 和 teardown 方法中，以控制这些块只被调用一次。

这样，您可以在测试套件开始时只加载一次浏览器和其他依赖项（例如页面对象），然后在所有测试完成后关闭浏览器。

这是一个使用 MiniTest 5.5.1 和 Watir 的示例：

class CoolTests < Minitest::Test

  @@setupComplete  = false  # tracks whether 1-time setup has completed, so we only instantiate a browser and dependent pages/modules one time per suite run
  @@testsRun       = 0      # tracks how many tests have run so we can close the browser when all tests complete

  def setup                                                    # Minitest#setup runs before every #test method
    @@testsRun+=1                                              # increment tetsRun indicating that a test has run
    if (!@@setupComplete)                                      # we load the browser and necessary page objects here one-time if we haven't already
        @@driver = Watir::Browser.new :chrome                  # instantiate new chrome browser
        @@driver.window.maximize                               # maximize the browser window so we expect to test against Desktop UI/UX rather than Mobile UI/UX
        @@setupComplete = true                                 # setupComplete is now true as we've loaded up everything we need for our tests
    end
  end

  def teardown                                                 # Minitest#teardown runs after every #test method
    if (@@testsRun == CoolTests.runnable_methods.length)   # if we've run all the tests in the suite we are finished and can then close the browser
        @@driver.quit
    end
  end

  #Tests

  def test_one
    p __method__
    @@driver.goto('www.google.com')
    assert_equal 'Google', @@driver.title, 'browser should be at google.com'
  end

  def test_two
    p __method__
    @@driver.goto('www.bing.com')
    assert_equal 'Bing', @@driver.title, 'browser should be at bing.com'
  end