红宝石测试方法的覆盖检测

Question

如果您编写一个测试类，如

class MyTest < Test::Unit::TestCase 
  def setup 
  end

  def test_1 
    flunk
  end

  def test_1 
    assert true
  end
end

第一个test_1被忽略。虽然这看起来是个愚蠢的错误，但它可能发生在复制和粘贴编程中。除了跑步

grep test test_me.rb | wc

与有多少测试单元表示已经运行，或者使用rcov或heckle，或者使用-w运行的测试单元相比，如何才能检测到这些问题？

另外，是否有任何方法来指定不应该覆盖测试方法？

编辑：正在测试的方法有一个参数，其值为6个左右，测试人员希望测试每个场景。这就是为什么使用复制和粘贴编程。对于这种情况，我能设想的唯一选择是一个参数和期望值的六元素数组。

Answer 1

您可以利用Ruby的method_added，只要将方法添加到类中，就会调用它。您应该能够将某些内容放入您包含的模块中，但这里有一个在测试类中执行该操作的简单示例。

class MyTest < Test::Unit::TestCase

  @@my_tests = []

  def self.method_added(sym)
    raise "#{sym} already defined!" if @@my_tests.include? sym
    @my_tests << sym
  end

  def test_foo_1
  end

  def test_foo_2
  end

  def test_foo_1
  end
end

Answer 2

编辑:正在测试的方法有一个参数，有大约6个可能的值，测试人员希望测试每个场景。这就是为什么使用复制和粘贴编程。

在这种情况下，我这样做：

def test_foo
  test_cases = [
   {:param => 1, :expected => 'whatever is expected'},
   {:param => 2, :expected => 'whatever is expected'},
   {:param => 3, :expected => 'whatever is expected'},
   {:param => 4, :expected => 'whatever is expected'},
   {:param => 5, :expected => 'whatever is expected'},
   {:param => 6, :expected => 'whatever is expected'}
  ]

  for test_case in test_cases
    do_the_test(test_case)
  end
end

def do_the_test(test_case)
  # test code here
end

这完全避免了复制和粘贴，正如已经说过的，这是不好的。

对于这种情况，我能设想的唯一选择是一个参数和期望值的六元素数组。

一点儿没错!

Answer 3

关于HermanD的答案，因为这是Ruby!，所以您也可以在类中直接这样做，以创建唯一的测试方法：

class MyObjectTest < Test::Unit::TestCase
  [
   {:param => 1, :expected => 'whatever is expected'},
   {:param => 2, :expected => 'whatever is expected'},
   {:param => 3, :expected => 'whatever is expected'},
   {:param => 4, :expected => 'whatever is expected'},
   {:param => 5, :expected => 'whatever is expected'},
   {:param => 6, :expected => 'whatever is expected'}
  ].each do |test_case|
    define_method :"test_using_#{test_case[:param]}_should_return_#{params[:expected].underscore}" do
      assert_equal test_case[:expected], MyObject.new.do_something_with(test_case[:param])
    end
  end
end

使用Rspec(或Shoulda's)语句更自然一些，就像语言一样：

describe MyObject do
   [
   {:param => 1, :expected => 'whatever is expected'},
   {:param => 2, :expected => 'whatever is expected'},
   {:param => 3, :expected => 'whatever is expected'},
   {:param => 4, :expected => 'whatever is expected'},
   {:param => 5, :expected => 'whatever is expected'},
   {:param => 6, :expected => 'whatever is expected'}
  ].each do |test_case|
    it "should return #{test_case[:expected]} when using #{test_case[:param]}" do
      MyObject.new.do_something_with(test_case[:param]).should == test_case[:expected]
    end
  end
end