Test::Unit Rails - How to assert one number is greater than another one?

问题

I am writing my first unit tests with Test::Unit and I have reached a point where I need to compare two numbers. Much to my surprise, I have discovered that none of the following were available:

assert_greater_than
assert_lesser_than
assert_greater_or_equal_than
assert_lesser_or_equal_than

Is this normal? How should I do it then?

Thanks

回答1:

Rather than provide a bunch of different assertions as you suggest, Test::Unit provides the method assert_operator, used like this:

assert_operator x, :>, y
assert_operator x, :>=, y
etc. 

回答2:

How about this simple thing,

assert x>y

回答3:

Here are some functions you can put in test/test_helper.rb

  def assert_gt(a, b)
    assert_operator a, :>, b
  end

  def assert_gte(a, b)
    assert_operator a, :>=, b
  end

  def assert_lt(a, b)
    assert_operator a, :<, b
  end

  def assert_lte(a, b)
    assert_operator a, :<=, b
  end

Then call like so:

assert_gt 6, 3
assert_gte 5, 5
assert_lt 4, 5
assert_lte 5, 5

来源：https://stackoverflow.com/questions/5819760/testunit-rails-how-to-assert-one-number-is-greater-than-another-one