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

Question

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

Bushed

Answer 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. 

Hyonhyoscine

Answer 2

How about this simple thing,

assert x>y

Kilohertz

Assert() can almost always be used to apply a given test, but it should be a last resort, because it gives much less meaningful results in the event of failure. In this case, a better approach is to use assert_operator. – Hyonhyoscine

I am getting an undefined method `assert_true'. Is it deprecated? – Bushed

The actual assertion to use with a boolean is just assert, not assert_true. – Hyonhyoscine

Answer 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

Masuria