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

Jacob Mattison · Accepted Answer · 2011-04-28T14:06:01.080

81

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.

edited Apr 28 '11 at 14:06

answered Apr 28 '11 at 13:59

Jacob Mattison

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bragboy · Answer 2 · 2011-04-28T14:09:25.823

15

How about this simple thing,

assert x>y

edited Apr 28 '11 at 14:09

answered Apr 28 '11 at 13:56

bragboy

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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. – Jacob Mattison Apr 28 '11 at 14:01
I am getting an undefined method `assert_true'. Is it deprecated? – Amokrane Chentir Apr 28 '11 at 14:05
5

The actual assertion to use with a boolean is just `assert`, not `assert_true`. – Jacob Mattison Apr 28 '11 at 14:06

score 6 · Answer 3 · edited Aug 30 '22 at 12:51

6

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

edited Aug 30 '22 at 12:51

Deepak Mahakale

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answered Sep 28 '17 at 19:28

Tyler

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

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