https://github.com/ndp/assert_changes

test helpers to concisely assert pre-conditions and post-conditions
https://github.com/ndp/assert_changes

Last synced: 4 months ago
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test helpers to concisely assert pre-conditions and post-conditions

• Host: GitHub
• URL: https://github.com/ndp/assert_changes
• Owner: ndp
• Created: 2009-05-14T04:16:19.000Z (about 17 years ago)
• Default Branch: master
• Last Pushed: 2009-05-14T08:29:39.000Z (about 17 years ago)
• Last Synced: 2025-10-08T03:55:28.263Z (8 months ago)
• Homepage:
• Size: 82 KB
• Stars: 2
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README

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README

          
Assertion that a specific state changes during invocation of the

passed in block.

  i = 'simple'

  assert_changes 'i' => 'whacky' do

     i = 'whacky'

  end

This can be read "assert i changes to wacky".

Function will verify both the precondition (i is NOT wacky),

and the post-condition.

This means i becomes nil during the block (and therefore non-nil

 beforehand):

  assert_changes 'i' => nil do ...

If you want to specify a specific transition, you can do so

by providing an array:

  assert_changes 'i' => ['simple','whacky'] do

To specify that there should be no changes, use the symbol :no_change.

  assert_changes 'i' => :no_change do

Finally, multiple assertions can be passed for larger sets

of state changes:

  i, j = 1,2

  assert_changes 'i' => [1, 2], 'j' => [2, 1] do

     Mixer.mix(i,j)

  end