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Allow messages to be functions #268

merged 1 commit into from Sep 29, 2014


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charlierudolph commented Jun 8, 2014

Useful for sinon-chai where the messages passed into assertions messages enumerate calls / arguments to the spy and shouldn't have to unless the assertion actually fails.
See domenic/sinon-chai#30 and domenic/sinon-chai#38


logicalparadox added a commit that referenced this pull request Sep 29, 2014

Merge pull request #268 from charlierudolph/cr-lazyMessages
Allow messages to be functions

@logicalparadox logicalparadox merged commit 834fd5b into chaijs:master Sep 29, 2014

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@charlierudolph charlierudolph deleted the charlierudolph:cr-lazyMessages branch Sep 29, 2014

domenic added a commit to domenic/sinon-chai that referenced this pull request Oct 5, 2014

Use Chai's new lazy-message feature.
Assertion messages are now functions instead of strings, which due to chaijs/chai#268 means they are lazily computed. This means we no longer trigger getters, e.g. the ones causing deprecation messages in #38. It also means that the actual process of calculating the assertion messages (including formatting the objects involved) only happens when the assertion fails, which fixes the slowness observed in #30.

So: fixes #30; fixes #38.
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