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using chai-as-promised caused error when run with grunt-mocha #95

rweng opened this Issue Nov 22, 2013 · 4 comments


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rweng commented Nov 22, 2013


I just added chai-as-promised to a project of mine. The tests run fine in real browsers, but not with phantom js. I get

TypeError: 'undefined' is not a function (evaluating 'promise.then.bind(promise)')
      at file:///Users/robin/Code/project/node_modules/chai-as-promised/lib/chai-as-promised.js:25
      at doAsserterAsyncAndAddThen (file:///Users/robin/Code/project/node_modules/chai-as-promised/lib/chai-as-promised.js:310)
      at file:///Users/robin/Code/lproject/node_modules/chai-as-promised/lib/chai-as-promised.js:283
      at file:///Users/robin/Code/project/node_modules/chai/chai.js:4462

Any spontaneous ideas why that could be?


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kmiyashiro commented Nov 22, 2013

No idea, I'm not familiar with chai-as-promised. I'm guessing promise is undefined? But the way it gets passed the promise is probably the root of the problem. I'd have to know more about your setup to investigate further, but you can try setting log to true and doing some console.logs to see what's going on.


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rweng commented Nov 25, 2013

Turns out, Function.prototype.bind is undefined. See ariya/phantomjs#10522.

Adding the polyfill at the beginning of my runner.html worked for me.


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kmiyashiro commented Nov 25, 2013

Closing out as it's a phantom issue

@kmiyashiro kmiyashiro closed this Nov 25, 2013


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meshfields commented Apr 8, 2015

You might find this interesting, it provides the polyfill:

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