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59 lines
2.3 KiB
Markdown
59 lines
2.3 KiB
Markdown
#VCR.py
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This is a proof-of-concept start at a Python version of [Ruby's VCR
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library](https://github.com/myronmarston/vcr).
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[](http://travis-ci.org/kevin1024/vcrpy)
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##What it is supposed to do
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Simplify testing by recording all HTTP interactions and saving them to
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"cassette" files, which are just yaml files. Then when you run your tests
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again, they all just hit the text files instead of the internet. This speeds up
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your tests and lets you work offline.
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##Compatibility Notes
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This should work with Python 2.6 and 2.7. There aren't any context managers in
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2.5 so I'm not bothering with that.
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Currently I've only tested this (a little bit) with urllib2. It's known to *NOT
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WORK* with urllib.
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##How to use it
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```python
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import vcr
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import urllib2
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with vcr.use_cassette('fixtures/vcr_cassettes/synopsis.yaml'):
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response = urllib2.urlopen('http://www.iana.org/domains/example/').read()
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assert 'Example Domains' in response
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```
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Run this test once, and VCR.py will record the http request to
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`fixtures/vcr_cassettes/synopsis.yml`. Run it again, and VCR.py will replay the
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response from iana.org when the http request is made. This test is now fast (no
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real HTTP requests are made anymore), deterministic (the test will continue to
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pass, even if you are offline, or iana.org goes down for maintenance) and
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accurate (the response will contain the same headers and body you get from a
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real request).
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##Ruby VCR compatibility
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I'm not trying to match the format of the YAML files. Cassettes generated by
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Ruby's VCR are not compatible with VCR.py. The API is similar but VCR.py
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doesn't have nearly as many features.
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##Known Issues
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* Probably only works with urllib2.
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* [requests](http://docs.python-requests.org/en/latest/index.html) kinda works as long as you just do HTTP GETS and don't get too fancy.
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* Loading a HTTPS url and then a HTTP url in the same cassette will cause the second load to use the data from the HTTPS version of the URL: Issue #3
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* Loading urls that do a 301/302 redirect don't work: Issue #4
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* I haven't tested PUT/DELETE requests
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##Similar libraries in Python
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Neither of these really implement the API I want, but I have cribbed some code
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from them.
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* https://github.com/bbangert/Dalton
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* https://github.com/storborg/replaylib
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#License
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This library uses the MIT license
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