Automatically mock your HTTP interactions to simplify and speed up testing
Project description
VCR.py
This is a Python version of Ruby’s VCR library.
- Source code
- Documentation
Rationale
VCR.py simplifies and speeds up tests that make HTTP requests. The first time you run code that is inside a VCR.py context manager or decorated function, VCR.py records all HTTP interactions that take place through the libraries it supports and serializes and writes them to a flat file (in yaml format by default). This flat file is called a cassette. When the relevant piece of code is executed again, VCR.py will read the serialized requests and responses from the aforementioned cassette file, and intercept any HTTP requests that it recognizes from the original test run and return the responses that corresponded to those requests. This means that the requests will not actually result in HTTP traffic, which confers several benefits including:
The ability to work offline
Completely deterministic tests
Increased test execution speed
If the server you are testing against ever changes its API, all you need to do is delete your existing cassette files, and run your tests again. VCR.py will detect the absence of a cassette file and once again record all HTTP interactions, which will update them to correspond to the new API.
Support
VCR.py works great with the following HTTP clients:
requests
aiohttp
urllib3
tornado
urllib2
boto3
License
This library uses the MIT license. See LICENSE.txt for more details
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