- What Is It?
- Status
- Installation
- Sample Test
- Examples
- Installation
- How Do I Use It?
- Other Goodies
- Basic Test Set Syntax
- Benchmarking?
- RPM-based installation
- Project Policies
- FAQ
- Feedback and Contributions
- A REST testing and API microbenchmarking tool
- Tests are defined in basic YAML or JSON config files, no code needed
- Minimal dependencies (pycurl, pyyaml), making it easy to deploy on-server for smoketests/healthchecks
- Supports generate/extract/validate mechanisms to create full test scenarios
- Returns exit codes on failure, to slot into automated configuration management/orchestration tools (also supplies parseable logs)
- Logic is written and extensible in Python
Apache License, Version 2.0
Changelog shows the past and present, milestones show the future roadmap.
- The changelog will also show features/fixes currently merged to the master branch but not released to PyPi yet (pending installation tests across platforms).
PyRestTest works on Linux or Mac with Python 2.6, 2.7, or 3.3+ (alpha status, not released for pip install yet).
First we need to install package python-pycurl:
- Ubuntu/Debian: (sudo)
apt-get install python-pycurl - CentOS/RHEL: (sudo)
yum install python-pycurl - Mac: don't worry about it
- Other platforms: unsupported. You may get it to work by installing pycurl & pyyaml manually. No guarantees though. This is needed because the pycurl dependency may fail to install by pip. In very rare cases you may need to intall python-pyyaml if pip cannot install it correctly.
It is easy to install the latest release by pip:
(sudo) pip install pyresttest
If pip isn't installed, we'll want to install it first: If that is not installed, we'll need to install it first:
- Ubuntu/Debian: (sudo)
apt-get install python-pip - CentOS/RHEL: (sudo)
yum install python-pip - Mac OS X with homebrew:
brew install python(it's included) - Or with just python installed:
wget https://bootstrap.pypa.io/get-pip.py && sudo python get-pip.py
Releases occur every few months, if you want to use unreleased features, it's easy to install from source:
See the Change Log for feature status.
git clone https://github.com/svanoort/pyresttest.git
cd pyresttest
sudo python setup.py installThe master branch tracks the latest; it is unit tested, but less stable than the releases (the 'stable' branch tracks tested releases).
Almost all installation issues are due to problems with PyCurl and PyCurl's native libcurl bindings. It is easy to check if PyCurl is installed correctly:
python -c 'import pycurl'
If this returns correctly, pycurl is installed, if you see an ImportError or similar, it isn't. You may also verify the pyyaml installation as well, since that can fail to install by pip in rare circumstances.
__main__.ConfigurationError: Could not run curl-config: [Errno 2] No such file or directory
This is caused by libcurl not being installed or recognized: first install pycurl using native packages as above. Alternately, try installing just the libcurl libraries:
- On Ubuntu/Debian:
sudo apt-get install libcurl4-openssl-dev - On CentOS/RHEL:
yum install libcurl-devel
PyCurl should install by pip, but sometimes has issues with pycurl/libcurl. Manually copying in a working system pycurl installation may help:
cp /usr/lib/python2.7/dist-packages/pycurl* env/local/lib/python2.7/site-packages/
This will check that APIs accept operations, and will smoketest an application
---
- config:
- testset: "Basic tests"
- test:
- name: "Basic get"
- url: "/api/person/"
- test:
- name: "Get single person"
- url: "/api/person/1/"
- test:
- name: "Delete a single person, verify that works"
- url: "/api/person/1/"
- method: 'DELETE'
- test: # create entity by PUT
- name: "Create/update person"
- url: "/api/person/1/"
- method: "PUT"
- body: '{"first_name": "Gaius","id": 1,"last_name": "Baltar","login": "gbaltar"}'
- headers: {'Content-Type': 'application/json'}
- validators: # This is how we do more complex testing!
- compare: {header: content-type, comparator: contains, expected:'json'}
- compare: {jsonpath_mini: 'login', expected: 'gbaltar'} # JSON extraction
- compare: {raw_body:"", comparator:contains, expected: 'Baltar' } # Tests on raw response
- test: # create entity by POST
- name: "Create person"
- url: "/api/person/"
- method: "POST"
- body: '{"first_name": "William","last_name": "Adama","login": "theadmiral"}'
- headers: {Content-Type: application/json}- The Quickstart should be everyone's starting point
- Here's a really good example for how to create a user and then do tests on it.
- This shows how to use extraction from responses, templating, and different test types
- If you're trying to do something fancy, take a look at the content-test.yaml.
- This shows most kinds of templating & variable uses. It shows how to read from file, using a variable in the file path, and templating on its content!
- PyRestTest isn't limited to JSON; there's an example for submitting form data
- There's a whole folder of example tests to help get started
- The Quickstart walks through common use cases
- Benchmarking has its own section below
- Advanced features have separate documentation (templating, generators, content extraction, complex validation).
- How to extend PyRestTest is its own document
- There are a ton of examples
Run a basic test of the github API:
pyresttest https://api.github.com examples/github_api_smoketest.yamlA simple set of tests that show how json validation can be used to check contents of a response. Test includes both successful and unsuccessful validation using github API.
pyresttest https://api.github.com examples/github_api_test.yaml(For help: pyresttest --help )
Same as the other test but running in interactive mode.
pyresttest https://api.github.com examples/github_api_test.yaml --interactive true --print-bodies truepyresttest https://api.github.com examples/github_api_test.yaml --log debug- Simple templating of HTTP request bodies, URLs, and validators, with user variables
- Generators to create dummy data for testing, with support for easily writing your own
- Sequential tests: extract info from one test to use in the next
- Import test sets in other test sets, to compose suites of tests easily
- Easy benchmarking: convert any test to a benchmark, by changing the element type and setting output options if needed
- Lightweight benchmarking: ~0.3 ms of overhead per request, and plans to reduce that in the future
- Accurate benchmarking: network measurements come from native code in LibCurl, so test overhead doesn't alter them
- Optional interactive mode for debugging and demos
As you can see, tests are defined in YAML format.
There are 5 top level test syntax elements:
- url: a simple test, fetches given url via GET request and checks for good response code
- test: a fully defined test (see below)
- benchmark: a fully defined benchmark (see below)
- config or configuration: overall test configuration
- import: import another test set file so you Don't Repeat Yourself
---
# Will load the test sets from miniapp-test.yaml and run them
- import: examples/miniapp-test.yamlA simple URL test is equivalent to a basic GET test with that URL
---
- config:
- testset: "Basic tests"
- url: "/api/person/" # This is a simple test
- test:
- url: "/api/person/" # This does the same thingFor advanced cases (example: SSL client certs), sometimes you will want to use custom Curl settings that don't have a corresponding option in PyRestTest.
This is easy to do: for each test, you can specify custom Curl arguments with 'curl_option_optionname.' For this, 'optionname' is case-insensitive and the optionname is a Curl Easy Option with 'CURLOPT_' removed.
For example, to follow redirects up to 5 times (CURLOPT_FOLLOWLOCATION and CURLOPT_MAXREDIRS):
---
- test:
- url: "/api/person/1"
- curl_option_followlocation: True
- curl_option_maxredirs: 5 Note that while option names are validated, no validation is done on their values.
Whenever possible, I've tried to make reading configuration Be Smart And Do The Right Thing. That means type conversions are handled wherever possible, and fail early if configuration is nonsensical.
We're all responsible adults: don't try to give a boolean or list where an integer is expected and it'll play nice.
One caveat: if you define the same element (example, URL) twice in the same enclosing element, the last value will be used. In order to preserve sanity, I use last-value wins.
Oh, yes please! PyRestTest allows you to collect low-level network performance metrics from Curl itself.
Benchmarks are based off of tests: they extend the configuration elements in a test, allowing you to configure the REST call similarly. However, they do not perform validation on the HTTP response, instead they collect metrics.
There are a few custom configuration options specific to benchmarks:
- warmup_runs: (default 10 if unspecified) run the benchmark calls this many times before starting to collect data, to allow for JVM warmup, caching, etc
- benchmark_runs: (default 100 if unspecified) run the benchmark this many times to collect data
- output_file: (default is None) file name to write benchmark output to, will get overwritten with each run, if none given, will write to terminal only
- output_format: (default CSV if unspecified) format to write the results in ('json' or 'csv'). More on this below.
- metrics: which metrics to gather (explained below), MUST be specified or benchmark will do nothing
There are two ways to collect performance metrics: raw data, and aggregated stats. Each metric may yield raw data, plus one or more aggregate values.
- Raw Data: returns an array of values, one for each benchmark run
- Aggregates: runs a reduction function to return a single value over the entire benchmark run (median, average, etc)
To return raw data, in the 'metrics' configuration element, simply input the metric name in a list of values. The example below will return raw data for total time and size of download (101 values each).
- benchmark: # create entity
- name: "Basic get"
- url: "/api/person/"
- warmup_runs: 7
- 'benchmark_runs': '101'
- output_file: 'miniapp-benchmark.csv'
- metrics:
- total_time
- size_download
Aggregates are pretty straightforward:
- mean or mean_arithmetic: arithmetic mean of data (normal 'average')
- mean_harmonic: harmonic mean of data (useful for rates)
- median: median, the value in the middle of sorted result set
- std_deviation: standard deviation of values, useful for measuring how consistent they are
- total or sum: total up the values given
Currently supported metrics are listed below, and these are a subset of Curl get_info variables. These variables are explained here (with the CURLINFO_ prefix removed): curl_easy_get_info documentation
Metrics: 'appconnect_time', 'connect_time', 'namelookup_time', 'num_connects', 'pretransfer_time', 'redirect_count', 'redirect_time', 'request_size', 'size_download', 'size_upload', 'speed_download', 'speed_upload', 'starttransfer_time', 'total_time'
CSV is the default report format. CSV ouput will include:
- Benchmark name
- Benchmark group
- Benchmark failure count (raw HTTP failures)
- Raw data arrays, as a table, with headers being the metric name, sorted alphabetically
- Aggregates: a table of results in the format of (metricname, aggregate_name, result)
In JSON, the data is structured slightly differently:
{"failures": 0,
"aggregates":
[["metric_name", "aggregate", "aggregateValue"] ...],
"failures": failureCount,
"group": "Default",
"results": {"total_time": [value1, value2, etc], "metric2":[value1, value2, etc], ... }
}
Samples:
---
- config:
- testset: "Benchmark tests using test app"
- benchmark: # create entity
- name: "Basic get"
- url: "/api/person/"
- warmup_runs: 7
- 'benchmark_runs': '101'
- output_file: 'miniapp-benchmark.csv'
- metrics:
- total_time
- total_time: mean
- total_time: median
- size_download
- speed_download: median
- benchmark: # create entity
- name: "Get single person"
- url: "/api/person/1/"
- metrics: {speed_upload: median, speed_download: median, redirect_time: mean}
- output_format: json
- output_file: 'miniapp-single.json'
It's easy to build and install from RPM:
python setup.py bdist_rpm # Build RPM
find -iname '*.rpm' # Gets the RPM namesudo yum localinstall my_rpm_name
sudo yum install PyYAML python-pycurl # If using python3, needs 'future' too- You need to install PyYAML & PyCurl manually because Python distutils can't translate python dependencies to RPM packages.
Gotcha: Python distutils add a dependency on your major python version. This means you can't build an RPM for a system with Python 2.6 on a Python 2.7 system.
You'll need to install rpm-build, and then it should work.
sudo yum install rpm-build- PyRestTest uses the Github flow
- The master branch is an integration branch for mature features
- Releases are cut periodically from master (every 3-6 months generally, or more often if breaking bugs are present) and released to PyPi
- Feature development is done in feature branches and merged to master by PR when tested (validated by continuous integration in Jenkins)
- The 'stable' branch tracks the last release, use this if you want to run PyRestTest from source
- The changelog is here, this will show past releases and features merged to master for the next release but not released
- Testing: tested on Ubuntu 14/python 2.7 and CentOS 6/python 6.6, plus Debian Wheezy for Python 3.4.3
- Releases occur every few months to PyPi once a few features are ready to go
- PyRestTest uses Semantic Versioning 2.0
- Back-compatibility is important! PyRestTest makes a strong effort to maintain command-line and YAML format back-compatibility since 1.0.
- Extension method signatures are maintained as much as possible.
- However, internal python implementations are subject to change.
- Major version releases (1.x to 2.x, etc) may introduce breaking API changes, but only with a really darned good reason, and only there's not another way.
We welcome any feedback you have, including pull requests, reported issues, etc!
For new contributors there are a whole set of issues labelled with help wanted which are excellent starting points to offer a contribution!
For instructions on how to set up a dev environment for PyRestTest, see building.md.
For pull requests to get easily merged, please:
- Include unit tests (and functional tests, as appropriate) and verify that run_tests.sh passes
- Include documentation as appropriate
- Attempt to adhere to PEP8 style guidelines and project style
Bear in mind that this is largely a one-man, outside-of-working-hours effort at the moment, so response times will vary. That said: every feature request gets heard, and even if it takes a while, all the reasonable features will get incorporated. If you fork the main repo, check back periodically... you may discover that the next release includes something to meet your needs and then some!
- This is written for an environment where Python is not the sole or primary language
- You totally can do pure-Python tests if you want!
- Extensions provide a stable API for adding more complex functionality in python
- All modules can be imported and used as libraries
- Gotcha: the project is still young, so internal implementation may change often, much more than YAML features
- XML is extremely verbose and has many gotchas for parsing
- You CAN use JSON for tests, it's a subset of YAML. See miniapp-test.json for an example.
- YAML tends to be the most concise, natural, and easy to write of these three options
- No, this is a separate niche and there are already many excellent tools to fill it
- Adding load testing features would greatly increase complexity
- But some form might come eventually!
- PyRestTest needs the low-level networking features that PyCurl exposes, benchmarking is 100% dependent for this
- As a wrapper for LibCurl, PyCurl tends to offer a mature and featureful system