Generative property testing for Jasmine
jasmine-check adds the generative testing power of
to Jasmine. This allows some of your Jasmine tests
to accept arguments and ensure your tests pass not just under your contrived
test cases but also pass for hundreds of randomly generated test cases.
jasmine-check using npm.
npm install jasmine-check
Then include and install
jasmine-check before your test suite.
gen global object is provided directly by
testcheck-js and defines what
type of random values to generate. The test will be run numerous times with
different random values, ensuring all expectations are met for every run. If a
test expectation fails, then the test will re-run with "smaller" values until
the smallest failing value is found which can better help explain edge cases
with your test and produce consistent results, despite being initially fueled
If a test is taking a long time, needs to generate larger values, or should be
run with a consistent random seed, you can alter the behavior with
times: number; // the number of test cases to run. Default: 100maxSize: number; // the maximum "size" of the test data. Default: 200seed: number; // defaults to a random value from 1 to 2^32-1.
To use these options with your check, include an options object after the description:
To learn more about property testing, or to learn about the available value
generators, check out