stable-fn
Ensure a function is stable, meaning the same input always produces the same output
Useful for stress testing functions in your unit tests to make sure their behaviors are consistent.
Install
$ npm install stable-fn
Usage
import stableFunction from 'stable-fn';
stableFunction(() => true);
//=> true
let index = 0;
stableFunction.returnValue(100, () => {
if (++index === 10) {
return 'bar';
}
return 'foo';
});
//=> 'bar'API
stableFunction(count?, testFunction)
Returns a boolean whether the output of testFunction was stable.
stableFunction.returnValue(count?, testFunction)
Returns the first differing output of testFunction or the first output if stable.
count
Type: number
Default: 1000
Number of times to call the testFunction.
testFunction
Type: function
Function to be tested.