composable object testing
npm install ruler
Ruler is meant for just simple, top-down testing; there is not need or desire to have a nested trees of "child" conditions, etc. You can build your tests via progamatically, or an array of objects with
value properties. The later of the two is ugly, but might be handy if you need to store the "rules" in a database or something.
Build assertions programatically:
var ruler = require'ruler'assert = require'assert';// initializevar engine = rulerrule'name.first'eq'john'rule'name.last'neq'buzz'rule'company'contains'red'rule'number'gte0lte100end;// rests an object against the "rule set"var result = enginetestname:first: 'john'last: 'doe'number: 50company: 'redventures';assertequalresult true;
Pass in an arrray of key/value rules:
var ruler = require'ruler'assert = require'assert';var obj =name:first: 'john'last: 'doe'number: 100company: 'redventures';var filters =comparator: 'is' path: 'name.first' value: 'john'comparator: 'not' path: 'name.last' value: 'buzz'comparator: 'contains' path: 'company' value: 'red'comparator: 'gte' path: 'number' value: 75;var engine = rulerfilters;var result = enginetestobj;assertequalresult true;
Rules sets can be created seperately for their own use, but then composed together in order to create more complex rules without having to create duplicated rules.
var ruler = require'ruler'assert = require'assert';// name rulesvar names = ruler;rule'name.first'eq'john'rule'name.last'neq'buzz';end;// info rulesvar info = rulerrule'company'contains'red'rule'number'gte50;// compose "name" and "info" togethervar all = namesandinfo;// test object against the "rule set"var result = alltestname:first: 'john'last: 'doe'number: 75company: 'redventures';assertequalresult true;
every()is probably slow.
Copyright 2012 Red Ventures
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