Chai matchers for increasing/decreasing sequences
npm install chai-increasingChai matchers for increasing/decreasing sequences
A chai plugin for forming assertions on increasing/decreasing sequences.
Monotonic increasing/decreasing:
``javascript`
expect([1,2,2,3,3,4]).to.be.increasing;
expect([5,4,4,4,4,3]).to.be.decreasing;
expect([1,1,1,1,1,1]).to.be.increasing;
expect([1,1,1,1,1,1]).to.be.decreasing;
Strictly increasing/decreasing:
`javascript`
expect([1,2,3,4,5]).to.be.strictly.increasing;
expect([1,2,3,3,4,5]).not.to.be.strictly.increasing;
expect([10,9,8,7,6]).to.be.strictly.increasing;
expect([10,9,8,7,7]).not.to.be.strictly.decreasing;
Empty arrays are vacuously increasing/decreasing:
`javascript`
expect([]).to.be.increasing;
expect([]).to.be.decreasing;
expect([]).to.be.strictly.increasing;
expect([]).to.be.strictly.decreasing;
Extras:
`javascript`
// supports Strings, Floats and Immutable.js Lists
expect(['Apple','Banana','Coconut']).to.be.strictly.increasing;
expect([1.15, 1.75, 3.28, 4.96]).to.be.strictly.increasing;
expect(Immutable.List.of([1,2,3,4])).to.be.strictly.increasing;
Nondecreasing/Nonincreasing aliases:
`javascript`
// "nondecreasing" and "nonincreasing" may be used instead
// of "increasing" and "decreasing" for clarity; the behaviour is the same.
expect([1,1,1]).to.be.increasing;
expect([1,1,1]).to.be.nondecreasing;
`bash`
npm install chai-increasing --save-dev
`javascript``
var chai = require('chai');
chai.use(require('chai-increasing'));
MIT License.
Copyright © 2016 James Lawson