test.js

var expect = require('chai').expect;
var commandScore = require ('./index.js');

/*global describe,it*/
describe("commandScore", function () {

    it("should match exact strings exactly", function () {
        expect(commandScore("hello", "hello")).to.equal(1);
    });

    it("should prefer case-sensitive matches", function () {
        expect(commandScore("Hello", "Hello")).to.be.greaterThan(commandScore("Hello", "hello"));
    });

    it("should mark down prefixes", function () {
        expect(commandScore("hello", "hello")).to.be.greaterThan(commandScore("hello", "he"));
    });

    it("should score all prefixes the same", function () {
        expect(commandScore("help", "he")).to.equal(commandScore("hello", "he"));
    });

    it("should mark down word jumps", function () {
        expect(commandScore("hello world", "hello")).to.be.greaterThan(commandScore("hello world", "hewo"));
    });

    it("should score similar word jumps the same", function () {
        expect(commandScore("hello world", "hewo")).to.equal(commandScore("hey world", "hewo"));
    });

    it("should penalize long word jumps", function () {
        expect(commandScore("hello world", "hewo")).to.be.greaterThan(commandScore("hello kind world", "hewo"));
    });

    it("should match missing characters", function () {
        expect(commandScore("hello", "hl")).to.be.greaterThan(0);
    });

    it("should penalize more for more missing characters", function () {
        expect(commandScore("hello", "hllo")).to.be.greaterThan(commandScore("hello", "hlo"));
    });

    it("should penalize more for missing characters than case", function () {
        expect(commandScore("go to Inbox", "in")).to.be.greaterThan(commandScore("go to Unversity/Societies/CUE/info@cue.org.uk", "in"));
    });

    it("should match transpotisions", function () {
        expect(commandScore("hello", "hle")).to.be.greaterThan(0);
    });

    it('should not match with a trailing letter', function () {
        expect(commandScore("ss", "sss")).to.equal(0.1)
    });

    it('should match long jumps', function () {
        expect(commandScore("go to @QuickFix", "fix")).to.be.greaterThan(0)
        expect(commandScore("go to Quick Fix", "fix")).to.be.greaterThan(commandScore("go to @QuickFix", "fix"))
    });

    it('should work well with the presence of an m-dash', function () {
        expect(commandScore("no go — Windows", "windows")).to.be.greaterThan(0)
    });

    it('should be robust to duplicated letters', function () {
        expect(commandScore("talent", "tall")).to.be.equal(0.099)
    });

    it('should not allow letter insertion', function () {
        expect(commandScore("talent", "tadlent")).to.be.equal(0)
    });

    it('should match - with " " characters', function () {
        expect(commandScore('Auto-Advance', 'Auto Advance')).to.be.equal(0.9999)
    });

    it('should score long strings quickly', function () {
        expect(commandScore("go to this is a really long label that is really longthis is a really long label that is really longthis is a really long label that is really longthis is a really long label that is really long", "this is a")).to.be.equal(0.891)
    });
});