Chai doesn't play nice with JS Lint's check for incorrect use of `false` and `true` -- a setting that cannot be turned off via JS Lint options. The addition of `_true` and `_false` properties to Chai fixes this making JS Lint work correctly.

mocha_jslint_happy.js

    // We're providing some convenience functions here as well as making sure
    // chai tests don't fall on jshint errors by remapping true/false properties
    chai.Assertion.addProperty('_true', function () {
        this.assert(
            true === this.__flags.object,
            'expected #{this} to be true',
            'expected #{this} to be false',
            this.negate ? false : true
        );
    });
    chai.Assertion.addProperty('_false', function () {
        this.assert(
            false === this.__flags.object,
            'expected #{this} to be false',
            'expected #{this} to be true',
            this.negate ? true : false
        );
    });