import {Predicate, Context} from './predicate';

export class BooleanPredicate extends Predicate<boolean> {
	constructor(context?: Context) {
		super('boolean', context);
	}

	/**
	 * Test a boolean to be true.
	 */
	get true() {
		return this.addValidator({
			message: value => `Expected ${value} to be true`,
			validator: value => value === true
		});
	}

	/**
	 * Test a boolean to be false.
	 */
	get false() {
		return this.addValidator({
			message: value => `Expected ${value} to be false`,
			validator: value => value === false
		});
	}
}