lodash/test/overEvery.spec.js

import { stubTrue, stubOne, stubA, stubFalse, slice } from './utils';
import overEvery from '../src/overEvery';

describe('overEvery', () => {
    it('should create a function that returns `true` if all predicates return truthy', () => {
        const over = overEvery(stubTrue, stubOne, stubA);
        expect(over()).toBe(true);
    });

    it('should return `false` as soon as a predicate returns falsey', () => {
        let count = 0;
        const countFalse = function () {
            count++;
            return false;
        };
        const countTrue = function () {
            count++;
            return true;
        };
        const over = overEvery(countTrue, countFalse, countTrue);

        expect(over()).toBe(false);
        expect(count).toBe(2);
    });

    it('should use `_.identity` when a predicate is nullish', () => {
        const over = overEvery(undefined, null);

        expect(over(true)).toBe(true);
        expect(over(false)).toBe(false);
    });

    it('should work with `_.property` shorthands', () => {
        const over = overEvery('b', 'a');

        expect(over({ a: 1, b: 1 })).toBe(true);
        expect(over({ a: 0, b: 1 })).toBe(false);
    });

    it('should work with `_.matches` shorthands', () => {
        const over = overEvery({ b: 2 }, { a: 1 });

        expect(over({ a: 1, b: 2 })).toBe(true);
        expect(over({ a: 0, b: 2 })).toBe(false);
    });

    it('should work with `_.matchesProperty` shorthands', () => {
        const over = overEvery([
            ['b', 2],
            ['a', 1],
        ]);

        expect(over({ a: 1, b: 2 })).toBe(true);
        expect(over({ a: 0, b: 2 })).toBe(false);
    });

    it('should differentiate between `_.property` and `_.matchesProperty` shorthands', () => {
        let over = overEvery(['a', 1]);

        expect(over({ a: 1, 1: 1 })).toBe(true);
        expect(over({ a: 1, 1: 0 })).toBe(false);
        expect(over({ a: 0, 1: 1 })).toBe(false);

        over = overEvery([['a', 1]]);

        expect(over({ a: 1 })).toBe(true);
        expect(over({ a: 2 })).toBe(false);
    });

    it('should flatten `predicates`', () => {
        const over = overEvery(stubTrue, [stubFalse]);
        expect(over()).toBe(false);
    });

    it('should provide arguments to predicates', () => {
        let args;

        const over = overEvery(function () {
            args = slice.call(arguments);
        });

        over('a', 'b', 'c');
        expect(args).toEqual(['a', 'b', 'c']);
    });

    it('should use `this` binding of function for `predicates`', () => {
        const over = overEvery(
            function () {
                return this.b;
            },
            function () {
                return this.a;
            },
        );
        const object = { over: over, a: 1, b: 2 };

        expect(object.over()).toBe(true);

        object.a = 0;
        expect(object.over()).toBe(false);
    });
});