curry-spec.js

describe('curry function', function () {
    var fn1, fn2, curried1, curried2

    beforeEach(function () {
        fn1 = function (a, b, c) {
            return a + b + c;
        }
        fn2 = function (a, b) {
            return a * b;
        }
        curried1 = Monet.curry(fn1)
        curried2 = Monet.curry(fn2)
    })

    afterEach(function () {
        fn = curried = undefined
    })

    it('should return function that works as original without curring', function () {
        expect(curried1(1, 1, 1)).toBe(fn1(1, 1, 1))
        expect(curried2(2, 2)).toBe(fn2(2, 2))
    })

    it('should return properly curried function', function () {
        expect(curried1(1)(1, 1)).toBe(fn1(1, 1, 1))
        expect(curried1(1)(2, 3)).toBe(fn1(1, 2, 3))
        expect(curried1(1, 2)(1)).toBe(fn1(1, 2, 1))
        expect(curried1(2)(1)(2)).toBe(fn1(2, 1, 2))
        expect(curried2(2)(3)).toBe(fn2(2, 3))
    })

    it('should provide curried function with not higher arity', function () {
        expect(curried1(1, 1, 1, 5, 22)).toBe(fn1(1, 1, 1))
        expect(curried1(1)(1, 1, 3)).toBe(fn1(1, 1, 1))
        expect(curried1(1)(2, 3, 5)).toBe(fn1(1, 2, 3))
        expect(curried1(1, 2)(1, 1)).toBe(fn1(1, 2, 1))
        expect(curried1(2)(1)(2, 3, 5, 7, 8)).toBe(fn1(2, 1, 2))
        expect(curried2(2)(3, 22)).toBe(fn2(2, 3))
        expect(curried2(2, 2, 3, 4)).toBe(fn2(2, 2))
    })
})