tsoid/dist/src/utils/__tests__/compose.test.js

Typed functional library to deal with async operations.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
const compose_1 = require("../compose");
describe('compose', () => {
    const double = (x) => x * 2;
    const triple = (x) => x * 3;
    const isEven = (x) => x % 2 === 0;
    it('Composing three functions should return the right value', () => {
        const fn = compose_1.default(isEven, double, triple);
        expect(fn(3)).toBe(true);
    });
    it('Composing two functon should return the right value', () => {
        const fn = compose_1.default(isEven, triple);
        expect(fn(3)).toBe(false);
    });
    it('Should print right composition', () => {
        const fn1 = (arg) => `fn1(${arg})`;
        const fn2 = (arg) => `fn2(${arg})`;
        const fn3 = (arg) => `fn3(${arg})`;
        const fn4 = (arg) => `fn4(${arg})`;
        const composed = compose_1.default(fn1, fn2, fn3, fn4);
        expect(composed(1)).toBe('fn1(fn2(fn3(fn4(1))))');
    });
});