is-eq-four/test.js

Returns true if the given number is 4, false otherwise.

"use strict";

require("mocha");
const assert = require("assert");
const is4 = require("./");

describe("is4", function() {
    it("should return true if the number is 4", function() {
        assert(is4(4));
    });
  
    it("should return false if the number is not 4", function() {
        assert(!is4(4 + 1));
    });
    
    it("should return false if the number is not a number at all", function() {
        assert(!is4(null));
        assert(!is4(undefined));
        assert(!is4("4"));
        assert(!is4({prop: "4"}));
    });
});