Some Jasmine Tests for idiomatic.js

JasmineTestsIdiomatic.js

/*
 * Writing Unit Tests to learn code or a library has been a fantastic strategy for me.
 * I wrote these Jasmine Tests to enforce some of the very powerful concepts from  
 * https://github.com/rwldrn/idiomatic.js?utm_source=javascriptweekly&utm_medium=email.
 */
describe("JavaScript Idiomatics", function() {

	describe("Coercion", function() {

		it("coerces string into number", function() {
			var one = "1";
			expect(one).toNotEqual(1);
			expect(+one).toEqual(1);
		});

		it("coerces number into string", function() {
			var one = 1;
			expect(one).toNotEqual("1");
			expect(one + "").toEqual("1");
		});

		it("coerces boolean into number", function() {
			var bool = false;
			expect(bool).toNotEqual(0);
			expect(+bool).toEqual(0);
		});

		it("coerces boolean into string", function() {
			var bool = false;
			expect(bool).toNotEqual("false");
			expect(bool + "").toEqual("false");
		});

		it("coerces undefined into string", function() {
			var undef;
			expect(undef).toNotEqual("undefined");
			expect(undef + "").toEqual("undefined");
		});
		
	});

	describe("Conditional Evaluations", function() {

		it("evaluates an empty array length as false", function() {
			var array = [];
			expect(array.length).toBeFalsy();
		});
		
		it("evaluates a non-empty array length as true",function(){
			var array = [1];
			expect(array.length).toBeTruthy();
		});
		
		it("evaluates an empty string length as false",function(){
			var string = "";
			expect(string.length).toBeFalsy();
		});
		
		it("evaluates a non-empty string length as true",function(){
			var string = "hi";
			expect(string.length).toBeTruthy();
		});
		
		it("evaluates object existence as true",function(){
			var string = "hi";
			expect(string).toBeTruthy();
		});
		
		it("uses !! as true",function(){
			var bool = true;
			expect(!!bool).toBeTruthy();
		});
	});
	
	describe("Type Checking",function(){
		
		it("checks types",function(){
			expect(typeof "hello" === "string").toBeTruthy();
			expect(typeof 1 === "number").toBeTruthy();
			expect(typeof false === "boolean").toBeTruthy();
			expect(typeof {} === "object").toBeTruthy();			
		});
		
		it("can both distinguish undefined/null and group them",function(){
			var variable;
			expect(variable === null).toBeFalsy();
			expect(variable == null).toBeTruthy();
			expect(variable === undefined).toBeTruthy();		//local
			expect(variable === "undefined").toBeFalsy();
		});		
	});
});