Implement Test Driven Development!!!!!

- thats right, just got it set up so I can write the tests _first_

- Even better, both the code and the tests are in typescript!

src/ContentLine.spec.ts

@@ -2,9 +2,11 @@ import ContentLine from "./ContentLine";
 import { expect } from "chai";
 import "mocha";
 
-describe("Hello", () => {
-    it("Should say hi", () => {
-        expect("hi").to.equal("hi");
-    });
-});
+describe("ContentLine", () => {
+    it("Should exist", () => {
+        let result = !ContentLine;
+
+        expect(result).to.be.false;
+    })
+})
 

src/greet.ts

-export function sayHello(name: string) {
-    return `Hello from ${name}`;
-}

src/main.ts

-import { sayHello } from "./greet";
-
-console.log(sayHello("TypeScript"));
-

src/util.spec.ts

+import { isAlpha } from "./util";
+import { expect } from "chai";
+import "mocha";
+
+describe("util", () => {
+    describe("isAlpha", () => {
+        it("Should return false for numbers", () => {
+            let test = "12345";
+            let result = isAlpha(test);
+
+            expect(result).to.be.false;
+        });
+
+        it("Should return false for alpha numerics", () => {
+            let test = "a2a";
+            let result = isAlpha(test);
+
+            expect(result).to.be.false;
+        });
+
+        it("Should return true for lowercase alpha", () => {
+            let test = "abcdef";
+            let result = isAlpha(test);
+
+            expect(result).to.be.true;
+        });
+
+        it("Should return true for uppercase alpha", () => {
+            let test = "ABCDEF";
+            let result = isAlpha(test);
+
+            expect(result).to.be.true
+        });
+
+        it("Should return true for mixed alpha", () => {
+            let test = "aBcDeF";
+            let result = isAlpha(test);
+
+            expect(result).to.be.true;
+        });
+    });
+});

src/util.ts

 export function isAlpha(input: string): boolean {
     return /^[a-zA-Z]+$/.test(input);
-}
\ No newline at end of file
+}