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+# Test Drive Development
+
+```
+npm install jasmine -g
+```
+
+multBy2.js:
+```javascript
+module.exports = (value) => {
+    return value * 2;
+}
+```
+
+test.js:
+```javascript
+const multBy2 = require('./module.js');
+
+describe("multBy2 test suite", function(){
+    it("should multiply a value by 2", function(){
+        expect(multBy2(2)).toBe(4)
+    })
+    it("should return 0 when passed 0", function(){
+        expect(multBy2(0)).toBe(1)
+    })
+})
+```
+
+```
+jasmine test.js 
+```