Add a templates folder with a template for a simple tdd experiment

Author: js-jslog

templates/tdd/index.js

@@ -0,0 +1,3 @@
+const index = function index() {};
+
+module.exports = { index };

templates/tdd/index.test.js

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+const index = require('./index');
+
+test('index contains an index function', () => {
+  expect(index.index).toBeDefined();
+});