diff --git a/chapter01/1.1 - Is Unique/index.js b/chapter01/1.1 - Is Unique/index.js
new file mode 100644
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+++ b/chapter01/1.1 - Is Unique/index.js	
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+const { test, assert } = require('../../test/TestHelper');
+
+// Write your code here...
+function isUnique(str) {}
+
+/* TESTS */
+test('All unique characters should be true', () => {
+  const result = isUnique('abcd');
+  const expected = true;
+  assert(result).toBe(expected);
+});
+
+test('Duplicate character should be false', () => {
+  const result = isUnique('abccd');
+  const expected = false;
+  assert(result).toBe(expected);
+});
+
+test('Multiple duplicate characters should be false', () => {
+  const result = isUnique('bhjjb');
+  const expected = false;
+  assert(result).toBe(expected);
+});
+
+test('All unique characters should be true', () => {
+  const result = isUnique('mdjq');
+  const expected = true;
+  assert(result).toBe(expected);
+});
+
+test('When first and last character are the same, should be false', () => {
+  const result = isUnique('bob');
+  const expected = true;
+  assert(result).toBe(expected);
+});
+
+test('Single character should be true', () => {
+  const result = isUnique('a');
+  const expected = true;
+  assert(result).toBe(expected);
+});
diff --git a/test/TestHelper.js b/test/TestHelper.js
new file mode 100644
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--- /dev/null
+++ b/test/TestHelper.js
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+// @params: { String: title, Function: callback }
+function test(title, callback) {
+  try {
+    callback();
+    console.log(`✅ ${title}`);
+  } catch (error) {
+    console.log(`❌ ${title}`);
+    console.log('Error', error);
+  }
+}
+
+function assert(result) {
+  return {
+    toBe: function (expected) {
+      if (result !== expected) {
+        throw new Error(`Expected ${expected}. Received ${result}`);
+      }
+    },
+  };
+}
+
+module.exports = { test, assert };
+
+// NOTE: The only assertion right now is:
+// * toBe
+
+// HOW TO USE:
+// 1. Define your assertions.
+/* 
+  const result = add(10, 1);
+  const expected = 11;
+*/
+
+// 2. Call the test function:
+/* 
+test('Should be able to add two positive integers', function addTwoPositiveInt() {
+  const result = add(10, 1);
+  const expected = 11;
+  assert(result).toBe(expected);
+});
+*/