test: add test for get-unique-words

Author: ChristieRobson

src/_DataStructures_/Trees/Trie/get-unique-words/get-unique-words.test.js

@@ -0,0 +1,16 @@
+const getUniqueWords = require('./index');
+const Trie = require('../index');
+
+describe('Data Structure : Trie : Get unique words', () => {
+  it('Should returns unique words (no duplicates), sorted alphabetically', () => {
+    const words = ['bed', 'ball', 'apple', 'java', 'javascript', 'bed'];
+    const trie = new Trie();
+
+    words.forEach(word => trie.insert(word));
+
+    const result = getUniqueWords(trie.root);
+
+    const expected = ['apple', 'ball', 'bed', 'java', 'javascript'];
+    expect(expected).toEqual(result);
+  });
+});