diff --git a/DIRECTORY.md b/DIRECTORY.md
index 6c1fa7aeb8..7f6484cae5 100644
--- a/DIRECTORY.md
+++ b/DIRECTORY.md
@@ -35,6 +35,8 @@
   * [ROT13](Ciphers/ROT13.js)
   * [VigenereCipher](Ciphers/VigenereCipher.js)
   * [XORCipher](Ciphers/XORCipher.js)
+* **Compression**
+  * [RLE](Compression/RLE.js)
 * **Conversions**
   * [ArbitraryBase](Conversions/ArbitraryBase.js)
   * [ArrayBufferToBase64](Conversions/ArrayBufferToBase64.js)
@@ -285,6 +287,7 @@
   * [Problem016](Project-Euler/Problem016.js)
   * [Problem017](Project-Euler/Problem017.js)
   * [Problem018](Project-Euler/Problem018.js)
+  * [Problem019](Project-Euler/Problem019.js)
   * [Problem020](Project-Euler/Problem020.js)
   * [Problem021](Project-Euler/Problem021.js)
   * [Problem023](Project-Euler/Problem023.js)
diff --git a/Project-Euler/test/Problem014.test.js b/Project-Euler/test/Problem014.test.js
new file mode 100644
index 0000000000..ff464dd42d
--- /dev/null
+++ b/Project-Euler/test/Problem014.test.js
@@ -0,0 +1,15 @@
+import { expect } from 'vitest'
+import { findLongestCollatzSequence } from '../Problem014.js'
+
+describe('Longest Collatz Sequence', () => {
+  test.each([
+    [2, 1],
+    [13, 9],
+    [1000000, 837799]
+  ])(
+    'if limit is %i, then the Longest Collatz Sequence will be %i',
+    (a, expected) => {
+      expect(findLongestCollatzSequence(a)).toBe(expected)
+    }
+  )
+})