From 0ea2f16918f72f4385df629fbc85590a896e0ec0 Mon Sep 17 00:00:00 2001
From: vbetsch <vic.betsch@gmail.com>
Date: Wed, 1 Jul 2026 00:03:15 +0200
Subject: [PATCH 1/3] test: add tests

---
 tests/cypher.test.ts | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/tests/cypher.test.ts b/tests/cypher.test.ts
index 0951aa1..fb69887 100644
--- a/tests/cypher.test.ts
+++ b/tests/cypher.test.ts
@@ -6,6 +6,14 @@ describe('Cypher', () => {
     expect(cypher).toBeDefined();
     expect(cypher).toBeInstanceOf(Cypher);
   });
+  it('should decrypt h', () => {
+    const cypher: Cypher = new Cypher();
+    expect(cypher.decrypt('&')).toBe('h');
+  });
+  it('should decrypt he', () => {
+    const cypher: Cypher = new Cypher();
+    expect(cypher.decrypt('&£')).toBe('he');
+  });
   it('should decrypt hello', () => {
     const cypher: Cypher = new Cypher();
     expect(cypher.decrypt('&£aad')).toBe('hello');
@@ -14,6 +22,14 @@ describe('Cypher', () => {
     const cypher: Cypher = new Cypher();
     expect(cypher.decrypt('ldga(')).toBe('world');
   });
+  it('should encrypt h', () => {
+    const cypher: Cypher = new Cypher();
+    expect(cypher.encrypt('h')).toBe('&');
+  });
+  it('should encrypt he', () => {
+    const cypher: Cypher = new Cypher();
+    expect(cypher.encrypt('he')).toBe('&£');
+  });
   it('should encrypt hello', () => {
     const cypher: Cypher = new Cypher();
     expect(cypher.encrypt('hello')).toBe('&£aad');

From 77d1395aafeeb8882036be035a420f1160a864e8 Mon Sep 17 00:00:00 2001
From: vbetsch <vic.betsch@gmail.com>
Date: Wed, 1 Jul 2026 00:09:04 +0200
Subject: [PATCH 2/3] feat: handle cases

---
 src/cypher.ts        | 2 +-
 tests/cypher.test.ts | 6 +++++-
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/cypher.ts b/src/cypher.ts
index eec8389..04c2388 100644
--- a/src/cypher.ts
+++ b/src/cypher.ts
@@ -71,6 +71,6 @@ export class Cypher {
   }
 
   public encrypt(message: string): string {
-    return this._translate(this._alphabet, this._decryptionKey, message);
+    return this._translate(this._alphabet, this._decryptionKey, message.toLowerCase());
   }
 }
diff --git a/tests/cypher.test.ts b/tests/cypher.test.ts
index fb69887..2e01819 100644
--- a/tests/cypher.test.ts
+++ b/tests/cypher.test.ts
@@ -1,4 +1,4 @@
-import { Cypher } from '@src/cypher';
+import {Cypher} from '@src/cypher';
 
 describe('Cypher', () => {
   it('should be OK', () => {
@@ -38,4 +38,8 @@ describe('Cypher', () => {
     const cypher: Cypher = new Cypher();
     expect(cypher.encrypt('world')).toBe('ldga(');
   });
+  it('should handle cases', () => {
+    const cypher: Cypher = new Cypher();
+    expect(cypher.encrypt('Hello')).toBe('&£aad');
+  });
 });

From 817efa6b5bf222ef86a5bc8f64c261bdd36f251a Mon Sep 17 00:00:00 2001
From: vbetsch <vic.betsch@gmail.com>
Date: Wed, 1 Jul 2026 00:13:01 +0200
Subject: [PATCH 3/3] feat: handle unknown characters

---
 src/cypher.ts        | 1 +
 src/index.ts         | 4 ++++
 tests/cypher.test.ts | 4 ++++
 3 files changed, 9 insertions(+)

diff --git a/src/cypher.ts b/src/cypher.ts
index 04c2388..dc4d960 100644
--- a/src/cypher.ts
+++ b/src/cypher.ts
@@ -61,6 +61,7 @@ export class Cypher {
     for (let i = 0; i < message.length; i++) {
       const char: string = message.charAt(i);
       const index: number = dictSource.indexOf(char);
+      if(!dictTarget[index]) continue;
       result += dictTarget[index];
     }
     return result;
diff --git a/src/index.ts b/src/index.ts
index a420803..4121ad7 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1 +1,5 @@
+import {Cypher} from "@src/cypher";
+
 console.log('Hello World!');
+const cypher: Cypher = new Cypher();
+console.log(cypher.encrypt('Hello World!'));
diff --git a/tests/cypher.test.ts b/tests/cypher.test.ts
index 2e01819..bf21c57 100644
--- a/tests/cypher.test.ts
+++ b/tests/cypher.test.ts
@@ -42,4 +42,8 @@ describe('Cypher', () => {
     const cypher: Cypher = new Cypher();
     expect(cypher.encrypt('Hello')).toBe('&£aad');
   });
+  it('should handle unknown characters', () => {
+    const cypher: Cypher = new Cypher();
+    expect(cypher.encrypt('Hello !')).toBe('&£aad');
+  });
 });