diff --git a/README.md b/README.md
index 7783c5f..38f23ef 100644
--- a/README.md
+++ b/README.md
@@ -38,7 +38,7 @@ Both RedisService and HttpServer are implemented as singletons:
   Example: Testing `RedisService.lpush` with a mocked Redis client.
 
 ```ts
-test("should call lPush on the client", async () => {
+test("Should call lPush on the client", async () => {
   const fakeClient = {
     lPush: mock(async () => 1),
   };
diff --git a/package.json b/package.json
index 3c88644..68c0d8b 100644
--- a/package.json
+++ b/package.json
@@ -8,7 +8,8 @@
     "start": "bun index.ts",
     "test": "bun test",
     "build": "bun build index.ts --outdir dist --minify --target bun",
-    "format": "npx prettier --write ."
+    "format": "npx prettier --write .",
+    "coverage": "bun test --coverage"
   },
   "devDependencies": {
     "@types/bun": "latest",
diff --git a/test/e2e/messagesApi.test.ts b/test/e2e/messagesApi.test.ts
index eddd430..7562b90 100644
--- a/test/e2e/messagesApi.test.ts
+++ b/test/e2e/messagesApi.test.ts
@@ -3,8 +3,8 @@ import {
   test,
   expect,
   beforeAll,
-  afterAll,
   beforeEach,
+  afterAll,
 } from "bun:test";
 import { RedisService } from "../../src/services/redisService.ts";
 import { HttpServer } from "../../src/http/server.ts";
@@ -20,16 +20,16 @@ describe("Messages API – End-to-End Tests", () => {
     await HttpServer.start();
   });
 
-  beforeEach(async () => {
-    // Reset Redis database before each test
-    await RedisService.op().flushAll();
-  });
-
   afterAll(async () => {
     await RedisService.stop();
     await HttpServer.stop();
   });
 
+  beforeEach(async () => {
+    // Reset Redis database before each test
+    await RedisService.op().flushAll();
+  });
+
   describe("GET /messages endpoint", async () => {
     test("Should return an empty list when no messages are stored", async () => {
       const response = await axios.get<GetMessagesResponse>(
@@ -124,7 +124,7 @@ describe("Messages API – End-to-End Tests", () => {
       );
     });
 
-    test("should handle multiple POST requests at the same time without losing messages", async () => {
+    test("Should handle multiple POST requests at the same time without losing messages", async () => {
       const messages = ["msg1", "msg2", "msg3", "msg4", "msg5"];
 
       await Promise.all(
diff --git a/test/example.test.ts b/test/example.test.ts
index 56e0b87..d59d918 100644
--- a/test/example.test.ts
+++ b/test/example.test.ts
@@ -1,7 +1,7 @@
 import { describe, test, expect } from "bun:test";
 
 describe("Math utilities – basic operations", () => {
-  test("should correctly sum two positive integers", () => {
+  test("Should correctly sum two positive integers", () => {
     const a = 2;
     const b = 2;
     const result = a + b;
diff --git a/test/integration/messageRoutes.test.ts b/test/integration/messageRoutes.test.ts
index 826ab05..205fb2f 100644
--- a/test/integration/messageRoutes.test.ts
+++ b/test/integration/messageRoutes.test.ts
@@ -1,4 +1,4 @@
-import { describe, test, expect, afterAll, beforeAll } from "bun:test";
+import { describe, test, expect, beforeAll, afterAll } from "bun:test";
 import { messageRoutes } from "../../src/routes/messages";
 import { RedisService } from "../../src/services/redisService.ts";
 import type { ErrorResponse, GetMessagesResponse } from "../utils/types.ts";
diff --git a/test/integration/redisService.test.ts b/test/integration/redisService.test.ts
new file mode 100644
index 0000000..44b96d8
--- /dev/null
+++ b/test/integration/redisService.test.ts
@@ -0,0 +1,89 @@
+import { describe, test, expect, beforeAll } from "bun:test";
+import { RedisService } from "../../src/services/redisService";
+
+describe("Redis Service – Integration Tests", () => {
+  beforeAll(async () => {
+    await RedisService.start();
+    await RedisService.op().del("messages");
+  });
+
+  test("Should connect and return a working Redis instance", async () => {
+    const pong = await RedisService.op().ping();
+    expect(pong).toBe("PONG");
+  });
+
+  test("Should push a message into Redis list", async () => {
+    const result = await RedisService.lpush("messages", "hello");
+    expect(typeof result).toBe("number");
+    expect(result).toBeGreaterThan(0);
+
+    const stored = await RedisService.lrange("messages", 0, -1);
+    expect(stored).toContain("hello");
+  });
+
+  test("Should push multiple messages and maintain order (LIFO)", async () => {
+    await RedisService.op().del("messages");
+
+    await RedisService.lpush("messages", "A");
+    await RedisService.lpush("messages", "B");
+    await RedisService.lpush("messages", "C");
+
+    const stored = await RedisService.lrange("messages", 0, -1);
+    expect(stored).toEqual(["C", "B", "A"]);
+  });
+
+  test("Should return empty array when key does not exist", async () => {
+    await RedisService.op().del("unknown");
+
+    const stored = await RedisService.lrange("unknown", 0, -1);
+    expect(stored).toEqual([]);
+  });
+
+  test("Should delete the list successfully", async () => {
+    await RedisService.lpush("messages", "to_delete");
+    const del = await RedisService.op().del("messages");
+
+    expect(del).toBe(1);
+
+    const after = await RedisService.lrange("messages", 0, -1);
+    expect(after).toEqual([]);
+  });
+
+  test("Should handle empty string pushes", async () => {
+    await RedisService.op().del("messages");
+
+    await RedisService.lpush("messages", "");
+    const stored = await RedisService.lrange("messages", 0, -1);
+
+    expect(stored).toEqual([""]);
+  });
+
+  test("Should throw an error when pushing without Redis started", async () => {
+    await RedisService.stop();
+
+    try {
+      await RedisService.lpush("messages", "fail");
+    } catch (err) {
+      expect((err as Error).message.toLowerCase()).toContain(
+        "the client is closed",
+      );
+    } finally {
+      await RedisService.start();
+    }
+  });
+
+  test("Should allow multiple concurrent pushes without losing data", async () => {
+    await RedisService.op().del("messages");
+
+    const messages = Array.from({ length: 50 }, (_, i) => `msg_${i}`);
+
+    await Promise.all(messages.map((m) => RedisService.lpush("messages", m)));
+
+    const stored = await RedisService.lrange("messages", 0, -1);
+
+    messages.forEach((m) => {
+      expect(stored).toContain(m);
+    });
+    expect(stored.length).toBe(50);
+  });
+});
diff --git a/test/unit/redisService.test.ts b/test/unit/redisService.test.ts
index c9f1ddd..0940ddd 100644
--- a/test/unit/redisService.test.ts
+++ b/test/unit/redisService.test.ts
@@ -6,7 +6,7 @@ describe("RedisService - Unit tests", () => {
     (RedisService as any).client = null;
   });
 
-  test("should call lPush on the client", async () => {
+  test("Should call lPush on the client", async () => {
     const fakeClient = {
       lPush: mock(async () => 1),
     };
@@ -19,7 +19,7 @@ describe("RedisService - Unit tests", () => {
     expect(fakeClient.lPush).toHaveBeenCalledWith("messages", "hello");
   });
 
-  test("should call lRange on the client", async () => {
+  test("Should call lRange on the client", async () => {
     const fakeClient = {
       lRange: mock(async () => ["hi"]),
     };
@@ -33,7 +33,7 @@ describe("RedisService - Unit tests", () => {
     expect(result).toEqual(["hi"]);
   });
 
-  test("should return 15 items from 0 to 14", async () => {
+  test("Should return 15 items from 0 to 14", async () => {
     const fakeClient = {
       lRange: mock(async () =>
         Array.from({ length: 15 }, (_, i) => `msg-${i}`),
diff --git a/tsconfig.json b/tsconfig.json
index bfa0fea..c89d33b 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -1,6 +1,5 @@
 {
   "compilerOptions": {
-    // Environment setup & latest features
     "lib": ["ESNext"],
     "target": "ESNext",
     "module": "Preserve",
@@ -8,22 +7,21 @@
     "jsx": "react-jsx",
     "allowJs": true,
 
-    // Bundler mode
     "moduleResolution": "bundler",
     "allowImportingTsExtensions": true,
     "verbatimModuleSyntax": true,
     "noEmit": true,
 
-    // Best practices
     "strict": true,
     "skipLibCheck": true,
     "noFallthroughCasesInSwitch": true,
     "noUncheckedIndexedAccess": true,
     "noImplicitOverride": true,
 
-    // Some stricter flags (disabled by default)
     "noUnusedLocals": false,
     "noUnusedParameters": false,
     "noPropertyAccessFromIndexSignature": false
-  }
+  },
+  "include": ["src/**/*.ts"],
+  "exclude": ["node_modules", "tests"]
 }