diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..b4ea2f0
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,28 @@
+name: CI
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup Bun
+        uses: oven-sh/setup-bun@v1
+        with:
+          bun-version: latest
+
+      - name: Install dependencies
+        run: bun install --frozen-lockfile
+
+      - name: Run linting
+        run: bun run check-all
+
+      - name: Run tests
+        run: bun run test
diff --git a/biome.json b/biome.json
index 191d2e7..9f7df62 100644
--- a/biome.json
+++ b/biome.json
@@ -61,5 +61,17 @@
 				"organizeImports": "on"
 			}
 		}
-	}
+	},
+	"overrides": [
+		{
+			"includes": ["tests/**/*"],
+			"linter": {
+				"rules": {
+					"suspicious": {
+						"noExplicitAny": "off"
+					}
+				}
+			}
+		}
+	]
 }
diff --git a/bun.lock b/bun.lock
index 027ce16..eb7c2c8 100644
--- a/bun.lock
+++ b/bun.lock
@@ -15,6 +15,7 @@
       "devDependencies": {
         "@biomejs/biome": "2.4.15",
         "@types/node": "^22.19.18",
+        "bun-types": "^1.3.13",
         "husky": "^9.1.7",
         "lint-staged": "^17.0.4",
         "typescript": "^5.9.3",
@@ -66,6 +67,8 @@
 
     "ansi-styles": ["ansi-styles@6.2.3", "", {}, "sha512-4Dj6M28JB+oAH8kFkTLUo+a2jwOFkuqb3yucU0CANcRRUbxS0cP0nZYCGjcc3BNXwRIsUVmDGgzawme7zvJHvg=="],
 
+    "bun-types": ["bun-types@1.3.13", "", { "dependencies": { "@types/node": "*" } }, "sha512-QXKeHLlOLqQX9LgYaHJfzdBaV21T63HhFJnvuRCcjZiaUDpbs5ED1MgxbMra71CsryN/1dAoXuJJJwIv/2drVA=="],
+
     "cli-cursor": ["cli-cursor@5.0.0", "", { "dependencies": { "restore-cursor": "^5.0.0" } }, "sha512-aCj4O5wKyszjMmDT4tZj93kxyydN/K5zPWSCe6/0AV/AA1pqe5ZBIw0a2ZfPQV7lL5/yb5HsUreJ6UFAF1tEQw=="],
 
     "cli-truncate": ["cli-truncate@5.2.0", "", { "dependencies": { "slice-ansi": "^8.0.0", "string-width": "^8.2.0" } }, "sha512-xRwvIOMGrfOAnM1JYtqQImuaNtDEv9v6oIYAs4LIHwTiKee8uwvIi363igssOC0O5U04i4AlENs79LQLu9tEMw=="],
diff --git a/bunfig.toml b/bunfig.toml
new file mode 100644
index 0000000..8370a01
--- /dev/null
+++ b/bunfig.toml
@@ -0,0 +1,2 @@
+[test]
+preload = ["./tests/setup.ts"]
diff --git a/package.json b/package.json
index 484e00b..7bc663d 100644
--- a/package.json
+++ b/package.json
@@ -6,6 +6,7 @@
 		"dev": "bun run --hot src/index.ts",
 		"test": "bun test",
 		"lint": "bunx @biomejs/biome check src",
+		"check-all": "bunx @biomejs/biome check .",
 		"format": "bunx @biomejs/biome format --write src",
 		"prepare": "husky"
 	},
@@ -20,6 +21,7 @@
 	"devDependencies": {
 		"@biomejs/biome": "2.4.15",
 		"@types/node": "^22.19.18",
+		"bun-types": "^1.3.13",
 		"husky": "^9.1.7",
 		"lint-staged": "^17.0.4",
 		"typescript": "^5.9.3"
diff --git a/src/index.ts b/src/index.ts
index ea4dbc1..806d1b9 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -65,6 +65,8 @@ app.onError((err, c) => {
 
 app.get("/health", (c) => c.json({ status: "ok" }));
 
+export { app };
+
 export default {
 	port: Number.parseInt(config.PORT, 10),
 	fetch: app.fetch,
diff --git a/src/providers/GenericProvider.ts b/src/providers/GenericProvider.ts
index e2086c3..a1dcc07 100644
--- a/src/providers/GenericProvider.ts
+++ b/src/providers/GenericProvider.ts
@@ -5,7 +5,7 @@ import type { OAuthProvider, TokenResponse } from "./interface";
 const TokenResponseSchema = z.object({
 	access_token: z.string(),
 	refresh_token: z.string().optional(),
-	expires_in: z.number(),
+	expires_in: z.coerce.number(),
 });
 
 export class GenericProvider implements OAuthProvider {
diff --git a/tests/core/ConfigManager.test.ts b/tests/core/ConfigManager.test.ts
new file mode 100644
index 0000000..497370a
--- /dev/null
+++ b/tests/core/ConfigManager.test.ts
@@ -0,0 +1,62 @@
+// @ts-nocheck
+import { describe, expect, it, mock } from "bun:test";
+import { ConfigManager } from "../../src/core/ConfigManager";
+
+describe("ConfigManager", () => {
+	it("should save and retrieve provider configuration", async () => {
+		const storage = {};
+		const redis = {
+			set: mock((key, val) => {
+				storage[key] = val;
+				return Promise.resolve();
+			}),
+			get: mock((key) => Promise.resolve(storage[key] || null)),
+		};
+		const manager = new ConfigManager(redis);
+		const traktConfig = {
+			clientId: "trakt-client-id",
+			clientSecret: "trakt-client-secret",
+			authUrl: "https://trakt.tv/oauth/authorize",
+			tokenUrl: "https://api.trakt.tv/oauth/token",
+			scope: "public",
+		};
+
+		await manager.setProviderConfig("trakt", traktConfig);
+		const retrieved = await manager.getProviderConfig("trakt");
+
+		expect(retrieved).toEqual(traktConfig);
+		expect(redis.set).toHaveBeenCalled();
+	});
+
+	it("should return all providers", async () => {
+		const redis = {
+			keys: mock(() => Promise.resolve(["config:trakt", "config:github"])),
+			get: mock((key) =>
+				Promise.resolve(
+					JSON.stringify({
+						clientId: `${key}-id`,
+						clientSecret: "secret",
+						authUrl: "https://auth.com",
+						tokenUrl: "https://token.com",
+						scope: "all",
+					}),
+				),
+			),
+		};
+		const manager = new ConfigManager(redis);
+
+		const providers = await manager.getAllProviders();
+
+		expect(Object.keys(providers)).toHaveLength(2);
+		expect(providers.trakt.clientId).toBe("config:trakt-id");
+	});
+
+	it("should return null for non-existent provider", async () => {
+		const redis = { get: mock(() => Promise.resolve(null)) };
+		const manager = new ConfigManager(redis);
+
+		const config = await manager.getProviderConfig("missing-provider");
+
+		expect(config).toBeNull();
+	});
+});
diff --git a/tests/core/TokenManager.test.ts b/tests/core/TokenManager.test.ts
index 97c4051..f2456d1 100644
--- a/tests/core/TokenManager.test.ts
+++ b/tests/core/TokenManager.test.ts
@@ -1,65 +1,76 @@
+// @ts-nocheck
 import { describe, expect, it, mock } from "bun:test";
 import { TokenManager } from "../../src/core/TokenManager";
 
 describe("TokenManager", () => {
 	it("should return token from redis if available", async () => {
-		const redisMock = { get: mock(() => Promise.resolve("valid_token")) };
-		const manager = new TokenManager(redisMock as any, {} as any);
+		const redis = { get: mock(() => Promise.resolve("active-access-token")) };
+		const manager = new TokenManager(redis, {});
+
 		const token = await manager.getAccessToken("trakt");
-		expect(token).toBe("valid_token");
+
+		expect(token).toBe("active-access-token");
 	});
 
 	it("should refresh token if access token is missing but refresh token exists", async () => {
-		const redisMock = {
-			get: mock((key: string) => Promise.resolve(key.includes("refresh") ? "refresh_token" : null)),
+		const redis = {
+			get: mock((key) => Promise.resolve(key.includes("refresh") ? "valid-refresh-token" : null)),
 			set: mock(() => Promise.resolve()),
 		};
-		const providerMock = {
+		const provider = {
 			refreshToken: mock(() =>
 				Promise.resolve({
-					accessToken: "new_token",
-					refreshToken: "new_refresh",
+					accessToken: "newly-refreshed-access-token",
+					refreshToken: "newly-refreshed-refresh-token",
 					expiresIn: 3600,
 				}),
 			),
 		};
-		const manager = new TokenManager(redisMock as any, providerMock as any);
+		const manager = new TokenManager(redis, provider);
+
 		const token = await manager.getAccessToken("trakt");
-		expect(token).toBe("new_token");
-		expect(redisMock.set).toHaveBeenCalled();
+
+		expect(token).toBe("newly-refreshed-access-token");
+		expect(redis.set).toHaveBeenCalled();
 	});
 
 	it("should return null if no tokens are found", async () => {
-		const redisMock = { get: mock(() => Promise.resolve(null)) };
-		const manager = new TokenManager(redisMock as any, {} as any);
+		const redis = { get: mock(() => Promise.resolve(null)) };
+		const manager = new TokenManager(redis, {});
+
 		const token = await manager.getAccessToken("trakt");
+
 		expect(token).toBeNull();
 	});
 
-	it("should refresh token via forceRefresh", async () => {
-		const redisMock = {
-			get: mock(() => Promise.resolve("refresh_token")),
+	it("should refresh token via refreshAccessToken", async () => {
+		const redis = {
+			get: mock(() => Promise.resolve("existing-refresh-token")),
 			set: mock(() => Promise.resolve()),
 		};
-		const providerMock = {
+		const provider = {
 			refreshToken: mock(() =>
 				Promise.resolve({
-					accessToken: "forced_token",
-					refreshToken: "new_refresh",
+					accessToken: "manually-refreshed-access-token",
+					refreshToken: "manually-refreshed-refresh-token",
 					expiresIn: 3600,
 				}),
 			),
 		};
-		const manager = new TokenManager(redisMock as any, providerMock as any);
-		const token = await manager.forceRefresh("trakt");
-		expect(token).toBe("forced_token");
-		expect(providerMock.refreshToken).toHaveBeenCalledWith("refresh_token");
+		const manager = new TokenManager(redis, provider);
+
+		const token = await manager.refreshAccessToken("trakt");
+
+		expect(token).toBe("manually-refreshed-access-token");
+		expect(provider.refreshToken).toHaveBeenCalledWith("existing-refresh-token");
 	});
 
-	it("should return null in forceRefresh if no refresh token is found", async () => {
-		const redisMock = { get: mock(() => Promise.resolve(null)) };
-		const manager = new TokenManager(redisMock as any, {} as any);
-		const token = await manager.forceRefresh("trakt");
+	it("should return null in refreshAccessToken if no refresh token is found", async () => {
+		const redis = { get: mock(() => Promise.resolve(null)) };
+		const manager = new TokenManager(redis, {});
+
+		const token = await manager.refreshAccessToken("trakt");
+
 		expect(token).toBeNull();
 	});
 });
diff --git a/tests/integration/api.test.ts b/tests/integration/api.test.ts
new file mode 100644
index 0000000..f455100
--- /dev/null
+++ b/tests/integration/api.test.ts
@@ -0,0 +1,135 @@
+// @ts-nocheck
+import { afterEach, describe, expect, it, mock, spyOn } from "bun:test";
+import { redis } from "../../src/core/RedisClient";
+import { app } from "../../src/index";
+
+describe("API Integration", () => {
+	afterEach(() => {
+		mock.restore();
+		redis.get.mockImplementation(() => Promise.resolve(null));
+		redis.set.mockImplementation(() => Promise.resolve());
+		redis.keys.mockImplementation(() => Promise.resolve([]));
+	});
+
+	const mockTraktConfig = JSON.stringify({
+		clientId: "trakt-client-id",
+		clientSecret: "trakt-client-secret",
+		authUrl: "https://trakt.tv/oauth/authorize",
+		tokenUrl: "https://api.trakt.tv/oauth/token",
+		scope: "public",
+	});
+
+	it("should return 401 if API Key is missing", async () => {
+		const res = await app.request("/api/status");
+
+		expect(res.status).toBe(401);
+		const body = await res.json();
+		expect(body).toEqual({ error: "Missing or invalid authorization header" });
+	});
+
+	it("should return 200 for health check (no auth needed)", async () => {
+		const res = await app.request("/health");
+
+		expect(res.status).toBe(200);
+		const body = await res.json();
+		expect(body.status).toBe("ok");
+	});
+
+	it("should return 200 for status with valid API Key", async () => {
+		redis.keys.mockReturnValue(Promise.resolve(["config:trakt"]));
+		redis.get.mockImplementation((key) => {
+			if (key.includes("config")) return Promise.resolve(mockTraktConfig);
+			if (key.includes("access_token")) return Promise.resolve("current-access-token");
+			if (key.includes("refresh_token")) return Promise.resolve("current-refresh-token");
+			return Promise.resolve(null);
+		});
+
+		const res = await app.request("/api/status", {
+			headers: {
+				Authorization: "Bearer test-api-key",
+			},
+		});
+
+		expect(res.status).toBe(200);
+		const body = await res.json();
+		expect(body.trakt).toBeDefined();
+		expect(body.trakt.accessToken).toBe("current-access-token");
+	});
+
+	it("should return 404 for unknown provider token", async () => {
+		const res = await app.request("/api/token/unconfigured-provider", {
+			headers: {
+				Authorization: "Bearer test-api-key",
+			},
+		});
+
+		expect(res.status).toBe(404);
+	});
+
+	it("should return token for a configured provider", async () => {
+		redis.get.mockImplementation((key) => {
+			if (key.includes("config:trakt")) return Promise.resolve(mockTraktConfig);
+			if (key.includes("access_token")) return Promise.resolve("trakt-active-token");
+			return Promise.resolve(null);
+		});
+
+		const res = await app.request("/api/token/trakt", {
+			headers: {
+				Authorization: "Bearer test-api-key",
+			},
+		});
+
+		expect(res.status).toBe(200);
+		const body = await res.json();
+		expect(body.access_token).toBe("trakt-active-token");
+	});
+
+	it("should return 404 if no access token is in redis for a valid provider", async () => {
+		redis.get.mockImplementation((key) => {
+			if (key.includes("config:trakt")) return Promise.resolve(mockTraktConfig);
+			return Promise.resolve(null);
+		});
+
+		const res = await app.request("/api/token/trakt", {
+			headers: {
+				Authorization: "Bearer test-api-key",
+			},
+		});
+
+		expect(res.status).toBe(404);
+		const body = await res.json();
+		expect(body.error).toContain("No tokens found");
+	});
+
+	it("should successfully refresh a token", async () => {
+		redis.get.mockImplementation((key) => {
+			if (key.includes("config:trakt")) return Promise.resolve(mockTraktConfig);
+			if (key.includes("refresh_token")) return Promise.resolve("old-refresh-token");
+			return Promise.resolve("new-access-token-from-refresh");
+		});
+
+		spyOn(globalThis, "fetch").mockImplementation(() =>
+			Promise.resolve({
+				ok: true,
+				json: () =>
+					Promise.resolve({
+						access_token: "new-access-token-from-fetch",
+						refresh_token: "new-refresh-token-from-fetch",
+						expires_in: 3600,
+					}),
+			}),
+		);
+
+		const res = await app.request("/api/refresh/trakt", {
+			method: "POST",
+			headers: {
+				Authorization: "Bearer test-api-key",
+			},
+		});
+
+		expect(res.status).toBe(200);
+		const body = await res.json();
+		expect(body.success).toBe(true);
+		expect(body.status.accessToken).toBe("new-access-token-from-refresh");
+	});
+});
diff --git a/tests/integration/auth.test.ts b/tests/integration/auth.test.ts
new file mode 100644
index 0000000..f342b58
--- /dev/null
+++ b/tests/integration/auth.test.ts
@@ -0,0 +1,71 @@
+// @ts-nocheck
+import { afterEach, describe, expect, it, mock, spyOn } from "bun:test";
+import { redis } from "../../src/core/RedisClient";
+import { app } from "../../src/index";
+
+describe("Auth Integration", () => {
+	afterEach(() => {
+		mock.restore();
+		redis.get.mockImplementation(() => Promise.resolve(null));
+	});
+
+	const mockProviderConfig = JSON.stringify({
+		clientId: "trakt-client-id",
+		clientSecret: "trakt-client-secret",
+		authUrl: "https://trakt.tv/oauth/authorize",
+		tokenUrl: "https://api.trakt.tv/oauth/token",
+		scope: "public",
+	});
+
+	it("should redirect to provider login", async () => {
+		redis.get.mockImplementation((key) => {
+			if (key.includes("config:trakt")) return Promise.resolve(mockProviderConfig);
+			return Promise.resolve(null);
+		});
+
+		const res = await app.request("/auth/trakt/login");
+
+		expect(res.status).toBe(302);
+		expect(res.headers.get("Location")).toContain("trakt.tv/oauth/authorize");
+		expect(res.headers.get("Location")).toContain("client_id=trakt-client-id");
+	});
+
+	it("should handle callback and exchange code", async () => {
+		redis.get.mockImplementation((key) => {
+			if (key.includes("config:trakt")) return Promise.resolve(mockProviderConfig);
+			return Promise.resolve(null);
+		});
+
+		const fetchSpy = spyOn(globalThis, "fetch").mockImplementation(() =>
+			Promise.resolve({
+				ok: true,
+				json: () =>
+					Promise.resolve({
+						access_token: "exchange-access-token",
+						refresh_token: "exchange-refresh-token",
+						expires_in: 3600,
+					}),
+			}),
+		);
+
+		const res = await app.request("/auth/callback?state=trakt&code=temporary-auth-code");
+
+		expect(res.status).toBe(200);
+		const html = await res.text();
+		expect(html).toContain("trakt");
+		expect(redis.set).toHaveBeenCalled();
+		expect(fetchSpy).toHaveBeenCalled();
+	});
+
+	it("should return 404 if provider not configured during login", async () => {
+		const res = await app.request("/auth/unknown-provider/login");
+
+		expect(res.status).toBe(404);
+	});
+
+	it("should return 400 if callback is missing state or code", async () => {
+		const res = await app.request("/auth/callback?code=some-code");
+
+		expect(res.status).toBe(400);
+	});
+});
diff --git a/tests/integration/config.test.ts b/tests/integration/config.test.ts
new file mode 100644
index 0000000..68fcbcd
--- /dev/null
+++ b/tests/integration/config.test.ts
@@ -0,0 +1,81 @@
+// @ts-nocheck
+import { afterEach, describe, expect, it, mock } from "bun:test";
+import { redis } from "../../src/core/RedisClient";
+import { app } from "../../src/index";
+
+describe("Config Integration", () => {
+	afterEach(() => {
+		mock.restore();
+		redis.get.mockImplementation(() => Promise.resolve(null));
+		redis.set.mockImplementation(() => Promise.resolve());
+		redis.keys.mockImplementation(() => Promise.resolve([]));
+	});
+
+	it("should list all configured providers", async () => {
+		redis.keys.mockReturnValue(Promise.resolve(["config:trakt"]));
+		redis.get.mockImplementation(() =>
+			Promise.resolve(
+				JSON.stringify({
+					clientId: "trakt-client-id",
+					clientSecret: "trakt-client-secret",
+					authUrl: "https://trakt.tv/oauth/authorize",
+					tokenUrl: "https://api.trakt.tv/oauth/token",
+					scope: "public",
+				}),
+			),
+		);
+
+		const res = await app.request("/api/config", {
+			headers: {
+				Authorization: "Bearer test-api-key",
+			},
+		});
+
+		expect(res.status).toBe(200);
+		const body = await res.json();
+		expect(body.trakt).toBeDefined();
+		expect(body.trakt.clientId).toBe("trakt-client-id");
+	});
+
+	it("should set a new provider config", async () => {
+		const newProviderConfig = {
+			clientId: "github-client-id",
+			clientSecret: "github-client-secret",
+			authUrl: "https://github.com/login/oauth/authorize",
+			tokenUrl: "https://github.com/login/oauth/access_token",
+			scope: "user:email",
+		};
+
+		const res = await app.request("/api/config/github", {
+			method: "POST",
+			headers: {
+				Authorization: "Bearer test-api-key",
+				"Content-Type": "application/json",
+			},
+			body: JSON.stringify(newProviderConfig),
+		});
+
+		expect(res.status).toBe(200);
+		expect(redis.set).toHaveBeenCalledWith(
+			"config:github",
+			expect.stringContaining("github-client-id"),
+		);
+	});
+
+	it("should return 400 for invalid config body", async () => {
+		const invalidConfig = {
+			clientId: "missing-other-required-fields",
+		};
+
+		const res = await app.request("/api/config/invalid", {
+			method: "POST",
+			headers: {
+				Authorization: "Bearer test-api-key",
+				"Content-Type": "application/json",
+			},
+			body: JSON.stringify(invalidConfig),
+		});
+
+		expect(res.status).toBe(400);
+	});
+});
diff --git a/tests/integration/dashboard.test.ts b/tests/integration/dashboard.test.ts
new file mode 100644
index 0000000..507f952
--- /dev/null
+++ b/tests/integration/dashboard.test.ts
@@ -0,0 +1,37 @@
+// @ts-nocheck
+import { describe, expect, it } from "bun:test";
+import { redis } from "../../src/core/RedisClient";
+import { app } from "../../src/index";
+
+describe("Dashboard & Common Integration", () => {
+	it("should serve the dashboard HTML", async () => {
+		const res = await app.request("/app");
+
+		expect(res.status).toBe(200);
+		expect(res.headers.get("Content-Type")).toContain("text/html");
+		const html = await res.text();
+		expect(html).toContain("<!DOCTYPE html>");
+	});
+
+	it("should return 404 with custom handler for unknown routes", async () => {
+		const res = await app.request("/unknown-route");
+
+		expect(res.status).toBe(404);
+		const body = await res.json();
+		expect(body.error).toBe("Not Found");
+	});
+
+	it("should return 500 for internal errors", async () => {
+		redis.keys.mockImplementationOnce(() => {
+			throw new Error("Redis Crash");
+		});
+
+		const res = await app.request("/api/status", {
+			headers: { Authorization: "Bearer test-api-key" },
+		});
+
+		expect(res.status).toBe(500);
+		const body = await res.json();
+		expect(body.error).toBe("Internal Server Error");
+	});
+});
diff --git a/tests/providers/GenericProvider.test.ts b/tests/providers/GenericProvider.test.ts
new file mode 100644
index 0000000..e8e86b8
--- /dev/null
+++ b/tests/providers/GenericProvider.test.ts
@@ -0,0 +1,69 @@
+// @ts-nocheck
+import { afterEach, describe, expect, it, mock, spyOn } from "bun:test";
+import { GenericProvider } from "../../src/providers/GenericProvider";
+
+describe("GenericProvider", () => {
+	const traktConfig = {
+		clientId: "trakt-client-id",
+		clientSecret: "trakt-client-secret",
+		authUrl: "https://trakt.tv/oauth/authorize",
+		tokenUrl: "https://api.trakt.tv/oauth/token",
+		scope: "public",
+	};
+
+	afterEach(() => {
+		mock.restore();
+	});
+
+	it("should generate correct auth URL", () => {
+		const provider = new GenericProvider("trakt", traktConfig);
+
+		const url = provider.getAuthUrl("random-state-123", "https://callback.com");
+
+		expect(url).toContain("client_id=trakt-client-id");
+		expect(url).toContain("redirect_uri=https%3A%2F%2Fcallback.com");
+		expect(url).toContain("state=random-state-123");
+	});
+
+	it("should handle token response with string expiry", async () => {
+		const provider = new GenericProvider("trakt", traktConfig);
+		const fetchSpy = spyOn(globalThis, "fetch").mockImplementation(() =>
+			Promise.resolve({
+				ok: true,
+				json: () =>
+					Promise.resolve({
+						access_token: "new-access-token",
+						refresh_token: "new-refresh-token",
+						expires_in: "7200",
+					}),
+				text: () => Promise.resolve(""),
+			}),
+		);
+
+		const tokens = await provider.refreshToken("old-refresh-token");
+
+		expect(tokens.accessToken).toBe("new-access-token");
+		expect(tokens.expiresIn).toBe(7200);
+		expect(fetchSpy).toHaveBeenCalled();
+	});
+
+	it("should handle token response without new refresh token", async () => {
+		const provider = new GenericProvider("trakt", traktConfig);
+		spyOn(globalThis, "fetch").mockImplementation(() =>
+			Promise.resolve({
+				ok: true,
+				json: () =>
+					Promise.resolve({
+						access_token: "new-access-token-only",
+						expires_in: 3600,
+					}),
+				text: () => Promise.resolve(""),
+			}),
+		);
+
+		const tokens = await provider.refreshToken("existing-refresh-token");
+
+		expect(tokens.accessToken).toBe("new-access-token-only");
+		expect(tokens.refreshToken).toBe("existing-refresh-token");
+	});
+});
diff --git a/tests/setup.ts b/tests/setup.ts
new file mode 100644
index 0000000..883bb21
--- /dev/null
+++ b/tests/setup.ts
@@ -0,0 +1,15 @@
+import { mock } from "bun:test";
+
+// Global test setup to stub environment variables
+process.env.API_KEY = "test-api-key";
+process.env.REDIS_URL = "redis://localhost:6379";
+process.env.PORT = "3000";
+
+// Global Redis mock
+mock.module("../src/core/RedisClient", () => ({
+	redis: {
+		get: mock(() => Promise.resolve(null)),
+		set: mock(() => Promise.resolve()),
+		keys: mock(() => Promise.resolve([])),
+	},
+}));
diff --git a/tsconfig.json b/tsconfig.json
index 6e0daff..1fac6c7 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -6,7 +6,7 @@
 		"strict": true,
 		"skipLibCheck": true,
 		"lib": ["ESNext"],
-		"types": ["node"]
+		"types": ["node", "bun-types"]
 	},
-	"include": ["src/**/*"]
+	"include": ["src/**/*", "tests/**/*"]
 }