diff --git a/.env.test b/.env.test
new file mode 100644
index 0000000..14f66f5
--- /dev/null
+++ b/.env.test
@@ -0,0 +1,9 @@
+LOG_LEVEL=debug
+TS3_HOST=fake
+TS3_USERNAME=fake
+TS3_PASSWORD=fake
+TS3_NICKNAME=fake
+GOTIFY_URL=https://example.com
+GOTIFY_TOKEN=fake
+GOTIFY_TITLE=fake
+MODE='[]'
diff --git a/.gitea/workflows/cd.yaml b/.gitea/workflows/cd.yaml
index 93f7429..c25e48f 100644
--- a/.gitea/workflows/cd.yaml
+++ b/.gitea/workflows/cd.yaml
@@ -29,6 +29,9 @@ jobs:
       - name: Run spellcheck
         run: bun run check:spell
 
+      - name: Run tests
+        run: bun test:unit
+
   build_and_push:
     name: Build and push
     strategy:
diff --git a/.gitea/workflows/ci.yaml b/.gitea/workflows/ci.yaml
index 8161222..0519cbb 100644
--- a/.gitea/workflows/ci.yaml
+++ b/.gitea/workflows/ci.yaml
@@ -23,3 +23,6 @@ jobs:
 
       - name: Run spellcheck
         run: bun run check:spell
+
+      - name: Run tests
+        run: bun test:unit
diff --git a/package.json b/package.json
index 868d630..0be6eef 100644
--- a/package.json
+++ b/package.json
@@ -3,6 +3,7 @@
     "build": "bun build --minify --target bun --outdir dist --sourcemap src/app.ts",
     "check:code": "eslint src/ --ext .ts",
     "check:spell": "cspell --config cspell.code.json **/*.ts",
+    "test:unit": "NODE_ENV=test bun test",
     "start": "bun run src/app.ts"
   },
   "devDependencies": {
diff --git a/src/app.test.ts b/src/app.test.ts
new file mode 100644
index 0000000..e5a5af5
--- /dev/null
+++ b/src/app.test.ts
@@ -0,0 +1,22 @@
+import { test, expect } from "bun:test";
+import { getModes } from "./app";
+
+test("getModes", () => {
+  test("defaults to false", () => {
+    expect(getModes([])).toEqual({
+      connect: false,
+      disconnect: false,
+      moved: false,
+      message: false,
+    });
+  });
+
+  test("modes are true if set in input", () => {
+    expect(getModes(["connect", "moved"])).toEqual({
+      connect: true,
+      disconnect: false,
+      moved: false,
+      message: false,
+    });
+  });
+});
diff --git a/src/app.ts b/src/app.ts
index 897ab56..46e90ef 100644
--- a/src/app.ts
+++ b/src/app.ts
@@ -36,12 +36,16 @@ const gotifyConfig = {
   title: GOTIFY_TITLE,
 };
 
-function getModes(): {
+export function getModes(modeInput: Mode[]): {
   [key in Mode]: boolean;
 } {
-  const modes = MODE.map((mode) => {
-    return { [mode]: true };
-  });
+  const modes = modeInput
+    .map((mode) => {
+      return { [mode]: true };
+    })
+    .reduce((acc, cur) => {
+      return { ...acc, ...cur };
+    });
 
   return {
     connect: false,
@@ -87,11 +91,11 @@ TeamSpeak.connect({
   password: TS3_PASSWORD,
   nickname: TS3_NICKNAME,
 }).then((teamspeak) => {
-  const mode = getModes();
+  const mode = getModes(MODE);
 
   logger.info(
     `connected to TS3 in modes: ${Object.entries(mode)
-      .filter(([_, value]) => value)
+      .filter(([, value]) => value)
       .map(([key]) => key)
       .join(", ")}`
   );