diff --git a/tests/unit/tts.test.ts b/tests/unit/tts.test.ts
new file mode 100644
index 0000000..b0d6613
--- /dev/null
+++ b/tests/unit/tts.test.ts
@@ -0,0 +1,27 @@
+
+import { vi, beforeEach, expect, test } from 'vitest'
+import { store } from '../../src/services/store'
+import defaults from '../../defaults/settings.json'
+import Tts from '../../src/services/tts'
+
+vi.mock('openai', async () => {
+  const OpenAI = vi.fn()
+  OpenAI.prototype.apiKey = '123'
+  OpenAI.prototype.audio = {
+    speech: {
+      create: vi.fn((opts) => opts.input)
+    }
+  }
+  return { default : OpenAI }
+})
+
+beforeEach(() => {
+  store.config = defaults
+  store.config.engines.openai.apiKey = '123'
+})
+
+test('Synthetizes text', async () => {
+  const tts = new Tts(store.config)
+  const response = await tts.synthetize('hello')
+  expect(response).toStrictEqual({ type: 'audio', content: 'hello' })
+})
diff --git a/vitest.config.mjs b/vitest.config.mjs
index 5c1cc8e..55a842a 100644
--- a/vitest.config.mjs
+++ b/vitest.config.mjs
@@ -24,6 +24,10 @@ export default defineConfig({
     coverage: {
       exclude: [
         ...coverageConfigDefaults.exclude,
+        'src/*.ts',
+        'src/automations/macos*.ts',
+        'src/automations/robot.ts',
+        'src/automations/windows.ts',
         'src/vendor/**/*',
       ]
     },