diff --git a/transcript-orchestration/functions/audio-transcoder/tests/unit/app.test.ts b/transcript-orchestration/functions/audio-transcoder/tests/unit/app.test.ts
index 8f4756a..ac8bb61 100644
--- a/transcript-orchestration/functions/audio-transcoder/tests/unit/app.test.ts
+++ b/transcript-orchestration/functions/audio-transcoder/tests/unit/app.test.ts
@@ -7,7 +7,7 @@ import { sdkStreamMixin } from '@aws-sdk/util-stream-node'
 import { S3Client, PutObjectCommand, GetObjectCommand } from '@aws-sdk/client-s3'
 import { mockedContext } from '../../../mock-utils/lambda-context'
 import { test, expect, vi } from 'vitest'
-process.env.BUCKET_NAME = 'test-bucket'
+
 import * as app from '../../app'
 import * as transcode from '../../transcode'
 
diff --git a/transcript-orchestration/functions/lib/envs.ts b/transcript-orchestration/functions/lib/envs.ts
index 8d077cc..5eaf625 100644
--- a/transcript-orchestration/functions/lib/envs.ts
+++ b/transcript-orchestration/functions/lib/envs.ts
@@ -8,7 +8,7 @@ interface Environment {
  * This eliminates the need to check the existence of each environment variable where it is used.
  */
 const envProxy: Environment = new Proxy({}, {
-  get(target: Record<string, string>, name: string): string {
+  get(_target: Record<string, string>, name: string): string {
     const value = process.env[name]
     if (!value) {
       throw new Error(`Environment variable ${name} is not set`)
diff --git a/transcript-orchestration/functions/s3-keys/tests/unit/app.test.ts b/transcript-orchestration/functions/s3-keys/tests/unit/app.test.ts
index b6c10a3..908d516 100644
--- a/transcript-orchestration/functions/s3-keys/tests/unit/app.test.ts
+++ b/transcript-orchestration/functions/s3-keys/tests/unit/app.test.ts
@@ -1,8 +1,6 @@
 import { test, expect } from 'vitest'
 import { handleEvent, S3KeysEvent } from '../../app'
 
-process.env.BUCKET_NAME = 'test-bucket'
-
 const testState: { options?: S3KeysEvent } = {}
 
 test('constructs keys from audio input key', async (t) => {
diff --git a/transcript-orchestration/functions/transcript-processor/tests/unit/app.test.ts b/transcript-orchestration/functions/transcript-processor/tests/unit/app.test.ts
index cfb56c5..8cf8a5c 100644
--- a/transcript-orchestration/functions/transcript-processor/tests/unit/app.test.ts
+++ b/transcript-orchestration/functions/transcript-processor/tests/unit/app.test.ts
@@ -10,7 +10,6 @@ import { test, assert } from 'vitest'
 import { VocabularySubstitutions } from '../../vocabulary'
 import { MergedTranscript } from '../../types'
 
-process.env.BUCKET_NAME = 'test-bucket'
 import { handleEvent } from '../../app'
 
 const mockS3 = mockClient(S3Client)
diff --git a/transcript-orchestration/tests/setup.ts b/transcript-orchestration/tests/setup.ts
new file mode 100644
index 0000000..8ebed04
--- /dev/null
+++ b/transcript-orchestration/tests/setup.ts
@@ -0,0 +1,3 @@
+export function setup () {
+  process.env.BUCKET_NAME = 'test-bucket'
+}
\ No newline at end of file
diff --git a/transcript-orchestration/vite.config.ts b/transcript-orchestration/vite.config.ts
index 9ec3981..5a75c20 100644
--- a/transcript-orchestration/vite.config.ts
+++ b/transcript-orchestration/vite.config.ts
@@ -2,6 +2,9 @@ import { defineConfig, defaultExclude } from 'vitest/config'
 
 export default defineConfig({
   test: {
+    globalSetup: [
+      './tests/setup.ts'
+    ],
     coverage: {
       reporter: ['text', 'html', 'lcov'],
       exclude: [