diff --git a/packages/test-integration/test/PreviewProcessPortConflict.test.ts b/packages/test-integration/test/PreviewProcessPortConflict.test.ts
new file mode 100644
index 00000000..b73d10bf
--- /dev/null
+++ b/packages/test-integration/test/PreviewProcessPortConflict.test.ts
@@ -0,0 +1,21 @@
+import { expect, test } from '@jest/globals'
+import getPort from 'get-port'
+import { createPreviewProcess } from '../src/parts/CreatePreviewProcess/CreatePreviewProcess.js'
+
+test('preview process - handles port already in use', async () => {
+  const previewProcess1 = createPreviewProcess()
+  const previewProcess2 = createPreviewProcess()
+  const id = 1
+  const port = await getPort()
+
+  await previewProcess1.invoke('WebViewServer.create', id)
+  await previewProcess1.invoke('WebViewServer.start', id, port)
+
+  // TODO improve error message
+  await expect(previewProcess2.invoke('WebViewServer.start', id, port)).rejects.toThrow(
+    "Failed to start webview server: TypeError: Cannot read properties of undefined (reading 'server')",
+  )
+
+  previewProcess1[Symbol.dispose]()
+  previewProcess2[Symbol.dispose]()
+})