diff --git a/server/test/setup.ts b/server/test/setup.ts
new file mode 100644
index 0000000..4bb1fa8
--- /dev/null
+++ b/server/test/setup.ts
@@ -0,0 +1,22 @@
+import { mkdtempSync, rmSync } from 'node:fs'
+import { tmpdir } from 'node:os'
+import { join } from 'node:path'
+import { afterAll, beforeAll } from 'vitest'
+import { closeDb } from '../utils/db'
+
+const workerId = process.env.VITEST_POOL_ID ?? String(process.pid)
+const dataDir = mkdtempSync(join(tmpdir(), `pichost-test-${workerId}-`))
+process.env.DATA_DIR = dataDir
+
+beforeAll(() => {
+  closeDb()
+})
+
+afterAll(() => {
+  closeDb()
+  try {
+    rmSync(dataDir, { recursive: true, force: true })
+  } catch {
+    // Windows may still hold the sqlite file for a moment after close
+  }
+})
diff --git a/server/utils/host-isolation.test.ts b/server/utils/host-isolation.test.ts
index d06aa8f..9926759 100644
--- a/server/utils/host-isolation.test.ts
+++ b/server/utils/host-isolation.test.ts
@@ -131,7 +131,8 @@ describe('shouldBlockSiteHostImageRequest', () => {
       siteHost,
       requestHost: siteHost,
       method: 'GET',
-      pathname: '/'
+      pathname: '/',
+      hideFolder: false
     })).toBe(false)
   })
 
diff --git a/vitest.config.ts b/vitest.config.ts
index 6a49674..2289f92 100644
--- a/vitest.config.ts
+++ b/vitest.config.ts
@@ -3,6 +3,8 @@ import { defineConfig } from 'vitest/config'
 export default defineConfig({
   test: {
     environment: 'node',
-    include: ['server/**/*.test.ts']
+    include: ['server/**/*.test.ts'],
+    pool: 'forks',
+    setupFiles: ['./server/test/setup.ts']
   }
 })