diff --git a/packages/trilium-core/package.json b/packages/trilium-core/package.json
index 70044b5b16..149d67605d 100644
--- a/packages/trilium-core/package.json
+++ b/packages/trilium-core/package.json
@@ -4,7 +4,8 @@
   "description": "",
   "main": "src/index.ts",
   "scripts": {
-    "test": "echo \"Error: no test specified\" && exit 1"
+    "test": "vitest",
+    "coverage": "vitest --coverage"
   },
   "dependencies": {
     "@braintree/sanitize-url": "7.1.1",
@@ -21,6 +22,7 @@
   "devDependencies": {
     "@types/escape-html": "1.0.4",
     "@types/mime-types": "3.0.1",
-    "@types/sanitize-html": "2.16.1"
+    "@types/sanitize-html": "2.16.1",
+    "vite": "8.0.2"
   }
 }
diff --git a/packages/trilium-core/spec/setup.ts b/packages/trilium-core/spec/setup.ts
new file mode 100644
index 0000000000..e7e241cf3c
--- /dev/null
+++ b/packages/trilium-core/spec/setup.ts
@@ -0,0 +1,30 @@
+import { beforeAll } from "vitest";
+import i18next from "i18next";
+import { join } from "path";
+import { setDayjsLocale } from "@triliumnext/commons";
+
+// Initialize environment variables.
+process.env.TRILIUM_DATA_DIR = join(__dirname, "../../apps/server/spec/db");
+process.env.TRILIUM_RESOURCE_DIR = join(__dirname, "../src");
+process.env.TRILIUM_INTEGRATION_TEST = "memory";
+process.env.TRILIUM_ENV = "dev";
+process.env.TRILIUM_PUBLIC_SERVER = "http://localhost:4200";
+
+beforeAll(async () => {
+    // Initialize the translations manually to avoid any side effects.
+    const Backend = (await import("i18next-fs-backend")).default;
+
+    // Initialize translations
+    await i18next.use(Backend).init({
+        lng: "en",
+        fallbackLng: "en",
+        ns: "server",
+        backend: {
+            loadPath: join(__dirname, "../src/assets/translations/{{lng}}/{{ns}}.json")
+        },
+        showSupportNotice: false
+    });
+
+    // Initialize dayjs
+    await setDayjsLocale("en");
+});
diff --git a/apps/server/vite.config.mts b/packages/trilium-core/vite.config.mts
similarity index 88%
rename from apps/server/vite.config.mts
rename to packages/trilium-core/vite.config.mts
index 2fa10ff798..3210e7a9b3 100644
--- a/apps/server/vite.config.mts
+++ b/packages/trilium-core/vite.config.mts
@@ -3,7 +3,7 @@ import { defineConfig } from 'vite';
 
 export default defineConfig(() => ({
   root: __dirname,
-  cacheDir: '../../node_modules/.vite/apps/server',
+  cacheDir: '../../node_modules/.vite/packages/trilium-core',
   plugins: [],
   test: {
     watch: false,
@@ -16,9 +16,6 @@ export default defineConfig(() => ({
       TRILIUM_INTEGRATION_TEST: "memory"
     },
     include: ['{src,spec}/**/*.{test,spec}.{js,mjs,cjs,ts,mts,cts,jsx,tsx}'],
-    exclude: [
-      "spec/build-checks/**",
-    ],
     hookTimeout: 20_000,
     testTimeout: 40_000,
     reporters: [
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 1354f489e7..1054e48960 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -1738,6 +1738,9 @@ importers:
       '@types/sanitize-html':
         specifier: 2.16.1
         version: 2.16.1
+      vite:
+        specifier: 8.0.2
+        version: 8.0.2(@types/node@24.12.0)(esbuild@0.27.4)(jiti@2.6.1)(less@4.1.3)(sass-embedded@1.91.0)(sass@1.91.0)(terser@5.44.0)(tsx@4.21.0)(yaml@2.8.2)
 
   packages/turndown-plugin-gfm:
     devDependencies:
@@ -17276,6 +17279,8 @@ snapshots:
       '@ckeditor/ckeditor5-utils': 47.6.1
       '@ckeditor/ckeditor5-widget': 47.6.1
       es-toolkit: 1.39.5
+    transitivePeerDependencies:
+      - supports-color
 
   '@ckeditor/ckeditor5-cloud-services@47.6.1':
     dependencies:
@@ -17866,8 +17871,6 @@ snapshots:
       '@ckeditor/ckeditor5-utils': 47.6.1
       ckeditor5: 47.6.1
       es-toolkit: 1.39.5
-    transitivePeerDependencies:
-      - supports-color
 
   '@ckeditor/ckeditor5-merge-fields@47.6.1':
     dependencies:
@@ -25677,8 +25680,6 @@ snapshots:
   ckeditor5-collaboration@47.6.1:
     dependencies:
       '@ckeditor/ckeditor5-collaboration-core': 47.6.1
-    transitivePeerDependencies:
-      - supports-color
 
   ckeditor5-premium-features@47.6.1(bufferutil@4.0.9)(ckeditor5@47.6.1)(utf-8-validate@6.0.5):
     dependencies: