diff --git a/src/__tests__/helpers/to-formatters.test.ts b/src/__tests__/helpers/to-formatters.test.ts
index 4ec707b5..ff234a61 100644
--- a/src/__tests__/helpers/to-formatters.test.ts
+++ b/src/__tests__/helpers/to-formatters.test.ts
@@ -1,14 +1,14 @@
-import { expect } from '@open-wc/testing';
+import { describe, expect, it } from 'vitest';
 
 import { toFormatters } from '../../helpers/to-formatters';
 import type { Formatters } from '../../typings';
 
 describe(toFormatters.name, () => {
   it('returns formatters', () => {
-    const testLocale = 'en-US';
-    const result = toFormatters(testLocale);
+    const locale = 'en-US';
+    const result = toFormatters(locale);
 
-    expect(result).haveOwnProperty('locale', testLocale);
+    expect(result).toHaveProperty('locale', locale);
 
     const props: (keyof Omit<Formatters, 'locale'>)[] = [
       'dateFormat',
@@ -23,7 +23,7 @@ describe(toFormatters.name, () => {
 
     props.forEach(
       n =>
-        expect(result).haveOwnProperty(n)
+        expect(result).toHaveProperty(n)
     );
   });
 
diff --git a/vite.config.ts b/vite.config.ts
index d55605e8..94f2c1f5 100644
--- a/vite.config.ts
+++ b/vite.config.ts
@@ -34,6 +34,7 @@ export default defineConfig({
       '**/*test*/helpers/to-closest-target.test.ts',
       '**/*test*/helpers/to-date-string.test.ts',
       '**/*test*/helpers/to-day-diff-inclusive.test.ts',
+      '**/*test*/helpers/to-formatters.test.ts',
       // '**/*test*/date-picker-input/**.test.ts',
     ],
     clearMocks: true,