diff --git a/npm/ng-packs/packages/core/src/lib/tests/validators.spec.ts b/npm/ng-packs/packages/core/src/lib/tests/validators.spec.ts
index 6bc33dbfda..695625b740 100644
--- a/npm/ng-packs/packages/core/src/lib/tests/validators.spec.ts
+++ b/npm/ng-packs/packages/core/src/lib/tests/validators.spec.ts
@@ -5,6 +5,7 @@ import { validateCreditCard } from '../validators/credit-card.validator';
 import { validateRequired } from '../validators/required.validator';
 import { validateStringLength } from '../validators/string-length.validator';
 import { validateUrl } from '../validators/url.validator';
+import { validateUniqueCharacter } from '../validators';
 
 const emailAddress = () => Validators.email;
 
@@ -181,4 +182,25 @@ describe('Validators', () => {
       expect(control.errors).toEqual(expected);
     });
   });
+
+  describe('Unique Character Validator', () => {
+    const error = { uniqueCharacter: true };
+
+    test.each`
+      input            | expected
+      ${undefined}     | ${null}
+      ${null}          | ${null}
+      ${''}            | ${null}
+      ${'password'}    | ${error}
+      ${'123456789'}   | ${null}
+      ${'1q2w3E*'}     | ${null}
+      ${'password123'} | ${error}
+    `('should return $expected when input is $input', ({ input, expected }) => {
+      const control = new FormControl(input, [validateUniqueCharacter()]);
+      control.markAsDirty({ onlySelf: true });
+      control.updateValueAndValidity({ onlySelf: true, emitEvent: false });
+
+      expect(control.errors).toEqual(expected);
+    });
+  });
 });