OZG-4949 Test `subgroup.unknown-field`

alfa-client/libs/tech-shared/src/lib/validation/tech.validation.util.spec.ts

@@ -203,7 +203,7 @@ describe('ValidationUtils', () => {
     describe.each([
       ['', '', 'unknown-field'],
       ['valid-prefix', 'valid-prefix', 'unknown-field'],
-      ['valid-prefix', 'valid-prefix', 'unknown-field'],
+      ['valid-prefix', 'valid-prefix', 'subGroup.unknown-field'],
       ['unknown-prefix', 'valid-prefix', 'unknown-field'],
       ['unknown-prefix', 'valid-prefix', 'baseField1'],
     ])(