Fix unit tests

src/lib/date-time-format/tests/format-to-parts.spec.ts

@@ -14,6 +14,7 @@
  */
 
 import { describe, it, expect } from 'vitest';
+import { Intl } from 'temporal-polyfill';
 
 import { formatDateTimeToParts } from '..';
 

src/lib/date-time-format/tests/format.spec.ts

@@ -14,6 +14,7 @@
  */
 
 import { describe, it, expect } from 'vitest';
+import { Intl } from 'temporal-polyfill';
 
 import { formatDateTime, formatDate, formatTime } from '..';
 

src/lib/date-time-format/tests/resolve-format.spec.ts

@@ -14,6 +14,7 @@
  */
 
 import { describe, it, expect } from 'vitest';
+import { Intl } from 'temporal-polyfill';
 
 import { resolveDateTimeFormat } from '..';
 

src/lib/date-time-format/tests/unsupported-styles.spec.ts

@@ -14,6 +14,7 @@
  */
 
 import { vi, describe, it, expect } from 'vitest';
+import { Intl } from 'temporal-polyfill';
 
 import { formatDateTime } from '..';
 

vitest.setup.js

@@ -1,10 +1,11 @@
 import { vi, expect } from 'vitest';
 import * as matchers from 'jest-extended';
+import { Intl as IntlWithTemporal } from 'temporal-polyfill';
 
 expect.extend(matchers);
 
 vi.spyOn(Intl, 'NumberFormat');
-vi.spyOn(Intl, 'DateTimeFormat');
+vi.spyOn(IntlWithTemporal, 'DateTimeFormat');
 
 // Apparently, Node.js doesn't implement these APIs.
 // The mocked return value is based on the test value `1001001001.11111`