test: add types cheking test for 20-interface-using

Author: karoxa3

modules/35-interfaces/20-interface-using/index.ts

@@ -24,4 +24,4 @@ const superMan: ISuperman = {
 };
 // END
 
-export default superMan;
+export { superMan, ISuperman, IBird, IPlane };

modules/35-interfaces/20-interface-using/test.ts

@@ -1,8 +1,18 @@
-import { expect, test } from 'vitest'
-import superMan from './index';
+import { expect, test, expectTypeOf } from 'vitest'
+import { superMan, ISuperman, IBird, IPlane } from './index';
 
 test('guess who', () => {
   expect(superMan.guessWho('bird')).toBe("It's a bird?");
   expect(superMan.guessWho('plane')).toBe("It's a plane?");
   expect(superMan.guessWho('SupErMan')).toBe("It's a SupErMan!");
 });
+
+test('Types check', () => {
+  expectTypeOf<ISuperman>().toMatchTypeOf<IBird>();
+  expectTypeOf<ISuperman>().toMatchTypeOf<IPlane>();
+  expectTypeOf(superMan).toMatchTypeOf<ISuperman>();
+
+  expect(superMan).toHaveProperty('canFly');
+  expect(superMan).toHaveProperty('isLiving');
+  expect(superMan).toHaveProperty('canCarryPeople');
+});