Add testcase

Author: ota-meshi

tests/lib/rules/require-valid-default-prop.js

@@ -258,10 +258,14 @@ ruleTester.run('require-valid-default-prop', rule, {
       code: `<script setup lang="ts">
       export interface SomePropInterface {
         someProp?: false | string;
+        str?: 'foo' | 'bar';
+        num?: 1 | 2;
       }
 
       withDefaults(defineProps<SomePropInterface>(), {
         someProp: false,
+        str: 'foo',
+        num: 1
       });
       </script>`,
       parserOptions: {