add test case

Author: Andarist

tests/cases/fourslash/quickInfoMappedPropertyUnionUndefined5.ts

@@ -0,0 +1,23 @@
+// @strict: true
+
+// https://github.com/microsoft/TypeScript/issues/62325
+
+//// type RequiredKeys<T extends object> = {
+////   [K in keyof Required<T>]: T[K];
+//// };
+////
+//// type Foo = {
+////   a?: string;
+////   b?: number;
+////   c: string;
+////   d: boolean | undefined;
+//// };
+////
+//// type Bar/*1*/ = RequiredKeys<Foo>;
+
+verify.quickInfoAt("1", `type Bar = {
+    a: string | undefined;
+    b: number | undefined;
+    c: string;
+    d: boolean | undefined;
+}`);