Add regression test for strictIndexSignatures with patternProperties

Signed-off-by: Yoriyasu Yano <[email protected]>

Author: yorinasub17

test/__snapshots__/test/test.ts.md

@@ -2230,6 +2230,14 @@ Generated by [AVA](https://avajs.dev).
         maybe?: string;␊
         [k: string]: Leaf | undefined;␊
       };␊
+      pattern?: {␊
+        maybe?: string;␊
+        /**␊
+         * This interface was referenced by \`undefined\`'s JSON-Schema definition␊
+         * via the \`patternProperty\` "leaf|tree".␊
+         */␊
+        [k: string]: unknown[] | undefined;␊
+      };␊
       [k: string]: string | undefined;␊
     }␊
     export interface Leaf {␊

test/__snapshots__/test/test.ts.snap

@@ -22,6 +22,19 @@ export const input = {
         },
       },
     },
+    pattern: {
+      type: 'object',
+      properties: {
+        maybe: {
+          type: 'string',
+        },
+      },
+      patternProperties: {
+        'leaf|tree': {
+          type: 'array',
+        },
+      },
+    },
   },
   additionalProperties: {
     type: 'string',