test(icalendar): Add reproduction test for UNTIL object mismatch

icalendar_test.ts

@@ -206,3 +206,35 @@ Deno.test("expandRecurrences - object rrule (Reproduction of missing events)", (
   assert(!warningLogged, "Should NOT have logged a warning for object rrule");
 });
 
+
+Deno.test("expandRecurrences - object rrule with until (Reproduction)", () => {
+  const now = new Date();
+  const start = new Date(now.getTime() - 10 * 86400000); 
+  const startStr = localDateString(start);
+  const untilDate = new Date(now.getTime() + 10 * 86400000);
+
+  const icsEvent = {
+    summary: "Object RRULE UNTIL Event",
+    start: startStr,
+    rrule: { frequency: "DAILY", until: { date: untilDate } } // Common ts-ics structure
+  };
+  
+  // Spy on console.error
+  let errorLogged = false;
+  const originalConsoleError = console.error;
+  console.error = (...args) => {
+    if (args[0].includes("Error expanding recurrence for Object RRULE UNTIL Event") && 
+        args[1].message.includes("Invalid UNTIL value")) {
+      errorLogged = true;
+    }
+  };
+
+  try {
+    expandRecurrences(icsEvent, 30);
+  } finally {
+    console.error = originalConsoleError;
+  }
+
+  assert(errorLogged, "Should have logged an error for invalid UNTIL object value");
+});
+