test(icalendar): Add validation and object rrule reproduction tests

icalendar_test.ts

@@ -154,3 +154,55 @@ Deno.test("expandRecurrences - non-string rrule (Reproduction)", () => {
   assert(warningLogged, "Should have logged a warning for non-string rrule");
 });
 
+
+Deno.test("expandRecurrences - validation of visibility logic", () => {
+  const now = new Date();
+  const start = new Date(now.getTime() - 100 * 86400000); // Started 100 days ago
+  const startStr = localDateString(start);
+
+  const icsEvent = {
+    summary: "Validation Weekly Meeting",
+    start: startStr,
+    rrule: "FREQ=WEEKLY;BYDAY=" + ["SU","MO","TU","WE","TH","FR","SA"][start.getDay()]
+  };
+  
+  const results = expandRecurrences(icsEvent, 30);
+  // Should produce occurrences for the last 7 days + next 30 days.
+  // Weekly event over 37 days should be at least 4 occurrences (5 weeks coverage approx).
+  assert(results.length >= 4, `Expected at least 4 occurrences, got ${results.length}`);
+  assertEquals(results[0].recurrent, true);
+});
+
+
+Deno.test("expandRecurrences - object rrule (Reproduction of missing events)", () => {
+  const now = new Date();
+  const start = new Date(now.getTime() - 100 * 86400000); 
+  const startStr = localDateString(start);
+
+  const icsEvent = {
+    summary: "Object RRULE Event",
+    start: startStr,
+    rrule: { freq: "WEEKLY", byday: "MO" } // Simulating object rrule
+  };
+  
+  // Spy on console.warn
+  let warningLogged = false;
+  const originalConsoleWarn = console.warn;
+  console.warn = (...args) => {
+    if (args[0].includes("Invalid rrule type (object)")) {
+      warningLogged = true;
+    }
+  };
+
+  try {
+    const results = expandRecurrences(icsEvent, 30);
+    // Currently, it returns [icsEvent] (length 1) and logs a warning.
+    // This confirms that it is NOT expanding it.
+    assertEquals(results.length, 1);
+  } finally {
+    console.warn = originalConsoleWarn;
+  }
+  
+  assert(warningLogged, "Should have logged a warning for object rrule");
+});
+