fix #3267, CORRECTLY, add testcase, add testcase for #3279 (#3681)

fixes #3267 AGAIN, correctly, add testcase
add testcase for #3679 , broadcast clipping incorrectly

I added a test module (tests/testNotification) to catch the notification
and check the count. (one way to configure)
i put this module in the tests folder, and added /tests to the server
paths.
(can't have a module in a nested folder, like tests/modules/xxx)

but I have a problem. i can run the test config (MM_CONFIG_FILE), and
the two modules work correctly,
but in the spec runner, the calendar module times out on the broadcast
test.. there is only local ics file access, no outside hosts

I forced my system date to 1/1/24 (same as runner) and again the manual
testcase works fine

I added two test config.js,(configs/calendar) one works great (symbols)
, one fails (broadcast test)
I added additional delay in the calendarspec runner to try to debug the
module, but it still not long enough.. no messages of trouble when I get
into the browser.. BUT, this may be because of the log being turned
off... (just thought of this)

I created a special ICS (in mocks) that has 12 events, 1 for each
month.. (so I can check clipping and broadcast) the US holidays one is
sensitive to the current date, and I couldn't get it to work on
1/1/2024..

also, in general, is there a mechanism to run test:just_one_runner?
waiting thru the electron test to get to one testcase.. ugh..

tests/configs/modules/calendar/symboltest.js

@@ -0,0 +1,28 @@
+
+let config = {
+	address: "0.0.0.0",
+	ipWhitelist: [],
+	timeFormat: 12,
+
+	modules: [
+		{
+			module: "calendar",
+			position: "bottom_bar",
+			config: {
+				maximumEntries: 1,
+				calendars: [
+					{
+						fetchInterval: 7 * 24 * 60 * 60 * 1000,
+						symbol: ["calendar-check", "google"],
+						url: "https://ics.calendarlabs.com/76/mm3137/US_Holidays.ics"
+					}
+				]
+			}
+		}
+	]
+};
+
+/*************** DO NOT EDIT THE LINE BELOW ***************/
+if (typeof module !== "undefined") {
+	module.exports = config;
+}