add test

tests/automated/getEventSource.js

@@ -0,0 +1,47 @@
+describe('getEventSource', function() {
+	var options;
+	var calendarEl;
+
+	beforeEach(function() {
+		affix('#cal');
+		calendarEl = $('#cal');
+		options = {
+			now: '2015-08-07',
+			defaultView: 'agendaWeek',
+			eventSources: [
+				{
+					events: [
+						{ id: 1, start: '2015-08-07T02:00:00', end: '2015-08-07T03:00:00', title: 'event A' }
+					],
+					id: 'source1'
+				},
+				{
+					events: [
+						{ id: 2, start: '2015-08-07T03:00:00', end: '2015-08-07T04:00:00', title: 'event B' }
+					],
+					id: 'source2'
+				},
+				{
+					events: [
+						{ id: 3, start: '2015-08-07T04:00:00', end: '2015-08-07T05:00:00', title: 'event C' }
+					],
+					id: 'source3'
+				}
+			]
+		};
+	});
+
+	it('does not mutate when removeEventSource is called', function(done) {
+		var eventSource;
+
+		calendarEl.fullCalendar(options);
+
+		eventSource = calendarEl.fullCalendar('getEventSource', 'source1');
+		expect(typeof eventSource).toBe('object');
+
+		calendarEl.fullCalendar('removeEventSource', eventSource);
+		expect(typeof eventSource).toBe('object'); // instead of 'undefined'
+
+		done();
+	});
+});