Started user control

static/leafletCluster/spec/suites/onAddSpec.js

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+describe('onAdd', function () {
+	var map, div;
+	beforeEach(function () {
+		div = document.createElement('div');
+		div.style.width = '200px';
+		div.style.height = '200px';
+		document.body.appendChild(div);
+
+		map = L.map(div);
+
+		map.fitBounds(new L.LatLngBounds([
+			[1, 1],
+			[2, 2]
+		]));
+	});
+	afterEach(function () {
+		document.body.removeChild(div);
+	});
+
+
+	it('throws an error if maxZoom is not specified', function () {
+
+		var group = new L.MarkerClusterGroup();
+		var marker = new L.Marker([1.5, 1.5]);
+
+		group.addLayer(marker);
+
+		var ex = null;
+		try {
+			map.addLayer(group);
+		} catch (e) {
+			ex = e;
+		}
+
+		expect(ex).to.not.be(null);
+	});
+
+	it('successfully handles removing and re-adding a layer while not on the map', function () {
+		map.options.maxZoom = 18;
+		var group = new L.MarkerClusterGroup();
+		var marker = new L.Marker([1.5, 1.5]);
+
+		map.addLayer(group);
+		group.addLayer(marker);
+
+		map.removeLayer(group);
+		group.removeLayer(marker);
+		group.addLayer(marker);
+
+		map.addLayer(group);
+
+		expect(map.hasLayer(group)).to.be(true);
+		expect(group.hasLayer(marker)).to.be(true);
+	});
+});