Started user control

static/leafletCluster/spec/suites/nonIntegerZoomSpec.js

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+describe('non-integer min/max zoom', function () {
+	var map, div, clock;
+	beforeEach(function () {
+		clock = sinon.useFakeTimers();
+
+		div = document.createElement('div');
+		div.style.width = '200px';
+		div.style.height = '200px';
+		document.body.appendChild(div);
+
+		map = L.map(div, { minZoom: 0.5, maxZoom: 18.5 });
+
+		map.fitBounds(new L.LatLngBounds([
+			[1, 1],
+			[2, 2]
+		]));
+	});
+	afterEach(function () {
+		clock.restore();
+		document.body.removeChild(div);
+	});
+
+	it('dont break adding and removing markers', function () {
+
+		var group = new L.MarkerClusterGroup();
+		var marker = new L.Marker([1.5, 1.5]);
+		var marker2 = new L.Marker([1.5, 1.5]);
+		var marker3 = new L.Marker([1.5, 1.5]);
+
+		group.addLayer(marker);
+		group.addLayer(marker2);
+		map.addLayer(group);
+
+		group.addLayer(marker3);
+
+		expect(marker._icon).to.be(undefined);
+		expect(marker2._icon).to.be(undefined);
+		expect(marker3._icon).to.be(undefined);
+
+		expect(map._panes.markerPane.childNodes.length).to.be(1);
+
+        group.removeLayer(marker2);
+	});
+});