Started user control

static/leafletCluster/spec/suites/onRemoveSpec.js

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+describe('onRemove', 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, { maxZoom: 18 });
+
+		map.fitBounds(new L.LatLngBounds([
+			[1, 1],
+			[2, 2]
+		]));
+	});
+	afterEach(function () {
+		document.body.removeChild(div);
+	});
+
+
+	it('removes the shown coverage polygon', 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);
+		group.addLayer(marker3);
+
+		map.addLayer(group);
+
+		group._showCoverage({ layer: group._topClusterLevel });
+
+		expect(group._shownPolygon).to.not.be(null);
+
+		map.removeLayer(group);
+
+		expect(group._shownPolygon).to.be(null);
+	});
+});