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static/leafletCluster/spec/suites/removeLayersSpec.js

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+describe('removeLayers', function () {
+
+	/**
+	 * Avoid as much as possible creating and destroying objects for each test.
+	 * Instead, try re-using them, except for the ones under test of course.
+	 * PhantomJS does not perform garbage collection for the life of the page,
+	 * i.e. during the entire test process (Karma runs all tests in a single page).
+	 * http://stackoverflow.com/questions/27239708/how-to-get-around-memory-error-with-karma-phantomjs
+	 *
+	 * The `beforeEach` and `afterEach do not seem to cause much issue.
+	 * => they can still be used to initialize some setup between each test.
+	 * Using them keeps a readable spec/index.
+	 *
+	 * But refrain from re-creating div and map every time. Re-use those objects.
+	 */
+
+	/////////////////////////////
+	// SETUP FOR EACH TEST
+	/////////////////////////////
+
+	beforeEach(function () {
+
+		clock = sinon.useFakeTimers();
+
+	});
+
+	afterEach(function () {
+
+		if (group instanceof L.MarkerClusterGroup) {
+			group.clearLayers();
+			map.removeLayer(group);
+		}
+
+		// Throw away group as it can be assigned with different configurations between tests.
+		group = null;
+
+		clock.restore();
+
+	});
+
+
+	/////////////////////////////
+	// PREPARATION CODE
+	/////////////////////////////
+
+	var div, map, group, clock;
+
+	div = document.createElement('div');
+	div.style.width = '200px';
+	div.style.height = '200px';
+	document.body.appendChild(div);
+
+	map = L.map(div, { maxZoom: 18 });
+
+	// Corresponds to zoom level 8 for the above div dimensions.
+	map.fitBounds(new L.LatLngBounds([
+		[1, 1],
+		[2, 2]
+	]));
+
+
+	/////////////////////////////
+	// TESTS
+	/////////////////////////////
+
+	it('removes all the layer given to it', function () {
+
+		group = new L.MarkerClusterGroup();
+
+		var markers = [
+			new L.Marker([1.5, 1.5]),
+			new L.Marker([1.5, 1.5]),
+			new L.Marker([1.5, 1.5])
+		];
+
+		map.addLayer(group);
+
+		group.addLayers(markers);
+
+		group.removeLayers(markers);
+
+		expect(group.hasLayer(markers[0])).to.be(false);
+		expect(group.hasLayer(markers[1])).to.be(false);
+		expect(group.hasLayer(markers[2])).to.be(false);
+
+		expect(group.getLayers().length).to.be(0);
+	});
+
+	it('removes all the layer given to it even though they move', function () {
+
+		group = new L.MarkerClusterGroup();
+
+		var markers = [
+			new L.Marker([10, 10]),
+			new L.Marker([20, 20]),
+			new L.Marker([30, 30])
+		];
+		var len = markers.length;
+		map.addLayer(group);
+
+		group.addLayers(markers);
+
+		markers.forEach(function (marker) {
+			marker.setLatLng([1.5, 1.5]);
+			group.removeLayer(marker);
+			expect(group.getLayers().length).to.be(len - 1);
+			group.addLayer(marker);
+			expect(group.getLayers().length).to.be(len);
+		});
+
+		expect(group.getLayers().length).to.be(len);
+	});
+
+	it('removes all the layer given to it even if the group is not on the map', function () {
+
+		group = new L.MarkerClusterGroup();
+
+		var markers = [
+			new L.Marker([1.5, 1.5]),
+			new L.Marker([1.5, 1.5]),
+			new L.Marker([1.5, 1.5])
+		];
+
+		map.addLayer(group);
+		group.addLayers(markers);
+		map.removeLayer(group);
+		group.removeLayers(markers);
+		map.addLayer(group);
+
+		expect(group.hasLayer(markers[0])).to.be(false);
+		expect(group.hasLayer(markers[1])).to.be(false);
+		expect(group.hasLayer(markers[2])).to.be(false);
+
+		expect(group.getLayers().length).to.be(0);
+	});
+
+	it('doesnt break if we are spiderfied', function () {
+
+		group = new L.MarkerClusterGroup();
+
+		var markers = [
+			new L.Marker([1.5, 1.5]),
+			new L.Marker([1.5, 1.5]),
+			new L.Marker([1.5, 1.5])
+		];
+
+		map.addLayer(group);
+
+		group.addLayers(markers);
+
+		markers[0].__parent.spiderfy();
+
+		// We must wait for the spiderfy animation to timeout
+		clock.tick(200);
+
+		group.removeLayers(markers);
+
+		expect(group.hasLayer(markers[0])).to.be(false);
+		expect(group.hasLayer(markers[1])).to.be(false);
+		expect(group.hasLayer(markers[2])).to.be(false);
+
+		expect(group.getLayers().length).to.be(0);
+
+		group.on('spiderfied', function() {
+			expect(group._spiderfied).to.be(null);
+		});
+	});
+
+	it('handles nested Layer Groups', function () {
+
+		group = new L.MarkerClusterGroup();
+
+		var marker1 = 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]);
+
+		map.addLayer(group);
+
+		group.addLayers([marker1, marker2, marker3]);
+
+		expect(group.hasLayer(marker1)).to.be(true);
+		expect(group.hasLayer(marker2)).to.be(true);
+		expect(group.hasLayer(marker3)).to.be(true);
+
+		group.removeLayers([
+			marker1,
+			new L.LayerGroup([
+				marker2, new L.LayerGroup([
+					marker3
+				])
+			])
+		]);
+
+		expect(group.hasLayer(marker1)).to.be(false);
+		expect(group.hasLayer(marker2)).to.be(false);
+		expect(group.hasLayer(marker3)).to.be(false);
+
+		expect(group.getLayers().length).to.be(0);
+	});
+
+
+	/////////////////////////////
+	// CLEAN UP CODE
+	/////////////////////////////
+
+	map.remove();
+	document.body.removeChild(div);
+
+});