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static/leafletCluster/spec/suites/disableClusteringAtZoomSpec.js

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+describe('disableClusteringAtZoom option', 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);
+		}
+
+		// group must be thrown away since we are testing it with a potentially
+		// different configuration at each test.
+		group = null;
+
+		clock.restore();
+		clock = null;
+
+	});
+
+
+	/////////////////////////////
+	// 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('unclusters at zoom level equal or higher', function () {
+
+		var maxZoom = 15;
+
+		group = new L.MarkerClusterGroup({
+			disableClusteringAtZoom: maxZoom
+		});
+
+		group.addLayers([
+			new L.Marker([1.5, 1.5]),
+			new L.Marker([1.5, 1.5])
+		]);
+		map.addLayer(group);
+
+		expect(group._maxZoom).to.equal(maxZoom - 1);
+
+		expect(map._panes.markerPane.childNodes.length).to.equal(1); // 1 cluster.
+
+		map.setZoom(14);
+		clock.tick(1000);
+		expect(map._panes.markerPane.childNodes.length).to.equal(1); // 1 cluster.
+
+		map.setZoom(15);
+		clock.tick(1000);
+		expect(map._panes.markerPane.childNodes.length).to.equal(2); // 2 markers.
+	});
+
+
+	/////////////////////////////
+	// CLEAN UP CODE
+	/////////////////////////////
+
+	map.remove();
+	document.body.removeChild(div);
+
+});