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static/leafletCluster/spec/suites/supportNegativeZoomSpec.js

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+describe('things behave correctly with negative minZoom', 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 () {
+
+		// Nothing for this test suite.
+
+	});
+
+	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;
+
+	});
+
+
+	/////////////////////////////
+	// PREPARATION CODE
+	/////////////////////////////
+
+	var div, map, group;
+
+	div = document.createElement('div');
+	div.style.width = '200px';
+	div.style.height = '200px';
+	document.body.appendChild(div);
+
+	map = L.map(div, { minZoom: -3, maxZoom: 18 });
+
+	map.setView(L.latLng(0, 0), -3);
+
+
+	/////////////////////////////
+	// TESTS
+	/////////////////////////////
+
+	it('shows a single marker added to the group before the group is added to the map', function () {
+
+		group = new L.MarkerClusterGroup();
+
+		var marker = new L.Marker([1.5, 1.5]);
+
+		group.addLayer(marker);
+		map.addLayer(group);
+
+		expect(marker._icon).to.not.be(undefined);
+		expect(marker._icon.parentNode).to.be(map._panes.markerPane);
+	});
+
+	it('shows a single marker added to the group after the group is added to the map', function () {
+
+		group = new L.MarkerClusterGroup();
+
+		var marker = new L.Marker([1.5, 1.5]);
+
+		map.addLayer(group);
+		group.addLayer(marker);
+
+		expect(marker._icon).to.not.be(undefined);
+		expect(marker._icon.parentNode).to.be(map._panes.markerPane);
+	});
+
+	it('creates a cluster when 2 overlapping markers are added before the group is added to the map', function () {
+
+		group = new L.MarkerClusterGroup();
+		var marker = new L.Marker([1.5, 1.5]);
+		var marker2 = new L.Marker([1.5, 1.5]);
+
+		group.addLayer(marker);
+		group.addLayer(marker2);
+		map.addLayer(group);
+
+		expect(marker._icon).to.be(undefined);
+		expect(marker2._icon).to.be(undefined);
+
+		expect(map._panes.markerPane.childNodes.length).to.be(1);
+	});
+	it('creates a cluster when 2 overlapping markers are added after the group is added to the map', function () {
+
+		group = new L.MarkerClusterGroup();
+		var marker = new L.Marker([1.5, 1.5]);
+		var marker2 = new L.Marker([1.5, 1.5]);
+
+		map.addLayer(group);
+		group.addLayer(marker);
+		group.addLayer(marker2);
+
+		expect(marker._icon).to.be(null); //Null as was added and then removed
+		expect(marker2._icon).to.be(undefined);
+
+		expect(map._panes.markerPane.childNodes.length).to.be(1);
+	});
+
+	/////////////////////////////
+	// CLEAN UP CODE
+	/////////////////////////////
+
+	map.remove();
+	document.body.removeChild(div);
+
+});