leaflet.markercluster/spec/suites/markerMoveSupportSpec.js

Provides Beautiful Animated Marker Clustering functionality for Leaflet

describe('moving markers', function () {
	/////////////////////////////
	// SETUP FOR EACH TEST
	/////////////////////////////
	var div, map, group, 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, { maxZoom: 18, trackResize: false });
	
		// Corresponds to zoom level 8 for the above div dimensions.
		map.fitBounds(new L.LatLngBounds([
			[1, 1],
			[2, 2]
		]));
	});

	afterEach(function () {
		if (group instanceof L.MarkerClusterGroup) {
			group.clearLayers();
			map.removeLayer(group);
		}

		map.remove();
		div.remove();
		clock.restore();

		div = map = group = clock;
	});


	/////////////////////////////
	// TESTS
	/////////////////////////////
	it('moves a marker that was moved while off the map', function () {

		group = new L.MarkerClusterGroup();

		var marker = new L.Marker([10, 10]);
		map.addLayer(group);
		group.addLayer(marker);

		map.removeLayer(group);
		marker.setLatLng([1.5, 1.5]);
		map.addLayer(group);

		expect(group.getLayers().length).to.be(1);
	});

	it('moves multiple markers that were moved while off the map', function () {

		group = new L.MarkerClusterGroup();
		map.addLayer(group);

		var markers = [];
		for (var i = 0; i < 10; i++) {
			var marker = new L.Marker([10, 10]);
			group.addLayer(marker);
			markers.push(marker);
		}

		map.removeLayer(group);
		for (var i = 0; i < 10; i++) {
			var marker = markers[i];
			marker.setLatLng([1.5, 1.5]);
		}
		map.addLayer(group);

		expect(group.getLayers().length).to.be(10);
	});
});