@Test
public void addMapElement() {

	this.group.add(this.point);
	this.group.add(this.multiPoint);
	this.group.add(this.polyline);
	this.group.add(this.polygon);
	this.group.add(this.circle);
	Iterator<? extends MapElement> iterator = this.group.elements.iterator();
	assertTrue(iterator.hasNext());
	assertSame(this.point, iterator.next());
	assertTrue(iterator.hasNext());
	assertSame(this.multiPoint, iterator.next());
	assertTrue(iterator.hasNext());
	assertSame(this.polyline, iterator.next());
	assertTrue(iterator.hasNext());
	assertSame(this.polygon, iterator.next());
	assertTrue(iterator.hasNext());
	assertSame(this.circle, iterator.next());
	assertFalse(iterator.hasNext());
}