RegionChooser: Testing if other elements than Buildings are extracted.

test/eu/simstadt/regionchooser/test/RegionExtractorTests.java

 package eu.simstadt.regionchooser.test;
 
 import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertTrue;
 import java.nio.file.Path;
 import java.nio.file.Paths;
@@ -53,6 +54,8 @@ public void testExtract3BuildingsFromNAD83Model() throws Throwable {
 		assertTrue(archGMLString.contains("uuid_0985cebb-922d-4b3e-95e5-15dc6089cd28"));
 		assertTrue(archGMLString.contains("<CityModel")); // Header
 		assertTrue(archGMLString.contains("</CityModel")); // Footer
+		assertFalse(archGMLString.contains("comment between buildings")); // Comment
+		assertFalse(archGMLString.contains("comment after last building")); // Comment
 	}
 
 	@Test