refactor move tests from old_unittests to kml_tests

tests/kml_test.py

@@ -40,6 +40,17 @@ def test_linarring_placemark(self) -> None:
         assert isinstance(doc.features[0].geometry, geo.LinearRing)
         assert doc.to_string() == doc2.to_string()
 
+    def test_kml(self) -> None:
+        """Kml file without contents."""
+        k = kml.KML(ns="")
+        assert k.features == []
+        assert (
+            k.to_string().strip().replace(" ", "")
+            == '<kmlxmlns="http://www.opengis.net/kml/2.2"/>'
+        )
+        k2 = kml.KML.class_from_string(k.to_string(), ns="")
+        assert k.to_string() == k2.to_string()
+
 
 class TestLxml(Lxml, TestStdLibrary):
     """Test with lxml."""

tests/oldunit_test.py

@@ -59,17 +59,6 @@ def setup_method(self) -> None:
         config.set_etree_implementation(xml.etree.ElementTree)
         config.set_default_namespaces()
 
-    def test_kml(self) -> None:
-        """Kml file without contents."""
-        k = kml.KML(ns="")
-        assert k.features == []
-        assert (
-            str(k.to_string())[:51]
-            == '<kml xmlns="http://www.opengis.net/kml/2.2" />'[:51]
-        )
-        k2 = kml.KML.class_from_string(k.to_string(), ns="")
-        assert k.to_string() == k2.to_string()
-
     def test_folder(self) -> None:
         """KML file with folders."""
         ns = "{http://www.opengis.net/kml/2.2}"