Fix for issue #572

stix2/base.py

@@ -103,7 +103,9 @@ def _check_properties_dependency(self, list_of_properties, list_of_dependent_pro
         failed_dependency_pairs = []
         for p in list_of_properties:
             for dp in list_of_dependent_properties:
-                if not self.get(p) and self.get(dp):
+                if p not in self and dp in self:
+                    failed_dependency_pairs.append((p, dp))
+                elif p in self and (self[p] is None or self[p] is False) and dp in self and self[dp] is not None:
                     failed_dependency_pairs.append((p, dp))
         if failed_dependency_pairs:
             raise DependentPropertiesError(self.__class__, failed_dependency_pairs)

stix2/test/v21/test_location.py

@@ -377,3 +377,48 @@ def test_bing_map_url_multiple_props_and_long_lat_provided():
 
     loc_url = loc.to_maps_url("Bing Maps")
     assert loc_url == expected_url
+
+
+def test_bing_map_url_for_0_long_lat():
+    expected_url = "https://bing.com/maps/default.aspx?where1=0.0%2C0.0&lvl=16"
+
+    loc = stix2.v21.Location(
+        region="Gulf of Guinea",
+        country="International waters",
+        street_address="0°N, 0°E – Null Island",
+        latitude=0.0,
+        longitude=0.0,
+    )
+
+    loc_url = loc.to_maps_url("Bing Maps")
+    assert loc_url == expected_url
+
+
+def test_bing_map_url_for_0_long():
+    expected_url = "https://bing.com/maps/default.aspx?where1=0.0%2C39.668&lvl=16"
+
+    loc = stix2.v21.Location(
+        region="Eastern Africa",
+        country="Kenya",
+        street_address="0°N, 39.668°E",
+        latitude=0.0,
+        longitude=39.668,
+    )
+
+    loc_url = loc.to_maps_url("Bing Maps")
+    assert loc_url == expected_url
+
+
+def test_bing_map_url_for_0_lat():
+    expected_url = "https://bing.com/maps/default.aspx?where1=51.477%2C0.0&lvl=16"
+
+    loc = stix2.v21.Location(
+        region="Western Europe",
+        country="United Kingdom",
+        street_address="Royal Observatory, Blackheath Ave, Greenwich, London SE10 8XJ, United Kingdom",
+        latitude=51.477,
+        longitude=0.0,
+    )
+
+    loc_url = loc.to_maps_url("Bing Maps")
+    assert loc_url == expected_url