add initial test

src/hydamo/hydamo/datamodel.py

@@ -433,7 +433,7 @@ def to_geopackage(self, file_path, use_schema=True):
         None.
 
         """
-
+        file_path = Path(file_path)
         for layer in self.layers:
             gdf = getattr(self, layer).copy()
             if not gdf.empty:
@@ -464,8 +464,8 @@ def to_geopackage(self, file_path, use_schema=True):
                     if gdf.index.name in gdf.columns:
                         gdf = gdf.reset_index(drop=True).copy()
                     gdf.to_file(file_path, layer=layer, driver="GPKG")
-
-        add_styles_to_geopackage(file_path)
+        if file_path.is_file():
+            add_styles_to_geopackage(file_path)
 
     @classmethod
     def from_geopackage(cls, file_path, check_columns=True, check_geotype=True):

src/hydamo/tests/test_datamodel.py

@@ -0,0 +1,17 @@
+from pathlib import Path
+
+import hydamo
+
+
+def test_initialize():
+    damo = hydamo.HyDAMO()
+    assert damo.version == "2.2"
+    assert "stuw" in damo.layers
+    assert isinstance(damo.stuw, hydamo.ExtendedGeoDataFrame)
+    assert "kruinbreedte" in damo.stuw.columns
+    # no data is loaded
+    assert len(damo.stuw) == 0
+    # no file is written
+    path = Path("hydamo.gpkg")
+    damo.to_geopackage(path)
+    assert not path.is_file()