diff --git a/.github/workflows/python-package.yml b/.github/workflows/python-package.yml
index 7bf1f9f..914fda2 100644
--- a/.github/workflows/python-package.yml
+++ b/.github/workflows/python-package.yml
@@ -37,6 +37,13 @@ jobs:
           flake8 . --count --exit-zero --max-complexity=15 --max-line-length=127 --statistics
       - name: Test with unittest
         run: |
+          export PYTHONPATH=
+          export PYTHONPATH=$PYTHONPATH:geodataflow/api/
+          export PYTHONPATH=$PYTHONPATH:geodataflow/core/
+          export PYTHONPATH=$PYTHONPATH:geodataflow/spatial/
+          export PYTHONPATH=$PYTHONPATH:geodataflow/dataframes/
+          export PYTHONPATH=$PYTHONPATH:geodataflow/spark/
+          export PYTHONPATH=$PYTHONPATH:geodataflow/sql/
           python -m unittest geodataflow/core/tests/test_*.py
           python -m unittest geodataflow/spatial/tests/test_*.py
           python -m unittest geodataflow/dataframes/tests/test_*.py
diff --git a/geodataflow/core/geodataflow/core/processing.py b/geodataflow/core/geodataflow/core/processing.py
index 5520a7e..179b6c0 100644
--- a/geodataflow/core/geodataflow/core/processing.py
+++ b/geodataflow/core/geodataflow/core/processing.py
@@ -306,4 +306,3 @@ def unpack(self, data_store) -> Iterable[object]:
             yield row
 
         pass
-
diff --git a/geodataflow/core/geodataflow/core/settingsmanager.py b/geodataflow/core/geodataflow/core/settingsmanager.py
index 25a3142..68a6235 100644
--- a/geodataflow/core/geodataflow/core/settingsmanager.py
+++ b/geodataflow/core/geodataflow/core/settingsmanager.py
@@ -70,4 +70,4 @@ def load_from_dict(self, settings_dict: Dict) -> "SettingsManager":
 """
 Singleton for Application Configuration.
 """
-ApplicationSettings: SettingsManager = SettingsManager()
+ApplicationSettings = SettingsManager()
diff --git a/geodataflow/dataframes/tests/data/test_feature_buffer.json b/geodataflow/dataframes/tests/data/test_feature_buffer.json
index 1c44664..a00641c 100644
--- a/geodataflow/dataframes/tests/data/test_feature_buffer.json
+++ b/geodataflow/dataframes/tests/data/test_feature_buffer.json
@@ -23,10 +23,20 @@
         }
     },
     # Buffer of Geometries of input Features.
+    {
+      "type": "GeometryTransform",
+      "sourceCrs": 4326,
+      "targetCrs": 25830
+    },
     {
       "type": "GeometryBuffer",
       "distance": 0.01
     },
+    {
+      "type": "GeometryTransform",
+      "sourceCrs": 25830,
+      "targetCrs": 4326
+    },
     # Save Features to GeoPackage.
     {
       "type": "FeatureWriter",
diff --git a/geodataflow/dataframes/tests/data/test_feature_centroid.json b/geodataflow/dataframes/tests/data/test_feature_centroid.json
index c09f323..d30bd61 100644
--- a/geodataflow/dataframes/tests/data/test_feature_centroid.json
+++ b/geodataflow/dataframes/tests/data/test_feature_centroid.json
@@ -23,9 +23,19 @@
         }
     },
     # Centroid of Geometries of input Features.
+    {
+      "type": "GeometryTransform",
+      "sourceCrs": 4326,
+      "targetCrs": 25830
+    },
     {
       "type": "GeometryCentroid"
     },
+    {
+      "type": "GeometryTransform",
+      "sourceCrs": 25830,
+      "targetCrs": 4326
+    },
     # Save Features to GeoPackage.
     {
       "type": "FeatureWriter",
diff --git a/geodataflow/dataframes/tests/test_geopandas.py b/geodataflow/dataframes/tests/test_geopandas.py
index 5722867..be44707 100644
--- a/geodataflow/dataframes/tests/test_geopandas.py
+++ b/geodataflow/dataframes/tests/test_geopandas.py
@@ -185,8 +185,8 @@ def test_func(features):
             feature = features[0]
             self.assertEqual(feature.type, 'Feature')
             self.assertEqual(feature.geometry.geom_type, 'Point')
-            self.assertAlmostEqual(feature.geometry.x, -1.6527555, places=6)
-            self.assertAlmostEqual(feature.geometry.y, 42.8170465, places=6)
+            self.assertAlmostEqual(feature.geometry.x, -1.652754, places=6)
+            self.assertAlmostEqual(feature.geometry.y, 42.817075, places=6)
 
         self.process_pipeline(test_func, pipeline_file)
         pass
@@ -240,7 +240,7 @@ def test_func(features):
             feature = features[0]
             self.assertEqual(feature.type, 'Feature')
             self.assertEqual(feature.geometry.geom_type, 'Polygon')
-            self.assertAlmostEqual(feature.geometry.area, 0.0223177, places=6)
+            self.assertAlmostEqual(feature.geometry.area, 0.016489, places=6)
 
         self.process_pipeline(test_func, pipeline_file)
         pass
diff --git a/geodataflow/spatial/geodataflow/spatial/modules/FeatureWriter.py b/geodataflow/spatial/geodataflow/spatial/modules/FeatureWriter.py
index b4c4585..61c2927 100644
--- a/geodataflow/spatial/geodataflow/spatial/modules/FeatureWriter.py
+++ b/geodataflow/spatial/geodataflow/spatial/modules/FeatureWriter.py
@@ -67,7 +67,7 @@ def params(self) -> Dict:
         return {
             'connectionString': {
                 'description':
-                    "Connection string of the FeatureStore ('.csv', '.fgb', '.geojson', '.gpkg' and '.shp.zip' are supported).",
+                    "Connection string of FeatureStore ('.csv', '.fgb', '.geojson', '.gpkg' and '.shp.zip' are supported).",
                 'dataType': 'string',
                 'default': 'output.gpkg',
                 'extensions': ['.csv', '.fgb', '.geojson', '.gpkg', '.shp.zip']