Test error when getting band_names. #987

tests/data/geometries/small_polygon.geojson

@@ -0,0 +1,21 @@
+{
+  "type": "FeatureCollection",
+  "features": [
+    {
+      "type": "Feature",
+      "properties": {},
+      "geometry": {
+        "type": "Polygon",
+        "coordinates": [
+          [
+            [0.0, 0.0],
+            [0.0001, 0.0],
+            [0.0001, 1.0],
+            [0.0, 1.0],
+            [0.0, 0.0]
+          ]
+        ]
+      }
+    }
+  ]
+}

tests/datacube_fixtures.py

@@ -5,6 +5,7 @@
 import pytest
 import pytz
 
+from openeogeotrellis.geopysparkdatacube import GeopysparkDataCube
 from openeogeotrellis.service_registry import InMemoryServiceRegistry
 
 TILE_SIZE = 16  # multiple of 16 as this is used for the GeoTIFF tile size as well and mandated by its spec
@@ -133,7 +134,7 @@ def layer_with_two_bands_and_one_date():
 
 
 @pytest.fixture
-def imagecollection_with_two_bands_and_one_date(request):
+def imagecollection_with_two_bands_and_one_date(request) -> GeopysparkDataCube:
     import geopyspark as gps
     from openeogeotrellis.geopysparkdatacube import GeopysparkDataCube, GeopysparkCubeMetadata
     geopyspark_layer = layer_with_two_bands_and_one_date()

tests/test_timeseries.py

@@ -1,5 +1,6 @@
 import datetime
 import json
+from pathlib import Path
 from tempfile import NamedTemporaryFile
 from unittest import TestCase
 
@@ -242,6 +243,19 @@ def test_aggregate_spatial_last_polygon_empty(get_regions, imagecollection_with_
     }
 
 
+def test_aggregate_spatial_small_polygon(imagecollection_with_two_bands_and_one_date):
+    regions = DriverVectorCube.from_fiona([str(get_test_data_file("geometries/small_polygon.geojson"))], None, {})
+
+    result = imagecollection_with_two_bands_and_one_date.aggregate_spatial(
+        regions, {"mean1": {"process_id": "mean", "arguments": {"data": {"from_parameter": "data"}}, "result": True}}
+    )
+    assert isinstance(result, AggregatePolygonResultCSV)
+
+    spatial_result = AggregatePolygonResult(result.get_data(), regions=regions)
+    filename = spatial_result.to_geoparquet()
+    assert Path(filename).exists()
+
+
 def test_zonal_statistics_median_datacube(imagecollection_with_two_bands_and_three_dates):
 
     polygon = Polygon(shell=[