FIX: Update with statement.

tests/io/test_output_to_geotiff.py

@@ -1,11 +1,9 @@
 """ Unit Tests for Py-ART's output_to_geotiff.py module. """
 
 import warnings
-from pathlib import Path
 
 import numpy as np
 import pytest
-from PIL import Image
 
 import pyart
 
@@ -157,12 +155,10 @@ def test_write_grid_geotiff_missing_field():
 )
 def test_write_grid_geotiff_transparent_background():
     grid = make_tiny_grid_with_mask()
-    with pyart.testing.InTemporaryDirectory() as tmpdir:
-        tmp = Path(tmpdir)
-        outname = tmp / "transparent_bg.tif"
+    with pyart.testing.InTemporaryDirectory():
         pyart.io.write_grid_geotiff(
             grid,
-            str(outname),
+            "transparent.foo",
             "reflectivity",
             rgb=True,
             cmap="pyart_HomeyerRainbow",
@@ -171,22 +167,19 @@ def test_write_grid_geotiff_transparent_background():
             transparent_bg=True,
             opacity=1,
         )
-        imgname = outname.rename(tmp / "transparent_bg.tiff")
-        img = Image.open(imgname)
-        img.show()
+        with open("transparent.foo", "rb") as f:
+            assert len(f.read()) > 0
 
 
 @pytest.mark.skipif(
     not pyart.io.output_to_geotiff.IMPORT_FLAG, reason="GDAL is not installed."
 )
 def test_write_grid_geotiff_opacity():
     grid = make_tiny_grid_with_mask()
-    with pyart.testing.InTemporaryDirectory() as tmpdir:
-        tmp = Path(tmpdir)
-        outname = tmp / "opacity.tif"
+    with pyart.testing.InTemporaryDirectory():
         pyart.io.write_grid_geotiff(
             grid,
-            str(outname),
+            "opacity.foo",
             "reflectivity",
             rgb=True,
             cmap="pyart_HomeyerRainbow",
@@ -195,6 +188,5 @@ def test_write_grid_geotiff_opacity():
             transparent_bg=False,
             opacity=0.25,
         )
-        imgname = outname.rename(tmp / "opacity.tiff")
-        img = Image.open(imgname)
-        img.show()
+        with open("opacity.foo", "rb") as f:
+            assert len(f.read()) > 0