windows does not like contextual temp files

.gitignore

@@ -15,6 +15,7 @@ diyepw/data/tmy_epw_files/*
 *.egg-info
 
 # Python cache files
+venv*
 __pycache__
 
 # Files generated by unit testing

docs/requirements.txt

@@ -1,2 +1,3 @@
 xarray~=0.16.2
-numpy~=1.19.2
+numpy~=1.19.2
+pvlib~=0.8.1

tests/test_meteorology.py

@@ -33,16 +33,17 @@ def test_write_epw(self):
         Confirm that an EPW file generated by the Meteorology.write_epw() method is a valid EPW file
         :return:
         """
-        with tempfile.NamedTemporaryFile('w+') as tmp_file:
-            self._meteorology.write_epw(tmp_file.name)
-            with open(tmp_file.name, "r") as m:
-                try:
-                    parsed_epw, col_names = pvlib.iotools.parse_epw(m)
-                except Exception as e:
-                    raise Exception(f"Encountered an error trying to parse the produce of Meteorology.write_epw() as an EPW file: {e}")
-
-                # Make sure that parse_epw() actually succeeded in creating a DataFrame instance
-                self.assertIsInstance(parsed_epw, pd.DataFrame)
+        tmp_file = os.path.join(tempfile.gettempdir(), os.urandom(24).hex())
+        self._meteorology.write_epw(tmp_file)
+        with open(tmp_file, "r") as m:
+            try:
+                parsed_epw, col_names = pvlib.iotools.parse_epw(m)
+            except Exception as e:
+                raise Exception(f"Encountered an error trying to parse the produce of Meteorology.write_epw() as an EPW file: {e}")
+
+            # Make sure that parse_epw() actually succeeded in creating a DataFrame instance
+            self.assertIsInstance(parsed_epw, pd.DataFrame)
+        os.unlink(tmp_file)
 
 
     def test_property_setters_and_getters__good_values(self):