Correct epw test file.  fixes
@@ -13,7 +13,7 @@ to run unit tests, run pytest from the command line in the bifacial_radiance dir
import bifacial_radiance.readepw as readepw
# test the readepw on a dummy Boulder EPW file in the /tests/ directory
-TESTDATA_FILENAME = 'USA_CO_Boulder.724699_TMY2.epw'
+TESTDATA_FILENAME = r'tests\USA_CO_Boulder.724699_TMY2.epw'
def test_readepw_metadata():
# Is this returning correct metadata?
