Pass 'encoding' to target.open in test_open_text_FileNotFoundError. Fixes python#280.

Author: jaraco

CHANGES.rst

@@ -1,3 +1,8 @@
+v5.10.4
+=======
+
+* #280: Fixed one more ``EncodingWarning`` in test suite.
+
 v5.10.3
 =======
 

importlib_resources/tests/test_open.py

@@ -56,11 +56,13 @@ def test_open_text_with_errors(self):
 
     def test_open_binary_FileNotFoundError(self):
         target = resources.files(self.data) / 'does-not-exist'
-        self.assertRaises(FileNotFoundError, target.open, 'rb')
+        with self.assertRaises(FileNotFoundError):
+            target.open('rb')
 
     def test_open_text_FileNotFoundError(self):
         target = resources.files(self.data) / 'does-not-exist'
-        self.assertRaises(FileNotFoundError, target.open)
+        with self.assertRaises(FileNotFoundError):
+            target.open(encoding='utf-8')
 
 
 class OpenDiskTests(OpenTests, unittest.TestCase):