FIX: Wrong syntax in tests.

tests/test_error_stuff.py

@@ -353,14 +353,14 @@ def test_URI_too_long():
     uri_long = 819
     header_long = 815
 
-    with pytest.raises(db.TransactionError) as err:
+    with pytest.raises(db.TransactionError) as excinfo:
         db.execute_query("0123456789" * short)
-    assert "Parsing" in err.msg
+    assert "Parsing" in excinfo.value.msg
 
-    with pytest.raises(db.HTTPURITooLongError) as err:
+    with pytest.raises(db.HTTPURITooLongError) as excinfo:
         db.execute_query("0123456789" * uri_long)
-    assert "414" in err.msg
+    assert "414" in excinfo.value.msg
 
-    with pytest.raises(db.HTTPURITooLongError) as err:
+    with pytest.raises(db.HTTPURITooLongError) as excinfo:
         db.execute_query("0123456789" * header_long)
-    assert "431" in err.msg
+    assert "431" in excinfo.value.msg