Don't mangle newlines when opening test fixtures; we want them untouched.

tests/utils/data.py

@@ -52,7 +52,7 @@ def data(filename):
 
 
 def get_data(filename):
-    with open(data(filename), encoding="utf-8") as f:
+    with open(data(filename), newline="", encoding="utf-8") as f:
         return f.read()