Fix test test_curly_braces_in_setenv

The internal state of SetenvDict depends on
curly brackets being escaped.

Author: jayvdb

tests/unit/config/test_config.py

@@ -2094,9 +2094,12 @@ def test_curly_braces_in_setenv(self, newconfig):
             [testenv]
             setenv =
                 VAR = \{val\}
+            commands =
+                {env:VAR}
         """
         configs = newconfig([], inisource).envconfigs
-        assert configs["python"].setenv["VAR"] == "{val}"
+        assert configs["python"].setenv["VAR"] == r"\{val\}"
+        assert configs["python"].commands[0] == ["{val}"]
 
     def test_factor_use_not_checked(self, newconfig):
         inisource = """