add ini option to disable string escape for parametrization

Author: ApaDoctor

_pytest/python.py

@@ -81,6 +81,9 @@ def pytest_addoption(parser):
     parser.addini("python_functions", type="args", default=["test",],
         help="prefixes or glob names for Python test function and "
              "method discovery")
+    parser.addini("disable_test_id_escaping_and_forfeit_all_rights_to_community_support", type="bool",
+                  default=False, help="disable string escape non-ascii"
+                                      " characters, might cause unwanted side effects")
 
     group.addoption("--import-mode", default="prepend",
         choices=["prepend", "append"], dest="importmode",
@@ -909,7 +912,11 @@ def _idval(val, argname, idx, idfn, config=None):
             return hook_id
 
     if isinstance(val, STRING_TYPES):
-        return _escape_strings(val)
+        if config is None:
+            escape_option = False
+        else:
+            escape_option = config.getini("disable_test_id_escaping_and_forfeit_all_rights_to_community_support")
+        return val if escape_option else _escape_strings(val)
     elif isinstance(val, (float, int, bool, NoneType)):
         return str(val)
     elif isinstance(val, REGEX_TYPE):

doc/en/parametrize.rst

@@ -78,6 +78,16 @@ them in turn::
     test_expectation.py:8: AssertionError
     ======= 1 failed, 2 passed in 0.12 seconds ========
 
+
+.. note::
+
+    pytest by default escapes any non-ascii characters used in unicode strings
+    for the parametrization because it has several downsides.
+    If however you would like to use them, use the option disable_test_id_escaping_and_forfeit_all_rights_to_community_support = False
+    to disable this behavior, but keep in mind that this might cause unwanted side effects and
+    even bugs depending on the OS used and plugins currently installed, so use it at your own risk.
+
+
 As designed in this example, only one pair of input/output values fails
 the simple test function.  And as usual with test function arguments,
 you can see the ``input`` and ``output`` values in the traceback.