Allow tuples for multiple relative markers

- use tuple instead of list internally
- add comment about forthcoming breaking change
- see #24

Author: mrbean-bremen

CHANGELOG.md

@@ -2,9 +2,12 @@
 
 ## Unreleased
 
-_Note_:
+_Breaking changes in next major version_:
 Support for Python 2.7 and Python 3.5 will be removed with the release of
 version 1.0.0, which is planned for the near future.
+With that version the notation of relative markers in other modules is also 
+planned to change - instead of using the dot notation, the standard pytest
+nodeid will be used. 
 
 ### New features
 - added support for more than one relative marker for the same test

docs/source/index.rst

@@ -461,7 +461,7 @@ Several relationships for the same marker
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 If you need to order a certain test relative to more than one other test, you
 can add more than one test name to the ``before`` or ``after`` marker
-attributes by using a list of test names:
+attributes by using a list or tuple of test names:
 
 .. code:: python
 

pytest_order/sorter.py

@@ -241,18 +241,18 @@ def is_mark_for_class():
 
     def handle_relative_marks(self, item, mark):
         has_relative_marks = False
-        before_marks = mark.kwargs.get("before", [])
-        if before_marks and not isinstance(before_marks, list):
-            before_marks = [before_marks]
+        before_marks = mark.kwargs.get("before", ())
+        if before_marks and not isinstance(before_marks, (list, tuple)):
+            before_marks = (before_marks,)
         for before_mark in before_marks:
             if self.handle_before_or_after_mark(
                     item, mark, before_mark, is_after=False):
                 has_relative_marks = True
             else:
                 self.warn_about_unknown_test(before_mark)
-        after_marks = mark.kwargs.get("after", [])
-        if after_marks and not isinstance(after_marks, list):
-            after_marks = [after_marks]
+        after_marks = mark.kwargs.get("after", ())
+        if after_marks and not isinstance(after_marks, (list, tuple)):
+            after_marks = (after_marks,)
         for after_mark in after_marks:
             if self.handle_before_or_after_mark(
                     item, mark, after_mark, is_after=True):