parametrized sets -> ordered list so we can run with xdist

Author: fselmo

tests/core/test_mnemonic.py

@@ -89,7 +89,7 @@ def test_expand_word():
 
 @pytest.mark.parametrize(
     "lang",
-    {
+    [
         Language(lang)
         for lang in Mnemonic.list_languages()
         if lang
@@ -100,7 +100,7 @@ def test_expand_word():
             "chinese_simplified",
             "chinese_traditional",
         )
-    },
+    ],
 )
 def test_expand(lang):
     m = Mnemonic(lang)

tox.ini

@@ -18,7 +18,7 @@ max_issue_threshold=1
 
 [testenv]
 commands=
-    core: coverage run -m pytest {posargs:tests/core}
+    core: coverage run -m pytest -n auto --maxprocesses=4 {posargs:tests/core}
     core: coverage report
     integration: pytest {posargs:tests/integration}
     docs: make check-docs-ci