expand section names (#1545)

* expand section names

* fix linting

* Added changelog

* trim whitespaces around factor names

* added docs

1 files changed, 9 insertions, 0 deletions

diff --git a/tests/unit/config/test_config.py b/tests/unit/config/test_config.py
index 56e849e6..ba21a25b 100644
--- a/tests/unit/config/test_config.py
+++ b/tests/unit/config/test_config.py
@@ -859,6 +859,15 @@ class TestIniParser:
         (msg,) = excinfo.value.args
         assert msg == "key5: boolean value 'yes' needs to be 'True' or 'False'"
 
+    def test_expand_section_name(self, newconfig):
+        config = newconfig(
+            """
+            [testenv:custom-{one,two,three}-{four,five}-six]
+        """
+        )
+        assert "testenv:custom-one-five-six" in config._cfg.sections
+        assert "testenv:custom-{one,two,three}-{four,five}-six" not in config._cfg.sections
+
 
 class TestIniParserPrefix:
     def test_basic_section_access(self, newconfig):