Declare that we last used black 19 for the test source.

diff --git a/debian/tests/tox.ini b/debian/tests/tox.ini
index f8787ffd68d21135d8015a27edc4755e58321f4a..04bf7d41c4d999f72ce233caac6e583899b10009 100644 (file)
--- a/debian/tests/tox.ini
+++ b/debian/tests/tox.ini
@@ -13,14 +13,14 @@ files =
 [testenv:black]
 basepython = python3
 deps =
-  black
+  black >= 19b0, < 20b0
 commands =
   python3 -m black --check --line-length 79 {[defs]files}
 
 [testenv:black-reformat]
 basepython = python3
 deps =
-  black
+  black >= 19b0, < 20b0
 commands =
   python3 -m black --line-length 79 {[defs]files}