diff --git a/justfile b/justfile
index f3c29b9..73b0649 100644
--- a/justfile
+++ b/justfile
@@ -12,5 +12,8 @@ compile:
 	cask emacs -batch -L . -L test --eval "(setq byte-compile-error-on-warn t)" -f batch-byte-compile $(cask files); (ret=$? ; cask clean-elc && exit $ret)
 
 # Run unit tests matching a pattern (matches all tests by default)
-test pattern=".": compile
-    cask exec buttercup -L . --pattern {{pattern}} --no-skip
+test pattern="." flags="": compile
+    cask exec buttercup -L . --pattern {{pattern}} --no-skip {{flags}}
+
+# Run unit tests matching a pattern with verbose debug info on failure
+testv pattern=".": (test pattern "--traceback full")