diff --git a/tests/hghave.py b/tests/hghave.py
--- a/tests/hghave.py
+++ b/tests/hghave.py
@@ -822,3 +822,7 @@
     except (ImportError, AttributeError):
         pass
     return False
+
+@check('emacs', 'GNU Emacs')
+def has_emacs():
+    return matchoutput('emacs --version', b'GNU Emacs')