tests/hghave.py

--- a/tests/hghave.py	Sat Jun 10 14:07:30 2017 -0700
+++ b/tests/hghave.py	Sat Jun 10 14:07:31 2017 -0700
@@ -643,3 +643,7 @@
         return True
     except ImportError:
         return False
+
+@check("fsmonitor", "running tests with fsmonitor")
+def has_fsmonitor():
+    return 'HGFSMONITOR_TESTS' in os.environ