--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tests/mocktime.py	Fri Sep 29 11:41:24 2017 -0700
@@ -0,0 +1,18 @@
+from __future__ import absolute_import
+
+import os
+import time
+
+class mocktime(object):
+    def __init__(self, increment):
+        self.time = 0
+        self.increment = [float(s) for s in increment.split()]
+        self.pos = 0
+
+    def __call__(self):
+        self.time += self.increment[self.pos % len(self.increment)]
+        self.pos += 1
+        return self.time
+
+def uisetup(ui):
+    time.time = mocktime(os.environ.get('MOCKTIME', '0.1'))