diff -r b06303a208be -r 14e500b58263 mercurial/testing/storage.py
--- a/mercurial/testing/storage.py	Wed Sep 26 11:27:41 2018 -0700
+++ b/mercurial/testing/storage.py	Mon Sep 24 11:56:48 2018 -0700
@@ -388,6 +388,10 @@
     def testempty(self):
         f = self._makefilefn()
 
+        self.assertEqual(f.storageinfo(), {})
+        self.assertEqual(f.storageinfo(revisionscount=True, trackedsize=True),
+                         {'revisionscount': 0, 'trackedsize': 0})
+
         self.assertEqual(f.rawsize(nullrev), 0)
 
         for i in range(-5, 5):
@@ -466,6 +470,10 @@
         with self._maketransactionfn() as tr:
             node = f.add(fulltext, None, tr, 0, nullid, nullid)
 
+        self.assertEqual(f.storageinfo(), {})
+        self.assertEqual(f.storageinfo(revisionscount=True, trackedsize=True),
+                         {'revisionscount': 1, 'trackedsize': len(fulltext)})
+
         self.assertEqual(f.rawsize(0), len(fulltext))
 
         with self.assertRaises(IndexError):
@@ -553,6 +561,14 @@
             node1 = f.add(fulltext1, None, tr, 1, node0, nullid)
             node2 = f.add(fulltext2, None, tr, 3, node1, nullid)
 
+        self.assertEqual(f.storageinfo(), {})
+        self.assertEqual(
+            f.storageinfo(revisionscount=True, trackedsize=True),
+            {
+                'revisionscount': 3,
+                'trackedsize': len(fulltext0) + len(fulltext1) + len(fulltext2),
+            })
+
         self.assertEqual(f.rawsize(0), len(fulltext0))
         self.assertEqual(f.rawsize(1), len(fulltext1))
         self.assertEqual(f.rawsize(2), len(fulltext2))