diff --git a/tests/test-diff-hashes b/tests/test-diff-hashes
new file mode 100755
--- /dev/null
+++ b/tests/test-diff-hashes
@@ -0,0 +1,26 @@
+#!/bin/sh
+
+hg init a
+cd a
+echo bar > foo
+hg add foo
+hg ci -m 'add foo' -d '1000000 0'
+
+echo foobar > foo
+hg ci -m 'change foo' -d '1000001 0'
+
+echo 'quiet:'
+hg --quiet diff -r 0 -r 1
+echo
+
+echo 'normal:'
+hg diff -r 0 -r 1
+echo
+
+echo 'verbose:'
+hg --verbose diff -r 0 -r 1
+echo
+
+echo 'debug:'
+hg --debug diff -r 0 -r 1
+echo