--- a/tests/test-run-tests.t Fri Jun 13 16:36:53 2014 -0500
+++ b/tests/test-run-tests.t Fri May 30 12:10:56 2014 -0700
@@ -18,3 +18,27 @@
$ $TESTDIR/run-tests.py --with-hg=`which hg`
.
# Ran 1 tests, 0 skipped, 0 warned, 0 failed.
+
+failing test
+==================
+
+ $ cat > test-failure.t << EOF
+ > $ echo babar
+ > rataxes
+ > EOF
+
+ $ $TESTDIR/run-tests.py --with-hg=`which hg`
+
+ --- $TESTTMP/test-failure.t
+ +++ $TESTTMP/test-failure.t.err
+ @@ -1,2 +1,2 @@
+ $ echo babar
+ - rataxes
+ + babar
+
+ ERROR: test-failure.t output changed
+ !.
+ Failed test-failure.t: output changed
+ # Ran 2 tests, 0 skipped, 0 warned, 1 failed.
+ python hash seed: * (glob)
+ [1]