tests: ensure run-tests handles multiple lines of churn

1ad0ddf8cccc added the ability to remember lines (including their flags, like glob)
and tolerate them even if the output order varies.

This test ensures that the code will continue to work in the future.

tests/test-run-tests.t

@@ -67,6 +67,30 b' a succesful test'
 failing test
 ==================
 
+test churn with globs
+  $ cat > test-failure.t <<EOF
+  >   $ echo "bar-baz"; echo "bar-bad"
+  >   bar*bad (glob)
+  >   bar*baz (glob)
+  > EOF
+  $ rt test-failure.t
+  
+  --- $TESTTMP/test-failure.t
+  +++ $TESTTMP/test-failure.t.err
+  @@ -1,3 +1,3 @@
+     $ echo "bar-baz"; echo "bar-bad"
+  +  bar*baz (glob)
+     bar*bad (glob)
+  -  bar*baz (glob)
+  
+  ERROR: test-failure.t output changed
+  !
+  Failed test-failure.t: output changed
+  # Ran 1 tests, 0 skipped, 0 warned, 1 failed.
+  python hash seed: * (glob)
+  [1]
+
+basic failing test
   $ cat > test-failure.t << EOF
   >   $ echo babar
   >   rataxes