t/git-cgi.t: Wait 1 second before doing a revert that should succeed

This hopefully fixes a race condition in which the test failed
around 6% of the time.

If we don't wait, the mtime (which is rounded down to 1 second precision
in the APIs we use) will not necessarily change, so the update will not
necessarily cause the page to be refreshed.

Bug-Debian: https://bugs.debian.org/862494

debian/changelog

@@ -1,3 +1,11 @@
+ikiwiki (3.20170112) UNRELEASED; urgency=medium
+
+  * t/git-cgi.t: Wait 1 second before doing a revert that should work.
+    This hopefully fixes a race condition in which the test failed
+    around 6% of the time. (Closes: 862494)
+
+ -- Simon McVittie <smcv@debian.org>  Sun, 14 May 2017 15:34:52 +0100
+
 ikiwiki (3.20170111) unstable; urgency=high
 
   * passwordauth: prevent authentication bypass via multiple name

t/git-cgi.t

@@ -291,6 +291,10 @@ sub test {
 	$content = readfile('t/tmp/in/two.mdwn');
 	like($content, qr{Here is new content for the second page});
 
+	# We have to wait 1 second here so that new writes are guaranteed
+	# to have a strictly larger mtime.
+	sleep 1;
+
 	# This one can legitimately be reverted
 	$content = run_cgi(method => 'post',
 		params => {