image-inline: add missing test file

followup to 95f7f4dc

pagespeed/automatic/system_tests/shortcut_icons.sh

@@ -0,0 +1,29 @@
+start_test "shortcut icons aren't inlined"
+
+URL="$TEST_ROOT/shortcut_icons.html?PageSpeedFilters=debug,rewrite_images"
+
+# We expect to see just one inline image, because of the img tag.
+fetch_until -save $URL 'grep -c data:image/png' 1
+
+OUT=$(cat $FETCH_UNTIL_OUTFILE)
+
+# All four icon link tags should be optimized but not inlined.
+check_from "$OUT" grep \
+  '<link rel="icon" href="[^<]*xCuppa.png.pagespeed.ic'
+check_from "$OUT" grep \
+  '<link rel="apple-touch-icon" href="[^<]*xCuppa.png.pagespeed.ic'
+check_from "$OUT" grep \
+  '<link rel="apple-touch-icon-precomposed" href="[^<]*xCuppa.png.pagespeed.ic'
+check_from "$OUT" grep \
+  '<link rel="apple-touch-startup-image" href="[^<]*xCuppa.png.pagespeed.ic'
+
+# The image tag should have been inlined instead.
+check_not_from "$OUT" grep \
+  '<img src="[^<]*xCuppa.png.pagespeed.ic'
+
+function appears_exactly_four_times() {
+  test $(grep -c "$@") = 4
+}
+
+check_from "$OUT" appears_exactly_four_times \
+  "The image was not inlined because it is a shortcut icon."