[gdk-pixbuf/issue-123: 3/4] tests: Skip composite test when PNG is unsupported

[Emmanuele Bassi <ebassi src gnome org>]

commit cd2d5abf3f0e8a8e021215d1a55794cd556e9bdb
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Thu Apr 2 12:45:56 2020 +0100

    tests: Skip composite test when PNG is unsupported

 tests/pixbuf-composite.c | 7 +++++++
 1 file changed, 7 insertions(+)
---
diff --git a/tests/pixbuf-composite.c b/tests/pixbuf-composite.c
index d701f472f..14968c491 100644
--- a/tests/pixbuf-composite.c
+++ b/tests/pixbuf-composite.c
@@ -64,6 +64,13 @@ test_composite2 (void)
   GdkPixbuf *src, *dest;
   guchar *pixels, *p;
 
+  char *filename = g_test_get_filename (G_TEST_DIST, "test-image.png", NULL);
+  if (!format_supported (filename))
+    {
+      g_test_skip ("PNG format not supported");
+      return;
+    }
+
   src = gdk_pixbuf_new_from_file (g_test_get_filename (G_TEST_DIST, "test-image.png", NULL), NULL);
 
   {