[pango/fix-font-roundtrip: 3/3] tests: Add tests for pango_font_describe

[Matthias Clasen <matthiasc src gnome org>]

commit 81016e0dc42c350ede13f63f578e52c169748c9c
Author: Matthias Clasen <mclasen redhat com>
Date:   Sun Jan 24 11:02:21 2021 -0500

    tests: Add tests for pango_font_describe
    
    Test that round-tripping through pango_font_describe
    works. This is currently broken for scalable bitmap
    fonts, such as color Emoji fonts.

 tests/test-font.c | 59 ++++++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 58 insertions(+), 1 deletion(-)
---
diff --git a/tests/test-font.c b/tests/test-font.c
index 0178de85..890872a5 100644
--- a/tests/test-font.c
+++ b/tests/test-font.c
@@ -243,7 +243,62 @@ test_enumerate (void)
   g_object_unref (font);
   pango_font_description_free (desc);
   g_free (faces);
-  g_free (families); 
+  g_free (families);
+  g_object_unref (context);
+}
+
+static void
+test_roundtrip_plain (void)
+{
+  PangoFontMap *fontmap;
+  PangoContext *context;
+  PangoFontDescription *desc, *desc2;
+  PangoFont *font;
+
+  fontmap = pango_cairo_font_map_get_default ();
+  context = pango_font_map_create_context (fontmap);
+
+  desc = pango_font_description_from_string ("Cantarell 11");
+
+  font = pango_context_load_font (context, desc);
+  desc2 = pango_font_describe (font);
+
+  g_assert (pango_font_description_equal (desc2, desc));
+
+  pango_font_description_free (desc2);
+  g_object_unref (font);
+  pango_font_description_free (desc);
+  g_object_unref (context);
+}
+
+static void
+test_roundtrip_emoji (void)
+{
+  PangoFontMap *fontmap;
+  PangoContext *context;
+  PangoFontDescription *desc, *desc2;
+  PangoFont *font;
+
+  fontmap = pango_cairo_font_map_get_default ();
+  context = pango_font_map_create_context (fontmap);
+
+  /* This is how pango_itemize creates the emoji font desc */
+  desc = pango_font_description_from_string ("Cantarell 11");
+  pango_font_description_set_family_static (desc, "emoji");
+
+  font = pango_context_load_font (context, desc);
+  desc2 = pango_font_describe (font);
+
+  /* We can't expect the family name to match, since we go in with
+   * a generic family
+   */
+  pango_font_description_unset_fields (desc, PANGO_FONT_MASK_FAMILY);
+  pango_font_description_unset_fields (desc2, PANGO_FONT_MASK_FAMILY);
+  g_assert (pango_font_description_equal (desc2, desc));
+
+  pango_font_description_free (desc2);
+  g_object_unref (font);
+  pango_font_description_free (desc);
   g_object_unref (context);
 }
 
@@ -263,6 +318,8 @@ main (int argc, char *argv[])
   g_test_add_func ("/pango/fontdescription/variation", test_variation);
   g_test_add_func ("/pango/font/extents", test_extents);
   g_test_add_func ("/pango/font/enumerate", test_enumerate);
+  g_test_add_func ("/pango/font/roundtrip/plain", test_roundtrip_plain);
+  g_test_add_func ("/pango/font/roundtrip/emoji", test_roundtrip_emoji);
 
   return g_test_run ();
 }