[pango/small-caps] Add a test for small caps

[Matthias Clasen <matthiasc src gnome org>]

commit 30d6756a2984e114952431687fe11f5d9c1659dd
Author: Matthias Clasen <mclasen redhat com>
Date:   Fri Nov 5 20:50:01 2021 -0400

    Add a test for small caps
    
    Add a test that verifies that PANGO_VARIANT_SMALL_CAPS
    survives a roundtrip from font description to font and
    back, and that it shows up in the font as smcp=1 in
    the OpenType features.

 tests/test-font.c | 41 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)
---
diff --git a/tests/test-font.c b/tests/test-font.c
index c3a1c29f..cd243a95 100644
--- a/tests/test-font.c
+++ b/tests/test-font.c
@@ -278,6 +278,46 @@ test_roundtrip_plain (void)
   g_object_unref (context);
 }
 
+static void
+test_roundtrip_small_caps (void)
+{
+  PangoFontMap *fontmap;
+  PangoContext *context;
+  PangoFontDescription *desc, *desc2;
+  PangoFont *font;
+  hb_feature_t features[32];
+  guint num = 0;
+
+  if (strcmp (G_OBJECT_TYPE_NAME (pango_cairo_font_map_get_default ()), "PangoCairoCoreTextFontMap") == 0)
+    {
+      g_test_skip ("Small Caps support needs to be added to PangoCoreTextFontMap");
+      return;
+    }
+
+  desc = pango_font_description_from_string ("Cantarell Small-Caps 11");
+
+  g_assert_true (pango_font_description_get_variant (desc) == PANGO_VARIANT_SMALL_CAPS);
+
+  fontmap = pango_cairo_font_map_get_default ();
+  context = pango_font_map_create_context (fontmap);
+
+  font = pango_context_load_font (context, desc);
+  desc2 = pango_font_describe (font);
+
+  pango_font_get_features (font, features, G_N_ELEMENTS (features), &num);
+  g_assert_true (num == 1);
+  g_assert_true (features[0].tag == HB_TAG ('s', 'm', 'c', 'p'));
+  g_assert_true (features[0].value == 1);
+  g_assert_true (pango_font_description_get_variant (desc2) == PANGO_VARIANT_SMALL_CAPS);
+
+  g_assert_true (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)
 {
@@ -472,6 +512,7 @@ main (int argc, char *argv[])
   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/small-caps", test_roundtrip_small_caps);
   g_test_add_func ("/pango/font/roundtrip/emoji", test_roundtrip_emoji);
   g_test_add_func ("/pango/font/models", test_font_models);
   g_test_add_func ("/pango/font/glyph-extents", test_glyph_extents);