[gtk/wip/otte/widgetfactory-dnd] testsuite: Add contentformat tests

[Benjamin Otte <otte src gnome org>]

commit 472d30195313986485e33fbd9c5cb4747b4e3493
Author: Benjamin Otte <otte redhat com>
Date:   Tue Jul 27 03:25:15 2021 +0200

    testsuite: Add contentformat tests

 testsuite/gdk/contentformats.c | 221 +++++++++++++++++++++++++++++++++++++++++
 testsuite/gdk/meson.build      |   1 +
 2 files changed, 222 insertions(+)
---
diff --git a/testsuite/gdk/contentformats.c b/testsuite/gdk/contentformats.c
new file mode 100644
index 0000000000..d867da2612
--- /dev/null
+++ b/testsuite/gdk/contentformats.c
@@ -0,0 +1,221 @@
+#include <stdlib.h>
+
+#include <gtk/gtk.h>
+
+static GType
+string_type (void)
+{
+  return G_TYPE_STRING;
+}
+
+static struct {
+  GType (* type_func) (void);
+  const char *mime_type;
+} possible_types[] = {
+  /* GTypes go here */
+  { string_type, NULL },
+  { gdk_file_list_get_type, NULL },
+  { gdk_rgba_get_type, NULL },
+  { gdk_texture_get_type, NULL },
+  /* mime types go here */
+  { NULL, "text/plain" },
+  { NULL, "text/plain;charset=utf-8" },
+  { NULL, "image/png" },
+  { NULL, "image/jpeg" },
+  { NULL, "application/x-color" },
+};
+
+#define assert_printf(...) G_STMT_START{ \
+  char *_s = g_strdup_printf (__VA_ARGS__); \
+  g_assertion_message (G_LOG_DOMAIN, __FILE__, __LINE__, G_STRFUNC, _s); \
+  g_free (_s); \
+}G_STMT_END
+
+#define assert_formats_subset(a, b) G_STMT_START{ \
+  const GType *_gtypes; \
+  const char * const *_mime_types; \
+  gsize _i, _n; \
+\
+  _gtypes = gdk_content_formats_get_gtypes (a, &_n); \
+  for (_i = 0; _i < _n; _i++) \
+    { \
+      if (!gdk_content_formats_contain_gtype (b, _gtypes[_i])) \
+        assert_printf (#a " ⊆ " #b ": does not contain GType %s", g_type_name (_gtypes[_i])); \
+    } \
+\
+  _mime_types = gdk_content_formats_get_mime_types (a, &_n); \
+  for (_i = 0; _i < _n; _i++) \
+    { \
+      if (!gdk_content_formats_contain_mime_type (b, _mime_types[_i])) \
+        assert_printf (#a " ⊆ " #b ": does not contain mime type %s", _mime_types[_i]); \
+    } \
+}G_STMT_END
+
+#define assert_formats_equal(a, b) G_STMT_START{\
+  assert_formats_subset(a, b); \
+  assert_formats_subset(b, a); \
+}G_STMT_END
+
+static GdkContentFormats *
+create_random_content_formats (void)
+{
+  GdkContentFormatsBuilder *builder;
+  gsize i, n;
+
+  n = g_test_rand_int_range (0, G_N_ELEMENTS (possible_types));
+  builder = gdk_content_formats_builder_new ();
+
+  for (i = 0; i < n; i++)
+    {
+      if (possible_types[i].type_func)
+        gdk_content_formats_builder_add_gtype (builder, possible_types[i].type_func ());
+      else if (possible_types[i].mime_type)
+        gdk_content_formats_builder_add_mime_type (builder, possible_types[i].mime_type);
+      else
+        g_assert_not_reached ();
+    }
+
+  return gdk_content_formats_builder_free_to_formats (builder);
+}
+
+static void
+test_print_and_parse (void)
+{
+  GdkContentFormats *before, *parsed;
+  char *string_before, *string_parsed;
+  gsize i;
+
+  for (i = 0; i < 100; i++)
+    {
+      before = create_random_content_formats ();
+      string_before = gdk_content_formats_to_string (before);
+
+      parsed = gdk_content_formats_parse (string_before);
+      g_assert (parsed);
+      assert_formats_equal (before, parsed);
+
+      string_parsed = gdk_content_formats_to_string (parsed);
+      g_assert_cmpstr (string_before, ==, string_parsed);
+
+      g_free (string_parsed);
+      g_free (string_before);
+      gdk_content_formats_unref (parsed);
+      gdk_content_formats_unref (before);
+    }
+}
+
+static void
+test_union (void)
+{
+  GdkContentFormatsBuilder *builder;
+  GdkContentFormats *a, *b, *ab, *ab2;
+  gsize i;
+
+  for (i = 0; i < 100; i++)
+    {
+      a = create_random_content_formats ();
+      b = create_random_content_formats ();
+
+      ab = gdk_content_formats_union (gdk_content_formats_ref (a), b);
+      assert_formats_subset (a, ab);
+      assert_formats_subset (b, ab);
+
+      ab2 = gdk_content_formats_union (gdk_content_formats_ref (a), ab);
+      assert_formats_equal (ab, ab2);
+      gdk_content_formats_unref (ab2);
+
+      builder = gdk_content_formats_builder_new ();
+      gdk_content_formats_builder_add_formats (builder, a);
+      gdk_content_formats_builder_add_formats (builder, b);
+      ab2 = gdk_content_formats_builder_free_to_formats (builder);
+      assert_formats_equal (ab, ab2);
+      gdk_content_formats_unref (ab2);
+
+      gdk_content_formats_unref (ab);
+      gdk_content_formats_unref (a);
+      gdk_content_formats_unref (b);
+    }
+}
+
+static void
+append_separator (GString *string)
+{
+  static const char *separators = "\t\n\f\r ";
+
+  do {
+    g_string_append_c (string, separators[g_test_rand_int_range (0, strlen (separators))]);
+  } while (g_test_rand_bit ());
+}
+
+static char *
+fuzzy_print (GdkContentFormats *formats)
+{
+  GString *string;
+  const GType *types;
+  const char * const *mime_types;
+  gsize i, n;
+ 
+  string = g_string_new ("");
+
+  types = gdk_content_formats_get_gtypes (formats, &n);
+  for (i = 0; i < n; i++)
+    {
+      if (string->len)
+        append_separator (string);
+      g_string_append (string, g_type_name (types[i]));
+    }
+
+  mime_types = gdk_content_formats_get_mime_types (formats, &n);
+  for (i = 0; i < n; i++)
+    {
+      if (string->len)
+        append_separator (string);
+      g_string_append (string, mime_types[i]);
+    }
+
+  return g_string_free (string, FALSE);
+}
+
+static void
+test_parse (void)
+{
+  gsize i;
+
+  for (i = 0; i < 100; i++)
+    {
+      GdkContentFormats *formats, *parsed;
+      char *fuzzy;
+
+      formats = create_random_content_formats ();
+      fuzzy = fuzzy_print (formats);
+      parsed = gdk_content_formats_parse (fuzzy);
+      assert_formats_equal (formats, parsed);
+
+      g_free (fuzzy);
+      gdk_content_formats_unref (parsed);
+      gdk_content_formats_unref (formats);
+    }
+}
+
+int
+main (int argc, char *argv[])
+{
+  gsize i;
+
+  (g_test_init) (&argc, &argv, NULL);
+
+  gtk_init ();
+
+  /* Ensure all the types we care about to exist */
+  for (i = 0; i < G_N_ELEMENTS(possible_types); i++)
+    {
+      if (possible_types[i].type_func)
+        g_type_ensure (possible_types[i].type_func ());
+    }
+
+  g_test_add_func ("/contentformats/parse", test_parse);
+  g_test_add_func ("/contentformats/print_and_parse", test_print_and_parse);
+  g_test_add_func ("/contentformats/union", test_union);
+
+  return g_test_run ();
+}
diff --git a/testsuite/gdk/meson.build b/testsuite/gdk/meson.build
index 50bfd0b5d0..5e62e98775 100644
--- a/testsuite/gdk/meson.build
+++ b/testsuite/gdk/meson.build
@@ -13,6 +13,7 @@ tests = [
   'array',
   'cairo',
   'clipboard',
+  'contentformats',
   'contentserializer',
   'cursor',
   'display',