[pango/test-coverage: 15/22] tests: Add tests for PangoLanguage

[Matthias Clasen <matthiasc src gnome org>]

commit 50fc6081ccd859efa60c8d6cc33426f8ef626d8b
Author: Matthias Clasen <mclasen redhat com>
Date:   Sat Jun 26 22:23:25 2021 -0400

    tests: Add tests for PangoLanguage

 tests/meson.build    |  3 ++-
 tests/testlanguage.c | 67 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 69 insertions(+), 1 deletion(-)
---
diff --git a/tests/meson.build b/tests/meson.build
index 83d92b1f..eff95dca 100644
--- a/tests/meson.build
+++ b/tests/meson.build
@@ -22,7 +22,8 @@ tests = [
   [ 'testboundaries' ],
   [ 'testboundaries_ucd' ],
   [ 'testcolor' ],
-  [ 'testscript' ]
+  [ 'testscript' ],
+  [ 'testlanguage' ],
 ]
 
 if build_pangoft2
diff --git a/tests/testlanguage.c b/tests/testlanguage.c
new file mode 100644
index 00000000..35844d46
--- /dev/null
+++ b/tests/testlanguage.c
@@ -0,0 +1,67 @@
+/* Pango
+ * testlanguage.c: Test program for PangoLanguage
+ *
+ * Copyright (C) 2021 Matthias Clasen
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.         See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#include <glib.h>
+#include <pango/pango.h>
+
+static void
+test_language_to_string (void)
+{
+  PangoLanguage *lang;
+
+  lang = pango_language_from_string ("ja-jp");
+  g_assert_cmpstr (pango_language_to_string (lang), ==, "ja-jp");
+  g_assert_cmpstr ((pango_language_to_string) (lang), ==, "ja-jp");
+}
+
+static void
+test_language_env (void)
+{
+  if (g_test_subprocess ())
+    {
+      PangoLanguage **preferred;
+
+      g_setenv ("PANGO_LANGUAGE", "de:ja", TRUE);
+      g_setenv ("LANGUAGE", "fr", TRUE);
+
+      preferred = pango_language_get_preferred ();
+      g_assert_nonnull (preferred);
+      g_assert_true (preferred[0] == pango_language_from_string ("de"));
+      g_assert_true (preferred[1] == pango_language_from_string ("ja"));
+      g_assert_null (preferred[2]);
+
+      return;
+    }
+
+  g_test_trap_subprocess (NULL, 0, 0);
+  g_test_trap_assert_passed ();
+}
+
+int
+main (int argc, char *argv[])
+{
+  g_test_init (&argc, &argv, NULL);
+
+  g_test_add_func ("/language/to-string", test_language_to_string);
+  g_test_add_func ("/language/language-env", test_language_env);
+
+  return g_test_run ();
+}