tests: Expand test coverage for flatpak_get_lang_from_locale()

Signed-off-by: Simon McVittie <smcv@collabora.com>

tests/Makefile.am.inc

@@ -120,6 +120,10 @@ test_instance_SOURCES = \
 	tests/test-instance.c \
 	$(NULL)
 
+test_locale_utils_CFLAGS = $(testcommon_CFLAGS)
+test_locale_utils_LDADD = $(testcommon_LDADD) libtestlib.la
+test_locale_utils_SOURCES = tests/test-locale-utils.c
+
 test_portal_CFLAGS = $(testcommon_CFLAGS)
 test_portal_LDADD = $(testcommon_LDADD) libtestlib.la
 test_portal_SOURCES = \
@@ -300,6 +304,7 @@ test_programs = \
 	test-context \
 	test-exports \
 	test-instance \
+	test-locale-utils \
 	test-portal \
 	testapp \
 	testcommon \

tests/meson.build

@@ -108,6 +108,7 @@ c_tests = [
       libglnx_testlib_dep,
     ],
   }],
+  ['test-locale-utils', {}],
   ['test-portal', {
     'extra_sources' : [
       portal_gdbus[0],

tests/test-locale-utils.c

@@ -0,0 +1,64 @@
+/*
+ * Copyright 2023 Collabora Ltd.
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
+
+#include "config.h"
+
+#include <glib.h>
+#include "libglnx.h"
+#include "flatpak.h"
+
+#include "flatpak-utils-private.h"
+
+#include "tests/testlib.h"
+
+static const struct
+{
+  const char *in;
+  const char *expected;
+} lang_from_locale_tests[] =
+{
+  { "C", NULL },
+  { "C.UTF-8", NULL },
+  { "en.ISO-8859-15", "en" },
+  { "en@cantab", "en" },
+  { "en_GB", "en" },
+  { "en_US.utf8", "en" },
+  { "sv_FI@euro", "sv" },
+};
+
+static void
+test_lang_from_locale (void)
+{
+  gsize i;
+
+  for (i = 0; i < G_N_ELEMENTS (lang_from_locale_tests); i++)
+    {
+      const char *in = lang_from_locale_tests[i].in;
+      const char *expected = lang_from_locale_tests[i].expected;
+      g_autofree char *actual = NULL;
+
+      g_test_message ("%s", in);
+      actual = flatpak_get_lang_from_locale (in);
+      g_test_message ("-> %s", actual ? actual : "(null)");
+      g_assert_cmpstr (actual, ==, expected);
+    }
+}
+
+int
+main (int argc, char *argv[])
+{
+  int res;
+
+  g_test_init (&argc, &argv, NULL);
+  isolated_test_dir_global_setup ();
+
+  g_test_add_func ("/locale/lang-from-locale", test_lang_from_locale);
+
+  res = g_test_run ();
+
+  isolated_test_dir_global_teardown ();
+
+  return res;
+}

tests/testcommon.c

@@ -632,19 +632,6 @@ test_subpaths_merge (void)
   g_clear_pointer (&res, g_strfreev);
 }
 
-static void
-test_lang_from_locale (void)
-{
-  g_autofree char *lang = NULL;
-
-  lang = flatpak_get_lang_from_locale ("en_US.utf8");
-  g_assert_cmpstr (lang, ==, "en");
-  g_clear_pointer (&lang, g_free);
-
-  lang = flatpak_get_lang_from_locale ("sv_FI@euro");
-  g_assert_cmpstr (lang, ==, "sv");
-}
-
 static void
 test_parse_appdata (void)
 {
@@ -1376,7 +1363,6 @@ main (int argc, char *argv[])
   g_test_add_func ("/common/string-to-unsigned", test_string_to_unsigned);
   g_test_add_func ("/common/levenshtein", test_levenshtein);
   g_test_add_func ("/common/subpaths-merge", test_subpaths_merge);
-  g_test_add_func ("/common/lang-from-locale", test_lang_from_locale);
   g_test_add_func ("/common/appdata", test_parse_appdata);
   g_test_add_func ("/common/name-matching", test_name_matching);
   g_test_add_func ("/common/filter_parser", test_filter_parser);