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Fix the handling of skipped tests so that it follows what automake does.

Upstream-Status: Backport [https://bugzilla.gnome.org/show_bug.cgi?id=720263]
Signed-off-by: Ross Burton <ross.burton@intel.com>

diff --git a/glib/gtestutils.c b/glib/gtestutils.c
index bc7bbcf..feaafa3 100644
--- a/glib/gtestutils.c
+++ b/glib/gtestutils.c
@@ -607,9 +607,10 @@ static gchar      *test_run_name = "";
 static GSList    **test_filename_free_list;
 static guint       test_run_forks = 0;
 static guint       test_run_count = 0;
+static guint       test_skipped_count = 0;
 static GTestResult test_run_success = G_TEST_RUN_FAILURE;
 static gchar      *test_run_msg = NULL;
-static guint       test_skip_count = 0;
+static guint       test_startup_skip_count = 0;
 static GTimer     *test_user_timer = NULL;
 static double      test_user_stamp = 0;
 static GSList     *test_paths = NULL;
@@ -765,6 +766,8 @@ g_test_log (GTestLogType lbit,
             g_print ("Bail out!\n");
           abort();
         }
+      if (largs[0] == G_TEST_RUN_SKIPPED)
+        test_skipped_count++;
       break;
     case G_TEST_LOG_MIN_RESULT:
       if (test_tap_log)
@@ -869,11 +872,11 @@ parse_args (gint    *argc_p,
         {
           gchar *equal = argv[i] + 16;
           if (*equal == '=')
-            test_skip_count = g_ascii_strtoull (equal + 1, NULL, 0);
+            test_startup_skip_count = g_ascii_strtoull (equal + 1, NULL, 0);
           else if (i + 1 < argc)
             {
               argv[i++] = NULL;
-              test_skip_count = g_ascii_strtoull (argv[i], NULL, 0);
+              test_startup_skip_count = g_ascii_strtoull (argv[i], NULL, 0);
             }
           argv[i] = NULL;
         }
@@ -1516,14 +1519,21 @@ g_test_get_root (void)
  * g_test_run_suite() or g_test_run() may only be called once
  * in a program.
  *
- * Returns: 0 on success
+ * Returns: 0 on success, 1 on failure (assuming it returns at all),
+ *   77 if all tests were skipped with g_test_skip().
  *
  * Since: 2.16
  */
 int
 g_test_run (void)
 {
-  return g_test_run_suite (g_test_get_root());
+  if (g_test_run_suite (g_test_get_root()) != 0)
+    return 1;
+
+  if (test_run_count > 0 && test_run_count == test_skipped_count)
+    return 77;
+  else
+    return 0;
 }
 
 /**
@@ -2063,7 +2073,7 @@ test_case_run (GTestCase *tc)
         }
     }
 
-  if (++test_run_count <= test_skip_count)
+  if (++test_run_count <= test_startup_skip_count)
     g_test_log (G_TEST_LOG_SKIP_CASE, test_run_name, NULL, 0, NULL);
   else if (test_run_list)
     {
@@ -2117,7 +2127,8 @@ test_case_run (GTestCase *tc)
   g_free (test_uri_base);
   test_uri_base = old_base;
 
-  return success == G_TEST_RUN_SUCCESS;
+  return (success == G_TEST_RUN_SUCCESS ||
+          success == G_TEST_RUN_SKIPPED);
 }
 
 static int
diff --git a/glib/tests/testing.c b/glib/tests/testing.c
index 20c2e79..1025f12 100644
--- a/glib/tests/testing.c
+++ b/glib/tests/testing.c
@@ -575,10 +575,93 @@ test_nonfatal (void)
   g_test_trap_assert_stdout ("*The End*");
 }
 
+static void
+test_skip (void)
+{
+  g_test_skip ("Skipped should count as passed, not failed");
+}
+
+static void
+test_pass (void)
+{
+}
+
+static const char *argv0;
+
+static void
+test_skip_all (void)
+{
+  GPtrArray *argv;
+  GError *error = NULL;
+  int status;
+
+  argv = g_ptr_array_new ();
+  g_ptr_array_add (argv, (char *) argv0);
+  g_ptr_array_add (argv, "--GTestSubprocess");
+  g_ptr_array_add (argv, "-p");
+  g_ptr_array_add (argv, "/misc/skip");
+  g_ptr_array_add (argv, NULL);
+
+  g_spawn_sync (NULL, (char **) argv->pdata, NULL,
+                G_SPAWN_STDOUT_TO_DEV_NULL | G_SPAWN_STDERR_TO_DEV_NULL,
+                NULL, NULL, NULL, NULL, &status,
+                &error);
+  g_assert_no_error (error);
+
+  g_spawn_check_exit_status (status, &error);
+  g_assert_error (error, G_SPAWN_EXIT_ERROR, 77);
+  g_clear_error (&error);
+
+  g_ptr_array_set_size (argv, 0);
+  g_ptr_array_add (argv, (char *) argv0);
+  g_ptr_array_add (argv, "--GTestSubprocess");
+  g_ptr_array_add (argv, "-p");
+  g_ptr_array_add (argv, "/misc/skip");
+  g_ptr_array_add (argv, "-p");
+  g_ptr_array_add (argv, "/misc/skip-all/subprocess/skip1");
+  g_ptr_array_add (argv, "-p");
+  g_ptr_array_add (argv, "/misc/skip-all/subprocess/skip2");
+  g_ptr_array_add (argv, NULL);
+
+  g_spawn_sync (NULL, (char **) argv->pdata, NULL,
+                G_SPAWN_STDOUT_TO_DEV_NULL | G_SPAWN_STDERR_TO_DEV_NULL,
+                NULL, NULL, NULL, NULL, &status,
+                &error);
+  g_assert_no_error (error);
+
+  g_spawn_check_exit_status (status, &error);
+  g_assert_error (error, G_SPAWN_EXIT_ERROR, 77);
+  g_clear_error (&error);
+
+  g_ptr_array_set_size (argv, 0);
+  g_ptr_array_add (argv, (char *) argv0);
+  g_ptr_array_add (argv, "--GTestSubprocess");
+  g_ptr_array_add (argv, "-p");
+  g_ptr_array_add (argv, "/misc/skip");
+  g_ptr_array_add (argv, "-p");
+  g_ptr_array_add (argv, "/misc/skip-all/subprocess/pass");
+  g_ptr_array_add (argv, "-p");
+  g_ptr_array_add (argv, "/misc/skip-all/subprocess/skip1");
+  g_ptr_array_add (argv, NULL);
+
+  g_spawn_sync (NULL, (char **) argv->pdata, NULL,
+                G_SPAWN_STDOUT_TO_DEV_NULL | G_SPAWN_STDERR_TO_DEV_NULL,
+                NULL, NULL, NULL, NULL, &status,
+                &error);
+  g_assert_no_error (error);
+
+  g_spawn_check_exit_status (status, &error);
+  g_assert_no_error (error);
+
+  g_ptr_array_unref (argv);
+}
+
 int
 main (int   argc,
       char *argv[])
 {
+  argv0 = argv[0];
+
   g_test_init (&argc, &argv, NULL);
 
   g_test_add_func ("/random-generator/rand-1", test_rand1);
@@ -633,5 +716,11 @@ main (int   argc,
 
   g_test_add_func ("/misc/nonfatal", test_nonfatal);
 
+  g_test_add_func ("/misc/skip", test_skip);
+  g_test_add_func ("/misc/skip-all", test_skip_all);
+  g_test_add_func ("/misc/skip-all/subprocess/skip1", test_skip);
+  g_test_add_func ("/misc/skip-all/subprocess/skip2", test_skip);
+  g_test_add_func ("/misc/skip-all/subprocess/pass", test_pass);
+
   return g_test_run();
 }