Make g_test_run() return 77 if all tests are skipped

Change g_test_run() to return 1 on failure (rather than the number of
failed tests), and 77 if all tests are skipped (since automake and
some other test harnesses recognize that status code).

Previously g_test_run() returned the number of failed tests, but this
behavior was not documented, and at any rate, prior to 2.39,
g_test_run() would normally not return at all if an error occurred.

https://bugzilla.gnome.org/show_bug.cgi?id=720263

glib/gtestutils.c

@@ -607,6 +607,7 @@ 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_startup_skip_count = 0;
@@ -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)
@@ -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;
 }
 
 /**

glib/tests/testing.c

@@ -581,10 +581,87 @@ 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);
@@ -640,6 +717,10 @@ 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();
 }