Add a function to check test status from the inside

The new g_test_failed() function can be used to find
out if a currently running testcase is already marked
as failed.

https://bugzilla.gnome.org/show_bug.cgi?id=692125

glib/gtestutils.c

@@ -1631,6 +1631,30 @@ g_test_skip (const gchar *msg)
   test_run_msg = g_strdup (msg);
 }
 
+/**
+ * g_test_failed:
+ *
+ * Returns whether a test has already failed. This will
+ * be the case when g_test_fail(), g_test_incomplete()
+ * or g_test_skip() have been called, but also if an
+ * assertion has failed.
+ *
+ * This can be useful to return early from a test if
+ * continuing after a failed assertion might be harmful.
+ *
+ * The return value of this function is only meaningful
+ * if it is called from inside a test function.
+ *
+ * Returns: %TRUE if the test has failed
+ *
+ * Since: 2.38
+ */
+gboolean
+g_test_failed (void)
+{
+  return test_run_success != G_TEST_RUN_SUCCESS;
+}
+
 /**
  * GTestFunc:
  *

glib/gtestutils.h

@@ -133,6 +133,8 @@ GLIB_AVAILABLE_IN_2_38
 void    g_test_incomplete               (const gchar *msg);
 GLIB_AVAILABLE_IN_2_38
 void    g_test_skip                     (const gchar *msg);
+GLIB_AVAILABLE_IN_2_38
+gboolean g_test_failed                  (void);
 
 /* hook up a test with fixture under test path */
 #define g_test_add(testpath, Fixture, tdata, fsetup, ftest, fteardown) \