tests: add qtest_add_data_func_full

Allows one to specify a destroy function for the test data.

Add a fallback using glib g_test_add_vtable() internal function, whose
signature changed over time. Tested with glib 2.22, 2.26 and 2.48, which
according to git log should be enough to cover all variations.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>

tests/libqtest.c

@@ -758,6 +758,25 @@ void qtest_add_func(const char *str, void (*fn)(void))
     g_free(path);
 }
 
+void qtest_add_data_func_full(const char *str, void *data,
+                              void (*fn)(const void *),
+                              GDestroyNotify data_free_func)
+{
+    gchar *path = g_strdup_printf("/%s/%s", qtest_get_arch(), str);
+#if GLIB_CHECK_VERSION(2, 34, 0)
+    g_test_add_data_func_full(path, data, fn, data_free_func);
+#elif GLIB_CHECK_VERSION(2, 26, 0)
+    /* back-compat casts, remove this once we can require new-enough glib */
+    g_test_add_vtable(path, 0, data, NULL,
+                      (GTestFixtureFunc)fn, (GTestFixtureFunc) data_free_func);
+#else
+    /* back-compat casts, remove this once we can require new-enough glib */
+    g_test_add_vtable(path, 0, data, NULL,
+                      (void (*)(void)) fn, (void (*)(void)) data_free_func);
+#endif
+    g_free(path);
+}
+
 void qtest_add_data_func(const char *str, const void *data,
                          void (*fn)(const void *))
 {

tests/libqtest.h

@@ -425,6 +425,23 @@ void qtest_add_func(const char *str, void (*fn)(void));
 void qtest_add_data_func(const char *str, const void *data,
                          void (*fn)(const void *));
 
+/**
+ * qtest_add_data_func_full:
+ * @str: Test case path.
+ * @data: Test case data
+ * @fn: Test case function
+ * @data_free_func: GDestroyNotify for data
+ *
+ * Add a GTester testcase with the given name, data and function.
+ * The path is prefixed with the architecture under test, as
+ * returned by qtest_get_arch().
+ *
+ * @data is passed to @data_free_func() on test completion.
+ */
+void qtest_add_data_func_full(const char *str, void *data,
+                              void (*fn)(const void *),
+                              GDestroyNotify data_free_func);
+
 /**
  * qtest_add:
  * @testpath: Test case path