test-device-fake: Add fake test driver to verify fpi functions

tests/test-device-fake.h

@@ -0,0 +1,43 @@
+/*
+ * Virtual driver for device debugging
+ *
+ * Copyright (C) 2019 Marco Trevisan <marco.trevisan@canonical.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#pragma once
+
+#include "fpi-device.h"
+
+#define FPI_TYPE_DEVICE_FAKE (fpi_device_fake_get_type ())
+G_DECLARE_FINAL_TYPE (FpiDeviceFake, fpi_device_fake, FPI, DEVICE_FAKE, FpDevice)
+
+struct _FpiDeviceFake
+{
+  FpDevice       parent;
+
+  gpointer       last_called_function;
+
+  GError        *ret_error;
+  FpPrint       *ret_print;
+  FpPrint       *ret_match;
+  FpiMatchResult ret_result;
+  FpImage       *ret_image;
+  GPtrArray     *ret_list;
+
+  gpointer       action_data;
+  gpointer       user_data;
+};