test: Move test objects to libtest

Create a subdirectory to contain the libtest helper library.

Define two variables to clarify when tests are aimed at public or
internal components.

Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

test/test.h

@@ -1,32 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-or-later */
-/*
- * Copyright (C) 2018, Google Inc.
- *
- * test.h - libcamera test base class
- */
-#ifndef __TEST_TEST_H__
-#define __TEST_TEST_H__
-
-#include <sstream>
-
-class Test
-{
-public:
-	Test();
-	virtual ~Test();
-
-	int execute();
-
-protected:
-	virtual int init() { return 0; }
-	virtual int run() = 0;
-	virtual void cleanup() { }
-};
-
-#define TEST_REGISTER(klass)						\
-int main(int argc, char *argv[])					\
-{									\
-	return klass().execute();					\
-}
-
-#endif /* __TEST_TEST_H__ */