test: Store path to the test executable in Test class

Store the path to the test executable, found in argv[0], in the Test
instance. This can be useful for tests that need to fork processes.

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

test/libtest/test.cpp

@@ -17,6 +17,11 @@ Test::~Test()
 {
 }
 
+void Test::setArgs([[maybe_unused]] int argc, char *argv[])
+{
+	self_ = argv[0];
+}
+
 int Test::execute()
 {
 	int ret;