tried to add functional unit test

Signed-off-by: RomanBapst <bapstroman@gmail.com>

src/modules/navigator/MissionFeasibility/CMakeLists.txt

@@ -1,4 +1,5 @@
 px4_add_library(mission_feasibility_checker
-	FeasibilityChecker.hpp
 	FeasibilityChecker.cpp
 )
+
+px4_add_functional_gtest(SRC FeasibilityCheckerTest.cpp LINKLIBS mission_feasibility_checker test_stubs)

src/modules/navigator/MissionFeasibility/FeasibilityCheckerTest.cpp

@@ -0,0 +1,57 @@
+/****************************************************************************
+ *
+ *   Copyright (C) 2022 PX4 Development Team. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name PX4 nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+#include <gtest/gtest.h>
+#include "FeasibilityChecker.hpp"
+
+// to run: make tests TESTFILTER=FeasibilityChecker
+
+class FeasibilityCheckerTest : public ::testing::Test
+{
+public:
+	void SetUp() override
+	{
+		param_control_autosave(false);
+		param_reset_all();
+	}
+};
+
+class TestFeasibilityChecker : public FeasibilityChecker
+{
+public:
+	TestFeasibilityChecker() : FeasibilityChecker() {}
+	void paramsChanged() {FeasibilityChecker::updateParamsImpl();}
+};
+
+
+TEST_F(FeasibilityCheckerTest, instantiation) { FeasibilityChecker cp(); }