added integration test code

tests/src/fsfw_tests/integration/devices/TestCookie.h

@@ -0,0 +1,22 @@
+#ifndef MISSION_DEVICES_TESTCOOKIE_H_
+#define MISSION_DEVICES_TESTCOOKIE_H_
+
+#include <fsfw/devicehandlers/CookieIF.h>
+#include <cstddef>
+
+/**
+ * @brief	Really simple cookie which does not do a lot.
+ */
+class TestCookie: public CookieIF {
+public:
+	TestCookie(address_t address, size_t maxReplyLen);
+	virtual ~TestCookie();
+
+	address_t getAddress() const;
+	size_t getReplyMaxLen() const;
+private:
+	address_t address = 0;
+	size_t replyMaxLen = 0;
+};
+
+#endif /* MISSION_DEVICES_TESTCOOKIE_H_ */