Add new unit tests

tests/src/lib/Buffer.h

@@ -0,0 +1,23 @@
+#ifndef buffer_h
+#define buffer_h
+
+#include "Arduino.h"
+
+class Buffer {
+private:
+    uint8_t buffer[1024];
+    uint16_t pos;
+    uint16_t length;
+    
+public:
+    Buffer();
+    Buffer(uint8_t* buf, size_t size);
+    
+    virtual bool available();
+    virtual uint8_t next();
+    virtual void reset();
+    
+    virtual void add(uint8_t* buf, size_t size);
+};
+
+#endif