Add new unit tests

tests/src/lib/Buffer.cpp

@@ -0,0 +1,30 @@
+#include "Buffer.h"
+#include "Arduino.h"
+
+Buffer::Buffer() {
+}
+
+Buffer::Buffer(uint8_t* buf, size_t size) {
+    this->add(buf,size);
+}
+bool Buffer::available() {
+    return this->pos < this->length;
+}
+
+uint8_t Buffer::next() {
+    if (this->available()) {
+        return this->buffer[this->pos++];
+    }
+    return 0;
+}
+
+void Buffer::reset() {
+    this->pos = 0;
+}
+
+void Buffer::add(uint8_t* buf, size_t size) {
+    uint16_t i = 0;
+    for (;i<size;i++) {
+        this->buffer[this->length++] = buf[i];
+    }
+}