Stuck on testing Ethernet Class

.arduino-ci.yml

@@ -17,9 +17,11 @@ unittest:
         - mega2560
     libraries:
       - "LiquidCrystal"
+      - "Ethernet"
 
 compile:
     platforms:
       - mega2560
     libraries:
       - "LiquidCrystal"
+      - "Ethernet"

src/Devices/Ethernet_TC.cpp

@@ -0,0 +1,32 @@
+#include "Ethernet_TC.h"
+using namespace std;
+
+TC_ethernet *TC_ethernet::_instance = nullptr;
+
+TC_ethernet::TC_ethernet() {
+  pinMode(4, OUTPUT);
+  digitalWrite(4, HIGH);
+  if (Ethernet.begin(mac) == 0) {
+    Serial.println(F("Failed to configure Ethernet using DHCP"));
+    Ethernet.begin(mac, defaultIP);
+    IP = defaultIP;
+  }
+
+  defaultIP = IPAddress(192, 168, 1, 2);
+  time_serverIP = IPAddress(132, 163, 97, 1);
+}
+
+TC_ethernet *TC_ethernet::getInstance() {
+  if (_instance == nullptr) {
+    _instance = new TC_ethernet;
+  }
+  return _instance;
+}
+
+void TC_ethernet::renewDHCPLease() {
+  // unsigned long current_millis = millis();
+
+  // if (current_millis - previous_lease >= LEASE_INTERVAL) {
+  Ethernet.maintain();
+  // }
+}

src/Devices/Ethernet_TC.h

@@ -0,0 +1,27 @@
+/*
+Based off Arduino's Ethernet library
+Implements a wrapper for the Ethernet Class
+*/
+
+#pragma once
+
+#include "Ethernet.h"
+
+class TC_ethernet {
+public:
+  static TC_ethernet *getInstance();
+  IPAddress getIP() {
+    return IP;
+  };
+  void renewDHCPLease();
+
+protected:
+  TC_ethernet();
+
+private:
+  static TC_ethernet *_instance;
+  byte mac[6] = {0x90, 0xA2, 0xDA, 0x00, 0x00, 0x00};
+  IPAddress defaultIP;
+  IPAddress time_serverIP;
+  IPAddress IP;
+};

test/Ethernet.cpp

@@ -0,0 +1,10 @@
+#include <Arduino.h>
+#include <ArduinoUnitTests.h>
+
+#include "Ethernet_TC.h"
+
+unittest(test) {
+  assertTrue(true);
+}
+
+unittest_main()