Added unit test for virtual destructors

The purpose of this tests is to hihglight the need for a virtual
destructor through valgrind unit test execution

test/CMakeLists.txt

@@ -112,6 +112,7 @@ set(TEST_SRCS
   src/WCharacter/test_isUpperCase.cpp
   src/WCharacter/test_isWhitespace.cpp
   src/WCharacter/test_toAscii.cpp
+  src/Interfaces/test_virtualDestructor.cpp
 )
 
 set(TEST_DUT_SRCS

test/include/TCPClientMock.h

@@ -0,0 +1,45 @@
+/*
+ * Copyright (c) 2020 Arduino.  All rights reserved.
+ *
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
+
+#ifndef TCPCLIENT_MOCK_H_
+#define TCPCLIENT_MOCK_H_
+
+/**************************************************************************************
+ * INCLUDE
+ **************************************************************************************/
+
+#include <api/Client.h>
+
+/**************************************************************************************
+ * CLASS DECLARATION
+ **************************************************************************************/
+
+/*
+ * The purpose of this class is currently to highlight the effects of lacking virtual destructor
+ */
+
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wunused-parameter"
+
+class TCPClientMock : public arduino::Client {
+public:
+  virtual int connect(IPAddress ip, uint16_t port) { return 0; }
+  virtual int connect(const char *host, uint16_t port) { return 0; }
+  virtual size_t write(uint8_t) { return 0; }
+  virtual size_t write(const uint8_t *buf, size_t size) { return 0;}
+  virtual int available() { return 0; }
+  virtual int read() { return 0; }
+  virtual int read(uint8_t *buf, size_t size) { return 0;}
+  virtual int peek() { return 0; }
+  virtual void flush() {}
+  virtual void stop() {}
+  virtual uint8_t connected() { return 0;}
+  virtual operator bool() { return true; }
+};
+#pragma GCC diagnostic pop
+
+
+#endif /* TCPCLIENT_MOCK_H_ */

test/src/Interfaces/test_virtualDestructor.cpp

@@ -0,0 +1,36 @@
+/*
+ * Copyright (c) 2020 Arduino.  All rights reserved.
+ *
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
+
+#include <catch2/catch_test_macros.hpp>
+#include <api/IPAddress.h>
+#include <TCPClientMock.h>
+
+/*
+ * The purpose of these tests is to highlight potential memory leaking
+ * issues that may arise from the lack of virtual destructors.
+ * These test cases will never fail under unit testing,
+ * but they should trigger valgrind error reporting
+ */
+
+TEST_CASE("Testing polymorphic IPAddress memory free", "[ipaddress-delete-01]")
+{
+    arduino::Printable* p = new IPAddress();
+
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wdelete-non-virtual-dtor"
+    delete p;
+#pragma GCC diagnostic pop
+}
+
+TEST_CASE("Testing polymorphic client memory free", "[client-delete-01]")
+{
+    arduino::Client* p = new TCPClientMock;
+
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wdelete-non-virtual-dtor"
+    delete p;
+#pragma GCC diagnostic pop
+}

virtual_destructors_testing/benchmark.sh

@@ -0,0 +1,24 @@
+#!/bin/bash
+
+FQBNS=(
+    arduino-git:renesas_portenta_main:unor4wifi
+    # arduino-git:mbed:envie_m7
+    # arduino-git:avr:uno
+    # arduino-git:samd:mkrwifi1010
+    # arduino-git:mbed:opta
+)
+
+branches=(
+    master
+    virtual-destructors
+)
+
+for branch in "${branches[@]}"; do
+    git checkout $branch
+    for fqbn in $"${FQBNS[@]}"; do
+        echo "compiling for " $fqbn.$branch
+        # arduino-cli compile -b $fqbn | tee $fqbn.$branch.log
+        arduino-cli compile -b $fqbn --build-property "compiler.cpp.extra_flags=\"-fdump-record-layouts\""
+        # /home/agilardoni/.arduino15/packages/arduino/tools/arm-none-eabi-gcc/7-2017q4/bin/arm-none-eabi-size -A /tmp/arduino/sketches/97A7C8915D2115841AF9E1023FFD9539/virtual_destructors_testing.ino.elf | tee $fqbn.$branch.size.log
+    done
+done

virtual_destructors_testing/virtual_destructors_testing.ino

@@ -0,0 +1,55 @@
+
+#if defined(ARDUINO_SAMD_MKR1000)
+  #include <WiFi101.h>
+  #include <WiFiUdp.h>
+#elif defined(ARDUINO_SAMD_MKRWIFI1010) || defined(ARDUINO_SAMD_NANO_33_IOT) || defined(ARDUINO_AVR_UNO_WIFI_REV2) || defined (ARDUINO_NANO_RP2040_CONNECT)
+  #include <WiFiNINA.h>
+  #include <WiFiUdp.h>
+#elif defined(ARDUINO_PORTENTA_H7_M7) || defined(ARDUINO_PORTENTA_H7_M7) || \
+  defined(ARDUINO_NICLA_VISION) || defined(ARDUINO_OPTA) || defined(ARDUINO_GIGA)
+  #include <WiFi.h>
+  #include <WiFiUdp.h>
+#elif defined(ARDUINO_PORTENTA_C33)
+  #include <WiFiC3.h>
+  #include <WiFiUdp.h>
+#elif defined(ARDUINO_ARCH_ESP8266)
+  #include <ESP8266WiFi.h>
+  #include <WiFiUdp.h>
+#elif defined(ARDUINO_ARCH_ESP32)
+  #include <WiFi.h>
+  #include <WiFiUdp.h>
+#elif defined(ARDUINO_UNOR4_WIFI)
+  #include <WiFiS3.h>
+#elif defined(ARDUINO_RASPBERRY_PI_PICO_W)
+  #include <WiFi.h>
+  #include <WiFiUdp.h>
+#endif
+void setup() {
+    Serial.begin(115200);
+
+    while(!Serial);
+
+    Serial.println("Hello world");
+
+#if defined(ARDUINO_SAMD_MKR1000)           || \
+    defined(ARDUINO_SAMD_MKRWIFI1010)       || \
+    defined(ARDUINO_SAMD_NANO_33_IOT)       || \
+    defined(ARDUINO_AVR_UNO_WIFI_REV2)      || \
+    defined(ARDUINO_NANO_RP2040_CONNECT)    || \
+    defined(ARDUINO_PORTENTA_H7_M7)         || \
+    defined(ARDUINO_PORTENTA_H7_M7)         || \
+    defined(ARDUINO_NICLA_VISION)           || \
+    defined(ARDUINO_OPTA)                   || \
+    defined(ARDUINO_GIGA)                   || \
+    defined(ARDUINO_PORTENTA_C33)           || \
+    defined(ARDUINO_ARCH_ESP8266)           || \
+    defined(ARDUINO_ARCH_ESP32)             || \
+    defined(ARDUINO_UNOR4_WIFI)             || \
+    defined(ARDUINO_RASPBERRY_PI_PICO_W)
+    Client *c = new WiFiClient(); // sizeof // as global variable
+    delete c;
+#endif
+}
+
+void loop() {
+}