Test IPv6 comparison to int32_t (should always not match)

Author: sgryphon

Diff for: test/src/IPAddress/test_operator_parentheses6.cpp

@@ -0,0 +1,44 @@
+/*
+ * Copyright (c) 2020 Arduino.  All rights reserved.
+ */
+
+/**************************************************************************************
+ * INCLUDE
+ **************************************************************************************/
+
+#include <catch.hpp>
+
+#include <IPAddress.h>
+
+/**************************************************************************************
+ * TEST CODE
+ **************************************************************************************/
+
+// These comparisons should always return false, as you can't compare an IPv6 to an int32_t
+
+TEST_CASE ("Testing implicit cast of IPv6 compatible (little endian) to uint32_t always false", "[IPAddress6-Operator-()-01]")
+{
+  // On little endian systems, considering only last four octets (ignoring the rest)
+  arduino::IPAddress ip(0,0, 0,0, 0,0, 0,0, 0,0, 0,0, 129,168, 1,2);
+  uint32_t const val_expected = ip;
+  uint32_t const val_actual = (129 | (168 << 8) | (1 << 16) | (2 << 24));
+  REQUIRE((val_expected == val_actual) == false);
+}
+
+TEST_CASE ("Testing implicit cast of IPv6 full little endian to uint32_t always false", "[IPAddress6-Operator-()-01]")
+{
+  // On little endian systems (full value)
+  arduino::IPAddress ip(129,168, 1,2, 0,0, 0,0, 0,0, 0,0, 0,0, 0,0);
+  uint32_t const val_expected = ip;
+  uint32_t const val_actual = (129 | (168 << 8) | (1 << 16) | (2 << 24));
+  REQUIRE((val_expected == val_actual) == false);
+}
+
+TEST_CASE ("Testing implicit cast of IPv6 to uint32_t always false", "[IPAddress6-Operator-()-01]")
+{
+  // Actual value of the 128-bit IPv6 address, which is network byte order
+  arduino::IPAddress ip(0,0, 0,0, 0,0, 0,0, 0,0, 0,0, 129,168, 1,2);
+  uint32_t const val_expected = ip;
+  uint32_t const val_actual = ((129 << 24) | (168 << 16) | (1 << 8) | 2);
+  REQUIRE((val_expected == val_actual) == false);
+}