New cpp folder structure

Signed-off-by: Alexander Borsuk <me@alex.bio>

libs/routing/routing_tests/coding_test.cpp

@@ -0,0 +1,94 @@
+#include "testing/testing.hpp"
+
+#include "routing/coding.hpp"
+
+#include <cstdint>
+#include <limits>
+#include <type_traits>
+
+using namespace routing;
+
+namespace
+{
+template <typename T, typename ToDo>
+void ForEachNumber(ToDo && toDo)
+{
+  for (T number = std::numeric_limits<T>::min();; ++number)
+  {
+    toDo(number);
+
+    if (number == std::numeric_limits<T>::max())
+      break;
+  }
+}
+
+template <typename T>
+void TestZigZag(T prev, T current)
+{
+  auto const delta = EncodeZigZagDelta(prev, current);
+  auto const decodedCurrent = DecodeZigZagDelta(prev, delta);
+  TEST_EQUAL(decodedCurrent, current, ("prev:", prev, "delta:", delta));
+}
+
+template <typename T>
+void TestZigZagUnsigned()
+{
+  static_assert(std::is_unsigned<T>::value, "T should be an unsigned type");
+
+  constexpr auto max = std::numeric_limits<T>::max();
+  constexpr T values[] = {0, 1, 7, max / 2, max - 1, max};
+  for (T prev : values)
+  {
+    for (T current : values)
+      TestZigZag(prev, current);
+  }
+}
+
+template <typename T>
+void TestZigZagSigned()
+{
+  static_assert(std::is_signed<T>::value, "T should be a signed type");
+
+  constexpr auto min = std::numeric_limits<T>::min();
+  constexpr auto max = std::numeric_limits<T>::max();
+  constexpr T values[] = {min, min + 1, min / 2, -7, -1, 0, 1, 7, max / 2, max - 1, max};
+  for (T prev : values)
+  {
+    for (T current : values)
+      TestZigZag(prev, current);
+  }
+}
+}  // namespace
+
+namespace routing_test
+{
+UNIT_TEST(ModuleCastTest)
+{
+  ForEachNumber<uint8_t>([](uint8_t number) {
+    auto signedNumber = ModularCast(number);
+    static_assert(std::is_same<decltype(signedNumber), int8_t>::value, "int8_t expected");
+    TEST_EQUAL(static_cast<uint8_t>(signedNumber), number, ("signedNumber:", signedNumber));
+  });
+}
+
+UNIT_TEST(ZigZagUint8)
+{
+  ForEachNumber<uint8_t>([](uint8_t prev) {
+    ForEachNumber<uint8_t>([&](uint8_t current) { TestZigZag(prev, current); });
+  });
+}
+
+UNIT_TEST(ZigZagInt8)
+{
+  ForEachNumber<int8_t>([](int8_t prev) {
+    ForEachNumber<int8_t>([&](int8_t current) { TestZigZag(prev, current); });
+  });
+}
+
+UNIT_TEST(ZigZagUint16) { TestZigZagUnsigned<uint16_t>(); }
+UNIT_TEST(ZigZagInt16) { TestZigZagSigned<int16_t>(); }
+UNIT_TEST(ZigZagUint32) { TestZigZagUnsigned<uint32_t>(); }
+UNIT_TEST(ZigZagInt32) { TestZigZagSigned<int32_t>(); }
+UNIT_TEST(ZigZagUint64) { TestZigZagUnsigned<uint64_t>(); }
+UNIT_TEST(ZigZagInt64) { TestZigZagSigned<int64_t>(); }
+}  // namespace routing_test