New cpp folder structure

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

libs/coding/coding_tests/elias_coder_test.cpp

@@ -0,0 +1,56 @@
+#include "testing/testing.hpp"
+
+#include "coding/bit_streams.hpp"
+#include "coding/elias_coder.hpp"
+#include "coding/reader.hpp"
+#include "coding/writer.hpp"
+
+#include "base/bits.hpp"
+
+#include <cstdint>
+#include <string>
+#include <vector>
+
+namespace
+{
+template <typename TCoder>
+void TestCoder(std::string const & name)
+{
+  using TBuffer = std::vector<uint8_t>;
+  using TWriter = MemWriter<TBuffer>;
+
+  uint64_t const kMask = 0xfedcba9876543210;
+
+  TBuffer buf;
+  {
+    TWriter w(buf);
+    BitWriter<TWriter> bits(w);
+    for (int i = 0; i <= 64; ++i)
+    {
+      uint64_t const mask = bits::GetFullMask(i);
+      uint64_t const value = kMask & mask;
+      if (value == 0)
+        TEST(!TCoder::Encode(bits, value), (name, i));
+      else
+        TEST(TCoder::Encode(bits, value), (name, i));
+    }
+  }
+
+  {
+    MemReader r(buf.data(), buf.size());
+    ReaderSource<MemReader> src(r);
+    BitReader<ReaderSource<MemReader>> bits(src);
+    for (int i = 0; i <= 64; ++i)
+    {
+      uint64_t const mask = bits::GetFullMask(i);
+      uint64_t const expected = kMask & mask;
+      if (expected == 0)
+        continue;
+      TEST_EQUAL(expected, TCoder::Decode(bits), (name, i));
+    }
+  }
+}
+
+UNIT_TEST(EliasCoder_Gamma) { TestCoder<coding::GammaCoder>("Gamma"); }
+UNIT_TEST(EliasCoder_Delta) { TestCoder<coding::DeltaCoder>("Delta"); }
+}  // namespace