New cpp folder structure

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

libs/coding/coding_tests/mem_file_writer_test.cpp

@@ -0,0 +1,30 @@
+#include "testing/testing.hpp"
+
+#include "coding/writer.hpp"
+#include "coding/file_writer.hpp"
+
+#include "base/macros.hpp"
+
+#include <vector>
+
+UNIT_TEST(MemWriterEmpty)
+{
+  std::vector<char> data;
+  {
+    MemWriter<std::vector<char>> writer(data);
+  }
+  TEST(data.empty(), (data));
+}
+
+UNIT_TEST(MemWriterSimple)
+{
+  std::vector<char> data;
+  MemWriter<std::vector<char>> writer(data);
+  writer.Write("Hello", 5);
+  writer.Write(",", 1);
+  writer.Write("world!", 6);
+
+  char const expected[] = "Hello,world!";
+  TEST_EQUAL(data.size(), ARRAY_SIZE(expected)-1, ());
+  TEST(equal(data.begin(), data.end(), &expected[0]), (data));
+}