added very basic test

tests/Basics/RocksDBKeyTest.cpp

@@ -0,0 +1,84 @@
+////////////////////////////////////////////////////////////////////////////////
+/// @brief test suite for PathEnumerator class
+///
+/// @file
+///
+/// DISCLAIMER
+///
+/// Copyright 2004-2012 triagens GmbH, Cologne, Germany
+///
+/// Licensed under the Apache License, Version 2.0 (the "License");
+/// you may not use this file except in compliance with the License.
+/// You may obtain a copy of the License at
+///
+///     http://www.apache.org/licenses/LICENSE-2.0
+///
+/// Unless required by applicable law or agreed to in writing, software
+/// distributed under the License is distributed on an "AS IS" BASIS,
+/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+/// See the License for the specific language governing permissions and
+/// limitations under the License.
+///
+/// Copyright holder is triAGENS GmbH, Cologne, Germany
+///
+/// @author Jan Steemann
+/// @author Copyright 2015, ArangoDB GmbH, Cologne, Germany
+////////////////////////////////////////////////////////////////////////////////
+
+#include "Basics/Common.h"
+
+#include "catch.hpp"
+
+#include "RocksDBEngine/RocksDBKey.h"
+#include "RocksDBEngine/RocksDBTypes.h"
+#include "Basics/Exceptions.h"
+
+using namespace arangodb;
+
+// -----------------------------------------------------------------------------
+// --SECTION--                                                        test suite
+// -----------------------------------------------------------------------------
+
+/// @brief setup
+TEST_CASE("RocksDBKeyTest", "[rocksdbkeytest]") {
+
+/// @brief test database
+SECTION("test_database") {
+  RocksDBKey key1 = RocksDBKey::Database(0); 
+  auto const& s1 = key1.string();
+  
+  CHECK(s1.size() == sizeof(char) + sizeof(uint64_t));
+  CHECK(s1 == std::string("0\0\0\0\0\0\0\0\0\0", 9));
+  
+  RocksDBKey key2 = RocksDBKey::Database(1); 
+  auto const& s2 = key2.string();
+  
+  CHECK(s2.size() == sizeof(char) + sizeof(uint64_t));
+  CHECK(s2 == std::string("0\1\0\0\0\0\0\0\0\0", 9));
+  
+  RocksDBKey key3 = RocksDBKey::Database(255); 
+  auto const& s3 = key3.string();
+  
+  CHECK(s3.size() == sizeof(char) + sizeof(uint64_t));
+  CHECK(s3 == std::string("0\xff\0\0\0\0\0\0\0\0", 9));
+  
+  RocksDBKey key4 = RocksDBKey::Database(256); 
+  auto const& s4 = key4.string();
+  
+  CHECK(s4.size() == sizeof(char) + sizeof(uint64_t));
+  CHECK(s4 == std::string("0\0\x01\0\0\0\0\0\0\0", 9));
+  
+  RocksDBKey key5 = RocksDBKey::Database(49152); 
+  auto const& s5 = key5.string();
+  
+  CHECK(s5.size() == sizeof(char) + sizeof(uint64_t));
+  CHECK(s5 == std::string("0\0\xc0\0\0\0\0\0\0\0", 9));
+  
+  RocksDBKey key6 = RocksDBKey::Database(12345678901); 
+  auto const& s6 = key6.string();
+  
+  CHECK(s6.size() == sizeof(char) + sizeof(uint64_t));
+  CHECK(s6 == std::string("0\x35\x1c\xdc\xdf\x02\0\0\0", 9));
+}
+
+}