refactor code

Change-Id: Ia2bc49ed8742d79000fd59f7e95fa9b957573c54
diff --git a/tests/core/tree-generation-fixture.t.cpp b/tests/core/tree-generation-fixture.t.cpp
new file mode 100644
index 0000000..a1a9959
--- /dev/null
+++ b/tests/core/tree-generation-fixture.t.cpp
@@ -0,0 +1,112 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/**
+ * Copyright (c) 2014,  Regents of the University of California
+ *
+ * This file is part of NSL (NDN Signature Logger).
+ * See AUTHORS.md for complete list of NSL authors and contributors.
+ *
+ * NSL is free software: you can redistribute it and/or modify it under the terms
+ * of the GNU General Public License as published by the Free Software Foundation,
+ * either version 3 of the License, or (at your option) any later version.
+ *
+ * NSL is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
+ * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
+ * PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * NSL, e.g., in COPYING.md file.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * See AUTHORS.md for complete list of nsl authors and contributors.
+ */
+
+#include "../tree-generator.hpp"
+
+#include "boost-test.hpp"
+
+namespace nsl {
+namespace tests {
+
+BOOST_AUTO_TEST_SUITE(TestTreeGenerator)
+
+BOOST_AUTO_TEST_CASE(HashGeneration)
+{
+  for (size_t n = 5; n <= 8; n++) {
+    auto hash1 = TreeGenerator::getHash(Node::Index(0, 3), n);
+    SubTreeBinary tree(TreeGenerator::LOGGER_NAME, Node::Index(0, 5),
+                       [&] (const Node::Index&) {},
+                       [&] (const Node::Index&,
+                            const NonNegativeInteger&,
+                            ndn::ConstBufferPtr) {});
+    for (size_t i = 0; i < n; i++) {
+      auto node = make_shared<Node>(i, 0, i + 1, Node::getEmptyHash());
+      tree.addLeaf(node);
+    }
+    auto hash2 = tree.getRoot()->getHash();
+    BOOST_CHECK_EQUAL_COLLECTIONS(hash1->begin(), hash1->end(), hash2->begin(), hash2->end());
+  }
+
+  for (size_t n = 33; n <= 64; n++) {
+    auto hash1 = TreeGenerator::getHash(Node::Index(32, 5), n);
+    SubTreeBinary tree(TreeGenerator::LOGGER_NAME, Node::Index(32, 5),
+                       [&] (const Node::Index&) {},
+                       [&] (const Node::Index&,
+                            const NonNegativeInteger&,
+                            ndn::ConstBufferPtr) {});
+    for (size_t i = 32; i < n; i++) {
+      auto node = make_shared<Node>(i, 0, i + 1, Node::getEmptyHash());
+      tree.addLeaf(node);
+    }
+    auto hash2 = tree.getRoot()->getHash();
+    BOOST_CHECK_EQUAL_COLLECTIONS(hash1->begin(), hash1->end(), hash2->begin(), hash2->end());
+  }
+}
+
+BOOST_AUTO_TEST_CASE(TreeGeneration)
+{
+  for (size_t n = 1; n <= 32; n++) {
+    auto hash1 = TreeGenerator::getSubTreeBinary(Node::Index(0, 5), n)->getRoot()->getHash();
+    SubTreeBinary tree(TreeGenerator::LOGGER_NAME, Node::Index(0, 5),
+                       [&] (const Node::Index&) {},
+                       [&] (const Node::Index&,
+                            const NonNegativeInteger&,
+                            ndn::ConstBufferPtr) {});
+    for (size_t i = 0; i < n; i++) {
+      auto node = make_shared<Node>(i, 0, i + 1, Node::getEmptyHash());
+      tree.addLeaf(node);
+    }
+    auto hash2 = tree.getRoot()->getHash();
+    BOOST_CHECK_EQUAL_COLLECTIONS(hash1->begin(), hash1->end(), hash2->begin(), hash2->end());
+  }
+
+  for (size_t n = 33; n <= 64; n++) {
+    auto hash1 = TreeGenerator::getSubTreeBinary(Node::Index(32, 5), n)->getRoot()->getHash();
+    SubTreeBinary tree(TreeGenerator::LOGGER_NAME, Node::Index(32, 5),
+                       [&] (const Node::Index&) {},
+                       [&] (const Node::Index&,
+                            const NonNegativeInteger&,
+                            ndn::ConstBufferPtr) {});
+    for (size_t i = 32; i < n; i++) {
+      auto node = make_shared<Node>(i, 0, i + 1, Node::getEmptyHash());
+      tree.addLeaf(node);
+    }
+    auto hash2 = tree.getRoot()->getHash();
+    BOOST_CHECK_EQUAL_COLLECTIONS(hash1->begin(), hash1->end(), hash2->begin(), hash2->end());
+  }
+
+  for (size_t n = 513; n <= 1024; n++) {
+    auto hash1 = TreeGenerator::getSubTreeBinary(Node::Index(0, 10), n)->getRoot()->getHash();
+    auto hash2 = TreeGenerator::getHash(Node::Index(0, 10), n);
+    BOOST_CHECK_EQUAL_COLLECTIONS(hash1->begin(), hash1->end(), hash2->begin(), hash2->end());
+  }
+
+  for (size_t n = 1025; n <= 2048; n++) {
+    auto hash1 = TreeGenerator::getSubTreeBinary(Node::Index(1024, 10), n)->getRoot()->getHash();
+    auto hash2 = TreeGenerator::getHash(Node::Index(1024, 10), n);
+    BOOST_CHECK_EQUAL_COLLECTIONS(hash1->begin(), hash1->end(), hash2->begin(), hash2->end());
+  }
+}
+
+BOOST_AUTO_TEST_SUITE_END()
+
+} // namespace tests
+} // namespace nsl