diff --git a/inc/FileSystem.hpp b/inc/FileSystem.hpp
index dd1227f..cc225f0 100644
--- a/inc/FileSystem.hpp
+++ b/inc/FileSystem.hpp
@@ -28,6 +28,7 @@ public:
   bool makeLink(const Path& source, const Path& to, bool isDynamic);
 
   void log() const;
+  ui64 size() const;
 
   static const std::string& getLastError();
 
diff --git a/inc/Interpreter.hpp b/inc/Interpreter.hpp
index 995c585..c7db2c6 100644
--- a/inc/Interpreter.hpp
+++ b/inc/Interpreter.hpp
@@ -21,6 +21,9 @@ private:
 
 private:
   std::map<std::string, Command> mCommands;
-  FileSystem mFileSystem;
   std::string mError;
+
+public:
+  FileSystem mFileSystem;
+  bool verbose = true;
 };
\ No newline at end of file
diff --git a/inc/Node.hpp b/inc/Node.hpp
index aa696ee..150f252 100644
--- a/inc/Node.hpp
+++ b/inc/Node.hpp
@@ -37,7 +37,7 @@ public:
   virtual std::shared_ptr<Node> findNode(const std::vector<Key>& path, ui32 currentDepth = 0);
   virtual std::shared_ptr<Node> findNode(const Key& path) { return nullptr; }
 
-  virtual void clearFlags(std::shared_ptr<Node>& directory) {}
+  virtual void clearFlags(std::shared_ptr<Node>& directory);
   virtual bool isHardNode() const;
   virtual void removeIncomingDynamicLinks();
   virtual void removeOutgoingLinks() {}
diff --git a/src/Directory.cpp b/src/Directory.cpp
index 2f491f1..14a6917 100644
--- a/src/Directory.cpp
+++ b/src/Directory.cpp
@@ -55,11 +55,11 @@ void Directory::getMaxDepthUtil(ui32 depth, ui32& maxDepth) const {
 void Directory::dumpUtil(std::stringstream& ss, const Key& key, ui32 currentDepth, std::vector<bool>& indents) {
 
   indents[currentDepth] = true;
-
   indent(ss, currentDepth, indents);
+
   ss << key;
-  // ss << " [" << mIncomingHardLinks.size() << ":" << mIncomingDynamicLinks.size() << "] " << size();
-  ss << " [" << mWorkingNodeFlag.lock().get() << "] ";
+  ss << " [h" << mIncomingHardLinks.size() << ": d" << mIncomingDynamicLinks.size() << "] ";
+  // ss << " [" << mWorkingNodeFlag.lock().get() << "] ";
   ss << "\n";
 
   currentDepth++;
@@ -90,14 +90,6 @@ std::shared_ptr<Node> Directory::clone() const {
     member.second->mParent = out;
   }
 
-  for (auto& member : out->mMembers) {
-    std::shared_ptr<Node>& node = member.second;
-    if (auto linkNode = std::dynamic_pointer_cast<Link>(node)) {
-      auto targetNode = linkNode->getTarget();
-      assert(Link::linkNodes(linkNode, targetNode, linkNode->isHardLink()));
-    }
-  }
-
   return out;
 }
 
diff --git a/src/FileSystem.cpp b/src/FileSystem.cpp
index 27c9c5d..3b535d3 100644
--- a/src/FileSystem.cpp
+++ b/src/FileSystem.cpp
@@ -81,6 +81,11 @@ bool FileSystem::makeDirectory(const Path& path) {
     return true;
   }
 
+  if (parentNode->getType() != Node::DIRECTORY) {
+    gError = "Target path is not a directory";
+    return false;
+  }
+
   auto directory = std::make_shared<Directory>();
   directory->mParent = parentNode;
 
@@ -110,6 +115,11 @@ bool FileSystem::makeFile(const Path& path) {
     return true;
   }
 
+  if (parentNode->getType() != Node::DIRECTORY) {
+    gError = "Target path is not a directory";
+    return false;
+  }
+
   auto newFile = std::make_shared<Node>();
   newFile->mParent = parentNode;
 
@@ -146,6 +156,11 @@ bool FileSystem::makeLink(const Path& source, const Path& target, bool isDynamic
     return false;
   }
 
+  if (parentNodeTarget->getType() != Node::DIRECTORY) {
+    gError = "Target path is not a directory";
+    return false;
+  }
+
   const Key& key = source.getFilename();
 
   if (parentNodeTarget->findNode(key)) {
@@ -161,7 +176,11 @@ bool FileSystem::makeLink(const Path& source, const Path& target, bool isDynamic
     return false;
   }
 
-  assert(parentNodeTarget->attachNode(key, newLink));
+  if (!parentNodeTarget->attachNode(key, newLink)) {
+    log();
+  }
+
+  // assert(parentNodeTarget->attachNode(key, newLink));
   return true;
 }
 
@@ -247,6 +266,7 @@ bool FileSystem::removeFileOrLink(const Path &path) {
     return false;
   }
 
+  existingNode->removeIncomingDynamicLinks();
   existingNode->removeOutgoingLinks();
 
   if (!parentNode->detachNode(path.getFilename())) {
@@ -347,6 +367,11 @@ bool FileSystem::moveNode(const Path &source, const Path &target) {
     return false;
   }
 
+  if (parentNodeTarget->getType() != Node::DIRECTORY) {
+    gError = "Target path is not a directory";
+    return false;
+  }
+
   assert(parentNodeTarget->attachNode(key, sourceNode));
   assert(parentNodeSource->detachNode(key));
 
@@ -395,4 +420,8 @@ bool FileSystem::isPathContains(const std::shared_ptr<Node>& node, const std::sh
   }
 
   return true;
+}
+
+ui64 FileSystem::size() const {
+  return root->size();
 }
\ No newline at end of file
diff --git a/src/Interpreter.cpp b/src/Interpreter.cpp
index ea53237..cf03a4a 100644
--- a/src/Interpreter.cpp
+++ b/src/Interpreter.cpp
@@ -109,10 +109,8 @@ bool Interpreter::interpret(const std::string& command) {
   std::vector<std::string> words;
   getWords(command, words);
 
-  std::cout << command << "\n";
-
   if (words.empty()) {
-    reportError("Empty command");
+    if (verbose  && 0) reportError("Empty command");
     return false;
   }
 
@@ -122,24 +120,25 @@ bool Interpreter::interpret(const std::string& command) {
   auto iter = mCommands.find(commandName);
 
   if (iter == mCommands.end()) {
-    reportError("Command not found");
-    printHelp();
+    if (verbose  && 0) reportError("Command not found");
+    if (verbose  && 0) printHelp();
     return false;
   }
 
   if (iter->second.numArguments != words.size() - 1) {
-    reportError("Invalid number of arguments given for: " + commandName);
+    if (verbose  && 0) reportError("Invalid number of arguments given for: " + commandName);
     return false;
   }
 
   bool success = iter->second.callback(mFileSystem, words);
 
-  mFileSystem.log();
+  if (verbose && success) std::cout << command << "\n";
+  if (verbose && success) mFileSystem.log();
 
   if (!success) {
-    reportError(FileSystem::getLastError());
+    if (verbose && 0) reportError(FileSystem::getLastError());
     return false;
   }
 
   return true;
-}
\ No newline at end of file
+}
diff --git a/src/Link.cpp b/src/Link.cpp
index 62d0c86..8f18813 100644
--- a/src/Link.cpp
+++ b/src/Link.cpp
@@ -4,16 +4,18 @@
 #include <sstream>
 #include <cassert>
 #include <algorithm>
+#include <iostream>
 
 Link::Link() {}
 
 Link::Link(const Link &node) : Node(node) {
-  mLink = node.mLink;
-  mIsHard = node.mIsHard;
+
 }
 
 std::shared_ptr<Node> Link::clone() const {
-  return std::make_shared<Link>(*this);
+  auto out = std::make_shared<Link>(*this);
+  Link::linkNodes(out, getLink(), isHardLink());
+  return out;
 }
 
 Link::~Link() = default;
@@ -42,7 +44,9 @@ void Link::removeOutgoingLinks() {
   auto& links = isHardLink() ? target->mIncomingHardLinks : target->mIncomingDynamicLinks;
   links.erase(std::remove_if(links.begin(), links.end(), [&](std::weak_ptr<Link>& node){
     auto targetLink = node.lock();
-    return !targetLink || targetLink.get() == this;
+    assert(targetLink);
+    auto res = targetLink.get() == this;
+    return res;
   }), links.end());
 }
 
@@ -62,12 +66,17 @@ std::shared_ptr<Node> Link::getTarget() {
 
 std::shared_ptr<Node> Link::findNode(const std::vector<Key>& path, ui32 currentDepth) {
   assert(path.size() != currentDepth);
-  return getLink()->findNode(path, currentDepth + 1);
+  return getLink()->findNode(path, currentDepth);
 }
 
 void Link::dumpUtil(std::stringstream& ss, const Key& key, ui32 currentDepth, std::vector<bool>& indents) {
   indent(ss, currentDepth, indents);
-  ss << key << (isHardLink() ?  " hlink[" : " dlink[");
+
+  ss << key;
+  ss << (isHardLink() ?  " hlink[" : " dlink[");
+
+  ss << " [h" << mIncomingHardLinks.size() << ": d" << mIncomingDynamicLinks.size() << "] ";
+
   std::vector<std::shared_ptr<Node>> path;
   getNodeStraightPath(getLink(), path);
   std::reverse(path.begin(), path.end());
diff --git a/src/Node.cpp b/src/Node.cpp
index c04adb7..51ae23a 100644
--- a/src/Node.cpp
+++ b/src/Node.cpp
@@ -31,10 +31,14 @@ ui32 Node::getMaxDepth() const {
 }
 
 std::shared_ptr<Node> Node::findNode(const std::vector<Key>& path, ui32 currentDepth) {
-  assert(false);
+  // assert(false);
   return nullptr;
 }
 
+void Node::clearFlags(std::shared_ptr<Node>& directory) {
+  mWorkingNodeFlag = directory;
+}
+
 bool Node::isHardNode() const {
   return std::any_of(mIncomingHardLinks.begin(), mIncomingHardLinks.end(), [this](const std::weak_ptr<Link>& hardLink) {
     auto linkNode = hardLink.lock();
@@ -56,7 +60,7 @@ void Node::removeIncomingDynamicLinks() {
 
     auto linkTarget = linkNode->mWorkingNodeFlag.lock();
     if (linkTarget && ownLink == linkTarget) {
-      continue;
+      // continue;
     }
 
     auto parentNode = linkNode->mParent.lock();
@@ -85,7 +89,7 @@ void Node::dump(std::stringstream& ss) {
 void Node::dumpUtil(std::stringstream& ss, const Key& key, ui32 currentDepth, std::vector<bool>& indents) {
   indent(ss, currentDepth, indents);
   ss << key;
-  // ss << " [file]";
+  ss << " [h" << mIncomingHardLinks.size() << ": d" << mIncomingDynamicLinks.size() << "] ";
   ss << "\n";
 }
 
diff --git a/test/Tests.cpp b/test/Tests.cpp
index ea64817..1fb62ee 100644
--- a/test/Tests.cpp
+++ b/test/Tests.cpp
@@ -1,37 +1,91 @@
 
-#include "Interpreter.hpp"
-#include "UnitTest++/UnitTest++.h"
+#include <iostream>
+#include "Tests.hpp"
+
+SUITE(FSE) {
+  TEST (Simple) {
+    Interpreter interpreter;
+    auto interp = [&](auto name) {
+      interpreter.interpret(name);
+    };
+
+    interp("md a");
+    interp("md a/b");
+    interp("mdl a a/b");
+    interp("copy a C:/");
+    interp("deltree a");
+    interp("deltree a_copy");
+
+    interp("md a");
+    interp("md a/b");
+    interp("mhl a a/b");
+    interp("copy a C:/");
+    interp("deltree a");
+    interp("deltree a_copy");
+    interp("del a/b/a");
+    interp("deltree a");
+
+    interp("md a");
+    interp("md a/b");
+    interp("mdl a a/b");
+    interp("copy a C:/");
+    interp("md c");
+    interp("move a c");
+    interp("move a_copy c");
+
+    interp("copy c C:/");
+
+    interp("deltree c");
+  }
+
+  TEST (CommandNoise) {
+    Interpreter interpreter;
+
+    StringDistribution commands({
+        { "md", 10 },
+        { "mf", 10 },
+        { "mhl", 10 },
+        { "mdl", 10 },
+        { "cd", 5 },
+        { "rd", 1 },
+        { "del", 10 },
+        { "deltree", 10 },
+        { "move", 20 },
+        { "copy", 20 },
+    });
+
+    StringDistribution names({
+        { "C:", 1 },
+        { "a", 1 },
+        { "b", 1 },
+        { "c", 1 },
+        { "d", 1 },
+        { "e", 1 },
+    });
+
+    std::discrete_distribution<int> pathLenDist({ 0.1, 0.2, 0.4, 0.5, 0.1 });
+
+    auto generatePath = [&](std::stringstream& ss) {
+      ss << " ";
+      auto len = pathLenDist(rng);
+      if (len) ss << names.get();
+      for (auto i = 1; i < len; i++) {
+        ss <<"/" << names.get();
+      }
+    };
+
+    runFor(interpreter, timeLimitSec, itemLimit, [&]() {
+      std::stringstream ss;
+      ss << commands.get();
+      generatePath(ss);
+      if (pathLenDist(rng) % 2) generatePath(ss);
+      return ss.str();
+    });
+
+    interpreter.mFileSystem.log();
+  }
+}
 
 int main() {
-  Interpreter interpreter;
-  interpreter.interpret("md a");
-  interpreter.interpret("md a/b");
-  interpreter.interpret("mdl a a/b");
-  interpreter.interpret("copy a C:/");
-  interpreter.interpret("deltree a");
-  interpreter.interpret("deltree a_copy");
-
-
-  interpreter.interpret("md a");
-  interpreter.interpret("md a/b");
-  interpreter.interpret("mhl a a/b");
-  interpreter.interpret("copy a C:/");
-  interpreter.interpret("deltree a");
-  interpreter.interpret("deltree a_copy");
-  interpreter.interpret("del a/b/a");
-  interpreter.interpret("deltree a");
-
-  interpreter.interpret("md a");
-  interpreter.interpret("md a/b");
-  interpreter.interpret("mdl a a/b");
-  interpreter.interpret("copy a C:/");
-  interpreter.interpret("md c");
-  interpreter.interpret("move a c");
-  interpreter.interpret("move a_copy c");
-
-  interpreter.interpret("copy c C:/");
-
-  interpreter.interpret("deltree c");
-
   return UnitTest::RunAllTests();
 }
\ No newline at end of file
diff --git a/test/Tests.hpp b/test/Tests.hpp
new file mode 100644
index 0000000..b3176d3
--- /dev/null
+++ b/test/Tests.hpp
@@ -0,0 +1,47 @@
+
+#pragma once
+
+#include "Interpreter.hpp"
+#include "UnitTest++/UnitTest++.h"
+
+#include <random>
+#include <chrono>
+
+const ui64 timeLimitSec = 5;
+const ui64 itemLimit = 1e6;
+
+std::random_device rd;
+std::mt19937 rng;
+
+class StringDistribution {
+private:
+  std::vector<std::string> commandList;
+  std::vector<double> probabilities;
+  std::discrete_distribution<int> distribution;
+
+public:
+  explicit StringDistribution(const std::map<std::string, double>& commands) {
+    for (const auto& command : commands) {
+      commandList.push_back(command.first);
+      probabilities.push_back(command.second);
+    }
+    double sum = std::accumulate(probabilities.begin(), probabilities.end(), 0.0);
+    std::for_each(probabilities.begin(), probabilities.end(), [sum](double& element) { element /= sum; });
+    distribution = std::discrete_distribution<int>(probabilities.begin(), probabilities.end());
+  }
+
+  std::string get() {
+    return commandList[distribution(rng)];
+  }
+};
+
+template<typename tDriver>
+void runFor(Interpreter& interpreter, ui64 time, ui64 size, tDriver driver) {
+  auto startTime = std::chrono::steady_clock::now();
+  while (true) {
+    auto currentTime = std::chrono::steady_clock::now();
+    double elapsedSeconds = std::chrono::duration<double>(currentTime - startTime).count();
+    if (elapsedSeconds >= (double) time || interpreter.mFileSystem.size() > size) break;
+    interpreter.interpret(driver());
+  }
+}
\ No newline at end of file