diff --git a/platform/platform.pro b/platform/platform.pro
index d05cc1f1e4..c6fb2fd10e 100644
--- a/platform/platform.pro
+++ b/platform/platform.pro
@@ -105,3 +105,4 @@ SOURCES += \
     preferred_languages.cpp \
     servers_list.cpp \
     settings.cpp \
+    socket.cpp \
diff --git a/platform/socket.cpp b/platform/socket.cpp
new file mode 100644
index 0000000000..7e9129d9d6
--- /dev/null
+++ b/platform/socket.cpp
@@ -0,0 +1,91 @@
+#include "socket.hpp"
+
+#include "base/assert.hpp"
+
+#include "std/algorithm.hpp"
+
+namespace platform {
+
+TestSocket::TestSocket()
+  : m_isConnected(false)
+{
+}
+
+TestSocket::~TestSocket()
+{
+  m_isConnected = false;
+}
+
+bool TestSocket::Open(string const & host, uint16_t port)
+{
+  m_isConnected = true;
+  return true;
+}
+
+void TestSocket::Close()
+{
+  m_isConnected = false;
+}
+
+bool TestSocket::Read(uint8_t * data, uint32_t count)
+{
+  if (!m_isConnected)
+    return false;
+
+  lock_guard<mutex> lg(m_inputMutex);
+
+  if (m_input.size() < count)
+    return false;
+
+  copy( m_input.data(), m_input.data()+count, data );
+  m_input.erase( m_input.begin(), m_input.begin() + count );
+  return true;
+}
+
+bool TestSocket::Write(uint8_t const * data, uint32_t count)
+{
+  if (!m_isConnected)
+    return false;
+
+  lock_guard<mutex> lg(m_outputMutex);
+  m_output.insert(m_output.end(), data, data + count);
+  return true;
+}
+
+void TestSocket::SetTimeout(uint32_t milliseconds)
+{
+}
+
+bool TestSocket::HasInput() const
+{
+  lock_guard<mutex> lg(m_inputMutex);
+  return !m_input.empty();
+}
+
+bool TestSocket::HasOutput() const
+{
+  lock_guard<mutex> lg(m_outputMutex);
+  return !m_output.empty();
+}
+
+void TestSocket::AddInput(uint8_t const * data, uint32_t count)
+{
+  ASSERT(m_isConnected, ());
+
+  lock_guard<mutex> lg(m_inputMutex);
+  m_input.insert(m_input.end(), data, data + count);
+}
+
+size_t TestSocket::FetchOutput(vector<uint8_t> & destination)
+{
+  lock_guard<mutex> lg(m_outputMutex);
+
+  size_t const outputSize = m_output.size();
+  if (outputSize == 0)
+    return 0;
+
+  destination.insert(destination.end(), m_output.begin(), m_output.end());
+  m_output.clear();
+  return outputSize;
+}
+} // namespace platform
diff --git a/platform/socket.hpp b/platform/socket.hpp
index 92a7b74d07..3d2e0d2b05 100644
--- a/platform/socket.hpp
+++ b/platform/socket.hpp
@@ -1,31 +1,78 @@
 #pragma once
 
+#include "std/mutex.hpp"
 #include "std/string.hpp"
 #include "std/target_os.hpp"
-
-#if defined(OMIM_OS_IPHONE) || defined(OMIM_OS_MAC)
-@class SocketImpl;
-#else
-class SocketImpl;
-#endif
+#include "std/vector.hpp"
 
 namespace platform
 {
 class Socket
 {
 public:
-  Socket();
-  ~Socket();
+  virtual ~Socket() {}
 
-  bool Open(string const & host, uint16_t port);
-  void Close();
+  virtual bool Open(string const & host, uint16_t port) = 0;
+  virtual void Close() = 0;
 
-  bool Read(uint8_t * data, uint32_t count);
-  bool Write(uint8_t const * data, uint32_t count);
+  virtual bool Read(uint8_t * data, uint32_t count) = 0;
+  virtual bool Write(uint8_t const * data, uint32_t count) = 0;
 
-  void SetTimeout(uint32_t milliseconds);
+  virtual void SetTimeout(uint32_t milliseconds) = 0;
+};
+
+class PlatformSocket final : public Socket
+{
+  PlatformSocket();
+  virtual ~PlatformSocket();
+  virtual bool Open(string const & host, uint16_t port) override;
+  virtual void Close() override;
+  virtual bool Read(uint8_t * data, uint32_t count) override;
+  virtual bool Write(uint8_t const * data, uint32_t count) override;
+  virtual void SetTimeout(uint32_t milliseconds) override;
+};
+
+class MockSocket final : public Socket
+{
+public:
+  virtual bool Open(string const & host, uint16_t port) override { return false; }
+  virtual void Close() override {}
+
+  virtual bool Read(uint8_t * data, uint32_t count) override { return false; }
+  virtual bool Write(uint8_t const * data, uint32_t count) override { return false; }
+
+  virtual void SetTimeout(uint32_t milliseconds) override {}
+};
+
+class TestSocket final : public Socket
+{
+public:
+  TestSocket();
+  virtual ~TestSocket();
+  virtual bool Open(string const & host, uint16_t port) override;
+  virtual void Close() override;
+  virtual bool Read(uint8_t * data, uint32_t count) override;
+  virtual bool Write(uint8_t const * data, uint32_t count) override;
+  virtual void SetTimeout(uint32_t milliseconds) override;
+
+  bool HasInput() const;
+  bool HasOutput() const;
+
+  // Simulate server writing
+  void AddInput(uint8_t const * data, uint32_t count);
+
+  // Simulate server reading
+  // returns size of read data
+  size_t FetchOutput(vector<uint8_t> & destination);
 
 private:
-  SocketImpl * m_socketImpl = nullptr;
+  bool m_isConnected;
+
+  vector<uint8_t> m_input;
+  mutable mutex m_inputMutex;
+
+  vector<uint8_t> m_output;
+  mutable mutex m_outputMutex;
 };
+
 }  // namespace platform
diff --git a/platform/socket_apple.mm b/platform/socket_apple.mm
index 57dd0ebc18..d7abb737f3 100644
--- a/platform/socket_apple.mm
+++ b/platform/socket_apple.mm
@@ -22,22 +22,24 @@
 
 namespace platform
 {
-Socket::Socket() { m_socketImpl = [[SocketImpl alloc] init]; }
-Socket::~Socket()
+PlatformSocket::PlatformSocket() {}
+PlatformSocket::~PlatformSocket()
 {
   Close();
-  m_socketImpl = nil;
 }
 
-bool Socket::Open(string const & host, uint16_t port)
+bool PlatformSocket::Open(string const & host, uint16_t port)
 {
-  return [m_socketImpl open:@(host.c_str()) port:port];
+  return false;
 }
 
-void Socket::Close() { [m_socketImpl close]; }
-bool Socket::Read(uint8_t * data, uint32_t count) { return [m_socketImpl read:data count:count]; }
-bool Socket::Write(uint8_t const * data, uint32_t count)
+void PlatformSocket::Close() {}
+bool PlatformSocket::Read(uint8_t * data, uint32_t count) { return false; }
+bool PlatformSocket::Write(uint8_t const * data, uint32_t count)
+{
+  return false;
+}
+void PlatformSocket::SetTimeout(uint32_t milliseconds)
 {
-  return [m_socketImpl write:data count:count];
 }
 }  // namespace platform