diff --git a/Gemfile b/Gemfile
index 53812ac36..e5475f7e3 100644
--- a/Gemfile
+++ b/Gemfile
@@ -125,6 +125,7 @@ group :test do
   gem 'shoulda'
   gem 'shoulda-matchers'
   gem 'mock_redis',         '~> 0.11'
+  gem 'webmock'
   gem 'rake'
   gem 'test_after_commit'
   gem 'timecop'
diff --git a/Gemfile.lock b/Gemfile.lock
index bbcc0f646..f7fb70257 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -76,6 +76,7 @@ GEM
       multi_json (~> 1.3)
       thread_safe (~> 0.1)
       tzinfo (~> 0.3.37)
+    addressable (2.3.6)
     airbrake (3.1.16)
       builder
       multi_json
@@ -137,6 +138,8 @@ GEM
       sass (= 3.2.14)
     compass-rails (1.1.6)
       compass (>= 0.12.2)
+    crack (0.4.2)
+      safe_yaml (~> 1.0.0)
     creole (0.5.0)
     daemons (1.1.9)
     debug_inspector (0.0.2)
@@ -418,6 +421,7 @@ GEM
       i18n (>= 0.5.0)
     rvm-capistrano (1.5.1)
       capistrano (~> 2.15.4)
+    safe_yaml (1.0.3)
     sanitize (2.0.6)
       nokogiri (>= 1.4.4)
     sass (3.2.14)
@@ -493,6 +497,9 @@ GEM
       rack (>= 1.0.0)
     warden (1.2.3)
       rack (>= 1.0)
+    webmock (1.18.0)
+      addressable (>= 2.3.6)
+      crack (>= 0.3.2)
     whenever (0.9.2)
       activesupport (>= 2.3.4)
       chronic (>= 0.6.3)
@@ -598,6 +605,7 @@ DEPENDENCIES
   timecop
   uglifier (~> 2.4)
   underscore-rails
+  webmock
   whenever (~> 0.9.0)
   wikicloth
   will_paginate (~> 3.0.5)
diff --git a/app/services/file_store_service.rb b/app/services/file_store_service.rb
index ba812a486..f25411d51 100644
--- a/app/services/file_store_service.rb
+++ b/app/services/file_store_service.rb
@@ -3,14 +3,14 @@ module FileStoreService
 
     URL = APP_CONFIG['file_store_url']
 
-    attr_accessor :sha1, :file
+    attr_accessor :sha1, :data
 
     # @param [String] sha1
     # @param [Hash] data:
     # - [String] path     - path to file
     # - [String] fullname - file name
     def initialize(sha1: nil, data: {})
-      @sha1, @file = sha1, file
+      @sha1, @data = sha1, data
     end
 
     def exist?
@@ -25,11 +25,11 @@ module FileStoreService
     end
 
     def save
-      sha1 = Digest::SHA1.hexdigest(File.read(data[:path]))
+      sha1 = Digest::SHA1.hexdigest(::File.read(data[:path]))
       return sha1 if exist?
 
       resource  = RestClient::Resource.new("#{URL}/api/v1/upload", user: token)
-      file      = File.new(data[:path])
+      file      = ::File.new(data[:path])
       # Hook for RestClient
       # See: [RestClient::Payload#create_file_field](https://github.com/rest-client/rest-client/blob/master/lib/restclient/payload.rb#L202-L215)
       file.define_singleton_method(:original_filename) { data[:fullname] }
diff --git a/spec/services/file_store_service_spec.rb b/spec/services/file_store_service_spec.rb
new file mode 100644
index 000000000..d7f781926
--- /dev/null
+++ b/spec/services/file_store_service_spec.rb
@@ -0,0 +1,82 @@
+require 'spec_helper'
+
+describe FileStoreService::File do
+
+  let(:sha1) { 'test-sha1' }
+
+  context '#exist?' do
+    let(:response)  { [ { file_name: 'test.log', sha1_hash: sha1 } ].to_json }
+    let(:url)       { "http://file-store.rosalinux.ru/api/v1/file_stores.json?hash=#{sha1}" }
+
+    subject { FileStoreService::File.new(sha1: sha1) }
+
+    it 'returns true if file exists' do
+      stub_request(:get, url).to_return(body: response)
+      expect(subject.exist?).to be_true
+    end
+
+    it 'returns false if file does not exist' do
+      stub_request(:get, url).to_return(body: '[]')
+      expect(subject.exist?).to be_false
+    end
+
+    it 'returns false on error' do
+      stub_request(:get, url).to_raise(StandardError)
+      expect(subject.exist?).to be_false
+    end
+  end
+
+  context '#save' do
+    let(:data) { { path: 'test-path', fullname: 'test-fullname' } }
+    let(:file) { double(:file) }
+
+    before do
+      allow(Digest::SHA1).to receive(:hexdigest).and_return(sha1)
+      allow(File).to receive(:read).and_return(file)
+    end
+
+    subject { FileStoreService::File.new(data: data) }
+
+    it 'returns sha1 if file already exists on FS' do
+      allow(subject).to receive(:exist?).and_return(true)
+      expect(subject.save).to eq sha1
+    end
+
+    context 'file does not exist on FS' do
+      let(:url) { "http://test-token:@file-store.rosalinux.ru/api/v1/upload" }
+      let(:response)  { { sha1_hash: sha1 }.to_json }
+
+      before do
+        allow(subject).to receive(:exist?).and_return(false)
+        allow(File).to receive(:new).and_return(file)
+        allow(subject).to receive(:token).and_return('test-token')
+      end
+
+      it 'returns sha1 if response code - 422' do
+        stub_request(:post, url).to_raise(RestClient::UnprocessableEntity)
+        expect(subject.save).to eq sha1
+      end
+
+      it 'returns nil on error' do
+        stub_request(:post, url).to_raise(StandardError)
+        expect(subject.save).to be_nil
+      end
+
+      it 'returns sha1 on success' do
+        stub_request(:post, url).to_return(body: response)
+        expect(subject.save).to eq sha1
+      end
+    end
+  end
+
+  context '#destroy' do
+    let(:url) { "http://file-store.rosalinux.ru/api/v1/file_stores/#{sha1}.json" }
+
+    it 'not raise errors' do
+      stub_request(:delete, url).to_raise(StandardError)
+      expect {subject.destroy }.to_not raise_error
+    end
+
+  end
+
+end
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index dcae6ef9d..daa2a7cc8 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -2,6 +2,7 @@
 ENV["RAILS_ENV"] ||= 'test'
 require File.expand_path("../../config/environment", __FILE__)
 require 'rspec/rails'
+require 'webmock/rspec'
 
 # Requires supporting ruby files with custom matchers and macros, etc,
 # in spec/support/ and its subdirectories.