few fixes and new integration spec -WIP

lib/gitlab/import_export/project_tree_restorer.rb

@@ -66,7 +66,6 @@ module Gitlab
       end
 
       def process_sub_relation(relation_hash, relation_item, sub_relation)
-        sub_relation_object = nil
         if relation_hash.is_a?(Array)
           sub_relation_object = create_relation(sub_relation, relation_hash)
         else

lib/gitlab/import_export/repo_restorer.rb

@@ -14,7 +14,7 @@ module Gitlab
 
         FileUtils.mkdir_p(repos_path)
         FileUtils.mkdir_p(path_to_repo)
-        untar_czf(archive: @path, dir: path_to_repo)
+        untar_zxf(archive: @path, dir: path_to_repo)
       end
 
       private

spec/features/projects/import_export/import_file_spec.rb

@@ -0,0 +1,22 @@
+require 'spec_helper'
+
+feature 'project import', feature: true, js: true do
+  include Select2Helper
+
+  let(:user) { create(:user) }
+  let!(:namespace) { create(:namespace, name: "asd", owner: user) }
+  background do
+    login_as(user)
+  end
+
+  scenario 'user imports an exported project successfully' do
+    visit new_project_path
+
+    select2('asd', from: '#project_namespace_id')
+    fill_in :project_path, with:'test-project-path', visible: true
+    click_link 'GitLab project'
+
+    expect(page).to have_content('GitLab export file')
+    expect(URI.parse(current_url).query).to eq('namespace_id=asd&path=test-project-path')
+  end
+end