Convert TestHookContext into TestHookService. Added tests

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/contexts/test_hook_context.rb

-class TestHookContext < BaseContext
-  def execute
-    hook = project.hooks.find(params[:id])
-    data = GitPushService.new.sample_data(project, current_user)
-    hook.execute(data)
-  end
-end

app/controllers/projects/hooks_controller.rb

@@ -24,15 +24,20 @@ class Projects::HooksController < Projects::ApplicationController
   end
   def test
-    TestHookContext.new(project, current_user, params).execute
+    TestHookService.new.execute(hook, current_user)
     redirect_to :back
   end
   def destroy
-    @hook = @project.hooks.find(params[:id])
-    @hook.destroy
+    hook.destroy
     redirect_to project_hooks_path(@project)
   end
+
+  private
+
+  def hook
+    @hook ||= @project.hooks.find(params[:id])
+  end
 end

app/services/test_hook_service.rb

+class TestHookService
+  def execute(hook, current_user)
+    data = GitPushService.new.sample_data(hook.project, current_user)
+    hook.execute(data)
+  end
+end

spec/services/test_hook_service_spec.rb

+require 'spec_helper'
+
+describe TestHookService do
+  let (:user)    { create :user }
+  let (:project) { create :project_with_code }
+  let (:hook)    { create :project_hook, project: project }
+
+  describe :execute do
+    it "should execute successfully" do
+      stub_request(:post, hook.url).to_return(status: 200)
+      TestHookService.new.execute(hook, user).should be_true
+    end
+  end
+end