rspec: getting failure/error while redirecting to index action

Question

I am new to rspec. I am getting failure message as shown below:

Failures:

 1) PostsController PUT update it success when update a post
     Failure/Error: expect(response).to redirect_to(posts_url)
       Expected response to be a <redirect>, but was <200>
     # ./spec/controllers/posts_controller_spec.rb:11:in `block (3 levels) in <top (required)>'

Finished in 0.24448 seconds
1 example, 1 failure

Failed examples:

rspec ./spec/controllers/posts_controller_spec.rb:8 # PostsController PUT update it success when update a post

I have following codes in posts_controller_spec.rb

require 'spec_helper'

describe PostsController do

  describe "PUT update" do
    let(:post) {FactoryGirl.create(:post)}

    it "it success when update a post" do
      @post = FactoryGirl.create(:post, :title => "my title", :content => "my content")
      expect {put :update, :id => @post.id }
      // put :update, { :id => @post.id, :post => { "title" => "MyString", :content => "my content" } }
      expect(response).to redirect_to(posts_url)
    end
  end
end

I got many solutions, but did not get success.

I am getting issue in this line

  expect(response).to redirect_to(posts_url)

I tried below code as well

specify { expect(response).to redirect_to(posts_path) }

FYI I have added below codes to my spec_helper.rb

 RSpec.configure do |config|

  config.mock_with :rspec do |c|
    c.syntax = [:should, :expect]
  end
  config.expect_with :rspec do |c|
    c.syntax = [:should, :expect]
  end

Any suggestion would be much appreciated.

posts_controller.rb is something like this.

    class PostsController < ApplicationController
        def edit
          @post = Post.find(params[:id]
        end

        def update
         @post = Post.find(params[:id])
         if @post.update_attributes(post_params)
           redirect_to posts_path
         else
           render :action => :edit
         end
        end

        def index
          @posts = Post.all
        end

        private
         def post_params
          params.require(post).permit!
         end
    end

My post model:

class Post < ActiveRecord::Base
  validates :title, :content, :presence => true
end

Answer 1

According your controller, @post never updated because post_params empty, so update action render edit template with status 200.

Try change your it block to update @post variable(this is just example):

it "it success when update a post" do
  @post = FactoryGirl.create(:post, :title => "my title", :content => "my content", :id => 3)
  put :update, :id => @post.id, FactoryGirl.attributes_for(:post)
  expect(response).to redirect_to(posts_url)
end