discourse/spec/models/post_spec.rb

require 'rails_helper'
require_dependency 'post_destroyer'

describe Post do
  before { Oneboxer.stubs :onebox }

  describe '#hidden_reasons' do
    context "verify enum sequence" do
      before do
        @hidden_reasons = Post.hidden_reasons
      end

      it "'flag_threshold_reached' should be at 1st position" do
        expect(@hidden_reasons[:flag_threshold_reached]).to eq(1)
      end

      it "'flagged_by_tl3_user' should be at 4th position" do
        expect(@hidden_reasons[:flagged_by_tl3_user]).to eq(4)
      end
    end
  end

  describe '#types' do
    context "verify enum sequence" do
      before do
        @types = Post.types
      end

      it "'regular' should be at 1st position" do
        expect(@types[:regular]).to eq(1)
      end

      it "'whisper' should be at 4th position" do
        expect(@types[:whisper]).to eq(4)
      end
    end
  end

  describe '#cook_methods' do
    context "verify enum sequence" do
      before do
        @cook_methods = Post.cook_methods
      end

      it "'regular' should be at 1st position" do
        expect(@cook_methods[:regular]).to eq(1)
      end

      it "'email' should be at 3rd position" do
        expect(@cook_methods[:email]).to eq(3)
      end
    end
  end

  # Help us build a post with a raw body
  def post_with_body(body, user = nil)
    args = post_args.merge(raw: body)
    args[:user] = user if user.present?
    Fabricate.build(:post, args)
  end

  it { is_expected.to validate_presence_of :raw }

  # Min/max body lengths, respecting padding
  it { is_expected.not_to allow_value("x").for(:raw) }
  it { is_expected.not_to allow_value("x" * (SiteSetting.max_post_length + 1)).for(:raw) }
  it { is_expected.not_to allow_value((" " * SiteSetting.min_post_length) + "x").for(:raw) }

  it { is_expected.to rate_limit }

  let(:topic) { Fabricate(:topic) }
  let(:post_args) do
    { user: topic.user, topic: topic }
  end

  describe 'scopes' do

    describe '#by_newest' do
      it 'returns posts ordered by created_at desc' do
        2.times do |t|
          Fabricate(:post, created_at: t.seconds.from_now)
        end
        expect(Post.by_newest.first.created_at).to be > Post.by_newest.last.created_at
      end
    end

    describe '#with_user' do
      it 'gives you a user' do
        Fabricate(:post, user: Fabricate.build(:user))
        expect(Post.with_user.first.user).to be_a User
      end
    end

  end

  describe "revisions and deleting/recovery" do

    context 'a post without links' do
      let(:post) { Fabricate(:post, post_args) }

      before do
        post.trash!
        post.reload
      end

      it "doesn't create a new revision when deleted" do
        expect(post.revisions.count).to eq(0)
      end

      describe "recovery" do
        before do
          post.recover!
          post.reload
        end

        it "doesn't create a new revision when recovered" do
          expect(post.revisions.count).to eq(0)
        end
      end
    end

    context 'a post with links' do
      let(:post) { Fabricate(:post_with_external_links) }
      before do
        post.trash!
        post.reload
      end

      describe 'recovery' do
        it 'recreates the topic_link records' do
          TopicLink.expects(:extract_from).with(post)
          post.recover!
        end
      end
    end

  end

  describe 'flagging helpers' do
    let(:post) { Fabricate(:post) }
    let(:user) { Fabricate(:coding_horror) }
    let(:admin) { Fabricate(:admin) }

    it 'isFlagged is accurate' do
      PostAction.act(user, post, PostActionType.types[:off_topic])
      post.reload
      expect(post.is_flagged?).to eq(true)

      PostAction.remove_act(user, post, PostActionType.types[:off_topic])
      post.reload
      expect(post.is_flagged?).to eq(false)
    end

    it 'has_active_flag is accurate' do
      PostAction.act(user, post, PostActionType.types[:spam])
      post.reload
      expect(post.has_active_flag?).to eq(true)

      PostAction.defer_flags!(post, admin)
      post.reload
      expect(post.has_active_flag?).to eq(false)
    end
  end

  describe "maximum images" do
    let(:newuser) { Fabricate(:user, trust_level: TrustLevel[0]) }
    let(:post_no_images) { Fabricate.build(:post, post_args.merge(user: newuser)) }
    let(:post_one_image) { post_with_body("![sherlock](http://bbc.co.uk/sherlock.jpg)", newuser) }
    let(:post_two_images) { post_with_body("<img src='http://discourse.org/logo.png'> <img src='http://bbc.co.uk/sherlock.jpg'>", newuser) }
    let(:post_with_avatars) { post_with_body('<img alt="smiley" title=":smiley:" src="/assets/emoji/smiley.png" class="avatar"> <img alt="wink" title=":wink:" src="/assets/emoji/wink.png" class="avatar">', newuser) }
    let(:post_with_favicon) { post_with_body('<img src="/assets/favicons/wikipedia.png" class="favicon">', newuser) }
    let(:post_with_thumbnail) { post_with_body('<img src="/assets/emoji/smiley.png" class="thumbnail">', newuser) }
    let(:post_with_two_classy_images) { post_with_body("<img src='http://discourse.org/logo.png' class='classy'> <img src='http://bbc.co.uk/sherlock.jpg' class='classy'>", newuser) }

    it "returns 0 images for an empty post" do
      expect(Fabricate.build(:post).image_count).to eq(0)
    end

    it "finds images from markdown" do
      expect(post_one_image.image_count).to eq(1)
    end

    it "finds images from HTML" do
      expect(post_two_images.image_count).to eq(2)
    end

    it "doesn't count avatars as images" do
      expect(post_with_avatars.image_count).to eq(0)
    end

    it "doesn't count favicons as images" do
      PrettyText.stubs(:cook).returns(post_with_favicon.raw)
      expect(post_with_favicon.image_count).to eq(0)
    end

    it "doesn't count thumbnails as images" do
      PrettyText.stubs(:cook).returns(post_with_thumbnail.raw)
      expect(post_with_thumbnail.image_count).to eq(0)
    end

    it "doesn't count whitelisted images" do
      Post.stubs(:white_listed_image_classes).returns(["classy"])
      # I dislike this, but passing in a custom whitelist is hard
      PrettyText.stubs(:cook).returns(post_with_two_classy_images.raw)
      expect(post_with_two_classy_images.image_count).to eq(0)
    end

    context "validation" do

      before do
        SiteSetting.newuser_max_images = 1
      end

      context 'newuser' do
        it "allows a new user to post below the limit" do
          expect(post_one_image).to be_valid
        end

        it "doesn't allow more than the maximum" do
          expect(post_two_images).not_to be_valid
        end

        it "doesn't allow a new user to edit their post to insert an image" do
          post_no_images.user.trust_level = TrustLevel[0]
          post_no_images.save
          expect {
            post_no_images.revise(post_no_images.user, raw: post_two_images.raw)
            post_no_images.reload
          }.not_to change(post_no_images, :raw)
        end
      end

      it "allows more images from a not-new account" do
        post_two_images.user.trust_level = TrustLevel[1]
        expect(post_two_images).to be_valid
      end

    end

  end

  describe "maximum attachments" do
    let(:newuser) { Fabricate(:user, trust_level: TrustLevel[0]) }
    let(:post_no_attachments) { Fabricate.build(:post, post_args.merge(user: newuser)) }
    let(:post_one_attachment) { post_with_body('<a class="attachment" href="/uploads/default/1/2082985.txt">file.txt</a>', newuser) }
    let(:post_two_attachments) { post_with_body('<a class="attachment" href="/uploads/default/2/20947092.log">errors.log</a> <a class="attachment" href="/uploads/default/3/283572385.3ds">model.3ds</a>', newuser) }

    it "returns 0 attachments for an empty post" do
      expect(Fabricate.build(:post).attachment_count).to eq(0)
    end

    it "finds attachments from HTML" do
      expect(post_two_attachments.attachment_count).to eq(2)
    end

    context "validation" do

      before do
        SiteSetting.newuser_max_attachments = 1
      end

      context 'newuser' do
        it "allows a new user to post below the limit" do
          expect(post_one_attachment).to be_valid
        end

        it "doesn't allow more than the maximum" do
          expect(post_two_attachments).not_to be_valid
        end

        it "doesn't allow a new user to edit their post to insert an attachment" do
          post_no_attachments.user.trust_level = TrustLevel[0]
          post_no_attachments.save
          expect {
            post_no_attachments.revise(post_no_attachments.user, raw: post_two_attachments.raw)
            post_no_attachments.reload
          }.not_to change(post_no_attachments, :raw)
        end
      end

      it "allows more attachments from a not-new account" do
        post_two_attachments.user.trust_level = TrustLevel[1]
        expect(post_two_attachments).to be_valid
      end

    end

  end

  context "links" do
    let(:newuser) { Fabricate(:user, trust_level: TrustLevel[0]) }
    let(:no_links) { post_with_body("hello world my name is evil trout", newuser) }
    let(:one_link) { post_with_body("[jlawr](http://www.imdb.com/name/nm2225369)", newuser) }
    let(:two_links) { post_with_body("<a href='http://disneyland.disney.go.com/'>disney</a> <a href='http://reddit.com'>reddit</a>", newuser) }
    let(:three_links) { post_with_body("http://discourse.org and http://discourse.org/another_url and http://www.imdb.com/name/nm2225369", newuser) }

    describe "raw_links" do
      it "returns a blank collection for a post with no links" do
        expect(no_links.raw_links).to be_blank
      end

      it "finds a link within markdown" do
        expect(one_link.raw_links).to eq(["http://www.imdb.com/name/nm2225369"])
      end

      it "can find two links from html" do
        expect(two_links.raw_links).to eq(["http://disneyland.disney.go.com/", "http://reddit.com"])
      end

      it "can find three links without markup" do
        expect(three_links.raw_links).to eq(["http://discourse.org", "http://discourse.org/another_url", "http://www.imdb.com/name/nm2225369"])
      end
    end

    describe "linked_hosts" do
      it "returns blank with no links" do
        expect(no_links.linked_hosts).to be_blank
      end

      it "returns the host and a count for links" do
        expect(two_links.linked_hosts).to eq("disneyland.disney.go.com" => 1, "reddit.com" => 1)
      end

      it "it counts properly with more than one link on the same host" do
        expect(three_links.linked_hosts).to eq("discourse.org" => 1, "www.imdb.com" => 1)
      end
    end

    describe "total host usage" do

      it "has none for a regular post" do
        expect(no_links.total_hosts_usage).to be_blank
      end

      context "with a previous host" do

        let(:user) { old_post.newuser }
        let(:another_disney_link) { post_with_body("[radiator springs](http://disneyland.disney.go.com/disney-california-adventure/radiator-springs-racers/)", newuser) }

        before do
          another_disney_link.save
          TopicLink.extract_from(another_disney_link)
        end

        it "contains the new post's links, PLUS the previous one" do
          expect(two_links.total_hosts_usage).to eq('disneyland.disney.go.com' => 2, 'reddit.com' => 1)
        end

      end

    end

  end

  describe "maximum links" do
    let(:newuser) { Fabricate(:user, trust_level: TrustLevel[0]) }
    let(:post_one_link) { post_with_body("[sherlock](http://www.bbc.co.uk/programmes/b018ttws)", newuser) }
    let(:post_two_links) { post_with_body("<a href='http://discourse.org'>discourse</a> <a href='http://twitter.com'>twitter</a>", newuser) }
    let(:post_with_mentions) { post_with_body("hello @#{newuser.username} how are you doing?", newuser) }

    it "returns 0 links for an empty post" do
      expect(Fabricate.build(:post).link_count).to eq(0)
    end

    it "returns 0 links for a post with mentions" do
      expect(post_with_mentions.link_count).to eq(0)
    end

    it "finds links from markdown" do
      expect(post_one_link.link_count).to eq(1)
    end

    it "finds links from HTML" do

      expect(post_two_links.link_count).to eq(2)
    end

    context "validation" do

      before do
        SiteSetting.newuser_max_links = 1
      end

      context 'newuser' do
        it "returns true when within the amount of links allowed" do
          expect(post_one_link).to be_valid
        end

        it "doesn't allow more links than allowed" do
          expect(post_two_links).not_to be_valid
        end
      end

      it "allows multiple images for basic accounts" do
        post_two_links.user.trust_level = TrustLevel[1]
        expect(post_two_links).to be_valid
      end

    end

  end

  describe "@mentions" do

    context 'raw_mentions' do

      it "returns an empty array with no matches" do
        post = Fabricate.build(:post, post_args.merge(raw: "Hello Jake and Finn!"))
        expect(post.raw_mentions).to eq([])
      end

      it "returns lowercase unique versions of the mentions" do
        post = Fabricate.build(:post, post_args.merge(raw: "@Jake @Finn @Jake"))
        expect(post.raw_mentions).to eq(['jake', 'finn'])
      end

      it "ignores pre" do
        # we need to force an inline
        post = Fabricate.build(:post, post_args.merge(raw: "p <pre>@Jake</pre> @Finn"))
        expect(post.raw_mentions).to eq(['finn'])
      end

      it "catches content between pre tags" do
        # per common mark we need to force an inline
        post = Fabricate.build(:post, post_args.merge(raw: "a <pre>hello</pre> @Finn <pre></pre>"))
        expect(post.raw_mentions).to eq(['finn'])
      end

      it "ignores code" do
        post = Fabricate.build(:post, post_args.merge(raw: "@Jake `@Finn`"))
        expect(post.raw_mentions).to eq(['jake'])
      end

      it "ignores quotes" do
        post = Fabricate.build(:post, post_args.merge(raw: "[quote=\"Evil Trout\"]\n@Jake\n[/quote]\n@Finn"))
        expect(post.raw_mentions).to eq(['finn'])
      end

      it "handles underscore in username" do
        post = Fabricate.build(:post, post_args.merge(raw: "@Jake @Finn @Jake_Old"))
        expect(post.raw_mentions).to eq(['jake', 'finn', 'jake_old'])
      end

      it "handles hyphen in groupname" do
        post = Fabricate.build(:post, post_args.merge(raw: "@org-board"))
        expect(post.raw_mentions).to eq(['org-board'])
      end

    end

    context "max mentions" do

      let(:newuser) { Fabricate(:user, trust_level: TrustLevel[0]) }
      let(:post_with_one_mention) { post_with_body("@Jake is the person I'm mentioning", newuser) }
      let(:post_with_two_mentions) { post_with_body("@Jake @Finn are the people I'm mentioning", newuser) }

      context 'new user' do
        before do
          SiteSetting.newuser_max_mentions_per_post = 1
          SiteSetting.max_mentions_per_post = 5
        end

        it "allows a new user to have newuser_max_mentions_per_post mentions" do
          expect(post_with_one_mention).to be_valid
        end

        it "doesn't allow a new user to have more than newuser_max_mentions_per_post mentions" do
          expect(post_with_two_mentions).not_to be_valid
        end
      end

      context "not a new user" do
        before do
          SiteSetting.newuser_max_mentions_per_post = 0
          SiteSetting.max_mentions_per_post = 1
        end

        it "allows vmax_mentions_per_post mentions" do
          post_with_one_mention.user.trust_level = TrustLevel[1]
          expect(post_with_one_mention).to be_valid
        end

        it "doesn't allow to have more than max_mentions_per_post mentions" do
          post_with_two_mentions.user.trust_level = TrustLevel[1]
          expect(post_with_two_mentions).not_to be_valid
        end
      end

    end

  end

  context 'validation' do
    it 'validates our default post' do
      expect(Fabricate.build(:post, post_args)).to be_valid
    end

    it 'create blank posts as invalid' do
      expect(Fabricate.build(:post, raw: "")).not_to be_valid
    end
  end

  context "raw_hash" do

    let(:raw) { "this is our test post body" }
    let(:post) { post_with_body(raw) }

    it "returns a value" do
      expect(post.raw_hash).to be_present
    end

    it "returns blank for a nil body" do
      post.raw = nil
      expect(post.raw_hash).to be_blank
    end

    it "returns the same value for the same raw" do
      expect(post.raw_hash).to eq(post_with_body(raw).raw_hash)
    end

    it "returns a different value for a different raw" do
      expect(post.raw_hash).not_to eq(post_with_body("something else").raw_hash)
    end

    it "returns a different value with different text case" do
      expect(post.raw_hash).not_to eq(post_with_body("THIS is OUR TEST post BODy").raw_hash)
    end
  end

  context 'revise' do

    let(:post) { Fabricate(:post, post_args) }
    let(:first_version_at) { post.last_version_at }

    it 'has no revision' do
      expect(post.revisions.size).to eq(0)
      expect(first_version_at).to be_present
      expect(post.revise(post.user, raw: post.raw)).to eq(false)
    end

    describe 'with the same body' do

      it "doesn't change version" do
        expect { post.revise(post.user, raw: post.raw); post.reload }.not_to change(post, :version)
      end

    end

    describe 'ninja editing & edit windows' do

      before { SiteSetting.editing_grace_period = 1.minute.to_i }

      it 'works' do
        revised_at = post.updated_at + 2.minutes
        new_revised_at = revised_at + 2.minutes

        # ninja edit
        post.revise(post.user, { raw: 'updated body' }, revised_at: post.updated_at + 10.seconds)
        post.reload
        expect(post.version).to eq(1)
        expect(post.public_version).to eq(1)
        expect(post.revisions.size).to eq(0)
        expect(post.last_version_at.to_i).to eq(first_version_at.to_i)

        # revision much later
        post.revise(post.user, { raw: 'another updated body' }, revised_at: revised_at)
        post.reload
        expect(post.version).to eq(2)
        expect(post.public_version).to eq(2)
        expect(post.revisions.size).to eq(1)
        expect(post.last_version_at.to_i).to eq(revised_at.to_i)

        # new edit window
        post.revise(post.user, { raw: 'yet another updated body' }, revised_at: revised_at + 10.seconds)
        post.reload
        expect(post.version).to eq(2)
        expect(post.public_version).to eq(2)
        expect(post.revisions.size).to eq(1)
        expect(post.last_version_at.to_i).to eq(revised_at.to_i)

        # after second window
        post.revise(post.user, { raw: 'yet another, another updated body' }, revised_at: new_revised_at)
        post.reload
        expect(post.version).to eq(3)
        expect(post.public_version).to eq(3)
        expect(post.revisions.size).to eq(2)
        expect(post.last_version_at.to_i).to eq(new_revised_at.to_i)
      end

    end

    describe 'rate limiter' do
      let(:changed_by) { Fabricate(:coding_horror) }

      it "triggers a rate limiter" do
        EditRateLimiter.any_instance.expects(:performed!)
        post.revise(changed_by, raw: 'updated body')
      end
    end

    describe 'with a new body' do
      let(:changed_by) { Fabricate(:coding_horror) }
      let!(:result) { post.revise(changed_by, raw: 'updated body') }

      it 'acts correctly' do
        expect(result).to eq(true)
        expect(post.raw).to eq('updated body')
        expect(post.invalidate_oneboxes).to eq(true)
        expect(post.version).to eq(2)
        expect(post.public_version).to eq(2)
        expect(post.revisions.size).to eq(1)
        expect(post.revisions.first.user).to be_present
      end

      context 'second poster posts again quickly' do

        it 'is a ninja edit, because the second poster posted again quickly' do
          SiteSetting.expects(:editing_grace_period).returns(1.minute.to_i)
          post.revise(changed_by, { raw: 'yet another updated body' }, revised_at: post.updated_at + 10.seconds)
          post.reload

          expect(post.version).to eq(2)
          expect(post.public_version).to eq(2)
          expect(post.revisions.size).to eq(1)
        end

      end

    end

  end

  describe 'before save' do
    let(:cooked) { "<p><div class=\"lightbox-wrapper\"><a data-download-href=\"//localhost:3000/uploads/default/34784374092783e2fef84b8bc96d9b54c11ceea0\" href=\"//localhost:3000/uploads/default/original/1X/34784374092783e2fef84b8bc96d9b54c11ceea0.gif\" class=\"lightbox\" title=\"Sword reworks.gif\"><img src=\"//localhost:3000/uploads/default/optimized/1X/34784374092783e2fef84b8bc96d9b54c11ceea0_1_690x276.gif\" width=\"690\" height=\"276\"><div class=\"meta\">\n<span class=\"filename\">Sword reworks.gif</span><span class=\"informations\">1000x400 1000 KB</span><span class=\"expand\"></span>\n</div></a></div></p>" }

    let(:post) do
      Fabricate(:post,
        raw: "<img src=\"/uploads/default/original/1X/34784374092783e2fef84b8bc96d9b54c11ceea0.gif\" width=\"690\" height=\"276\">",
        cooked: cooked
      )
    end

    it 'should not cook the post if raw has not been changed' do
      post.save!
      expect(post.cooked).to eq(cooked)
    end
  end

  describe 'after save' do

    let(:post) { Fabricate(:post, post_args) }

    it "has correct info set" do
      expect(post.user_deleted?).to eq(false)
      expect(post.post_number).to be_present
      expect(post.excerpt).to be_present
      expect(post.post_type).to eq(Post.types[:regular])
      expect(post.revisions).to be_blank
      expect(post.cooked).to be_present
      expect(post.external_id).to be_present
      expect(post.quote_count).to eq(0)
      expect(post.replies).to be_blank
    end

    describe 'extract_quoted_post_numbers' do

      let!(:post) { Fabricate(:post, post_args) }
      let(:reply) { Fabricate.build(:post, post_args) }

      it "finds the quote when in the same topic" do
        reply.raw = "[quote=\"EvilTrout, post:#{post.post_number}, topic:#{post.topic_id}\"]hello[/quote]"
        reply.extract_quoted_post_numbers
        expect(reply.quoted_post_numbers).to eq([post.post_number])
      end

      it "doesn't find the quote in a different topic" do
        reply.raw = "[quote=\"EvilTrout, post:#{post.post_number}, topic:#{post.topic_id + 1}\"]hello[/quote]"
        reply.extract_quoted_post_numbers
        expect(reply.quoted_post_numbers).to be_blank
      end

    end

    describe 'a new reply' do

      let(:topic) { Fabricate(:topic) }
      let(:other_user) { Fabricate(:coding_horror) }
      let(:reply_text) { "[quote=\"Evil Trout, post:1\"]\nhello\n[/quote]\nHmmm!" }
      let!(:post) { PostCreator.new(topic.user, raw: Fabricate.build(:post).raw, topic_id: topic.id).create }
      let!(:reply) { PostCreator.new(other_user, raw: reply_text, topic_id: topic.id, reply_to_post_number: post.post_number).create }

      it 'has a quote' do
        expect(reply.quote_count).to eq(1)
      end

      it 'has a reply to the user of the original user' do
        expect(reply.reply_to_user).to eq(post.user)
      end

      it 'increases the reply count of the parent' do
        post.reload
        expect(post.reply_count).to eq(1)
      end

      it 'increases the reply count of the topic' do
        topic.reload
        expect(topic.reply_count).to eq(1)
      end

      it 'is the child of the parent post' do
        expect(post.replies).to eq([reply])
      end

      it "doesn't change the post count when you edit the reply" do
        reply.raw = 'updated raw'
        reply.save
        post.reload
        expect(post.reply_count).to eq(1)
      end

      context 'a multi-quote reply' do

        let!(:multi_reply) do
          raw = "[quote=\"Evil Trout, post:1\"]post1 quote[/quote]\nAha!\n[quote=\"Evil Trout, post:2\"]post2 quote[/quote]\nNeat-o"
          PostCreator.new(other_user, raw: raw, topic_id: topic.id, reply_to_post_number: post.post_number).create
        end

        it 'has the correct info set' do
          expect(multi_reply.quote_count).to eq(2)
          expect(post.replies.include?(multi_reply)).to eq(true)
          expect(reply.replies.include?(multi_reply)).to eq(true)
        end
      end

    end

  end

  context 'summary' do
    let!(:p1) { Fabricate(:post, post_args.merge(score: 4, percent_rank: 0.33)) }
    let!(:p2) { Fabricate(:post, post_args.merge(score: 10, percent_rank: 0.66)) }
    let!(:p3) { Fabricate(:post, post_args.merge(score: 5, percent_rank: 0.99)) }

    it "returns the OP and posts above the threshold in summary mode" do
      SiteSetting.summary_percent_filter = 66
      expect(Post.summary.order(:post_number)).to eq([p1, p2])
    end

  end

  context 'sort_order' do
    context 'regular topic' do

      let!(:p1) { Fabricate(:post, post_args) }
      let!(:p2) { Fabricate(:post, post_args) }
      let!(:p3) { Fabricate(:post, post_args) }

      it 'defaults to created order' do
        expect(Post.regular_order).to eq([p1, p2, p3])
      end
    end
  end

  context "reply_history" do

    let!(:p1) { Fabricate(:post, post_args) }
    let!(:p2) { Fabricate(:post, post_args.merge(reply_to_post_number: p1.post_number)) }
    let!(:p3) { Fabricate(:post, post_args) }
    let!(:p4) { Fabricate(:post, post_args.merge(reply_to_post_number: p2.post_number)) }

    it "returns the posts in reply to this post" do
      expect(p4.reply_history).to eq([p1, p2])
      expect(p4.reply_history(1)).to eq([p2])
      expect(p3.reply_history).to be_blank
      expect(p2.reply_history).to eq([p1])
    end

  end

  context "reply_ids" do

    let!(:topic) { Fabricate(:topic) }
    let!(:p1) { Fabricate(:post, topic: topic, post_number: 1) }
    let!(:p2) { Fabricate(:post, topic: topic, post_number: 2, reply_to_post_number: 1) }
    let!(:p3) { Fabricate(:post, topic: topic, post_number: 3) }
    let!(:p4) { Fabricate(:post, topic: topic, post_number: 4, reply_to_post_number: 2) }
    let!(:p5) { Fabricate(:post, topic: topic, post_number: 5, reply_to_post_number: 4) }
    let!(:p6) { Fabricate(:post, topic: topic, post_number: 6) }

    before {
      PostReply.create!(post: p1, reply: p2)
      PostReply.create!(post: p2, reply: p4)
      PostReply.create!(post: p2, reply: p6) # simulates p6 quoting p2
      PostReply.create!(post: p3, reply: p5) # simulates p5 quoting p3
      PostReply.create!(post: p4, reply: p5)
      PostReply.create!(post: p6, reply: p6) # https://meta.discourse.org/t/topic-quoting-itself-displays-reply-indicator/76085
    }

    it "returns the reply ids and their level" do
      expect(p1.reply_ids).to eq([{ id: p2.id, level: 1 }, { id: p4.id, level: 2 }, { id: p6.id, level: 2 }])
      expect(p2.reply_ids).to eq([{ id: p4.id, level: 1 }, { id: p6.id, level: 1 }])
      expect(p3.reply_ids).to be_empty # has no replies
      expect(p4.reply_ids).to be_empty # p5 replies to 2 posts (p4 and p3)
      expect(p5.reply_ids).to be_empty # has no replies
      expect(p6.reply_ids).to be_empty # quotes itself
    end

  end

  describe 'urls' do
    it 'no-ops for empty list' do
      expect(Post.urls([])).to eq({})
    end

    # integration test -> should move to centralized integration test
    it 'finds urls for posts presented' do
      p1 = Fabricate(:post)
      p2 = Fabricate(:post)
      expect(Post.urls([p1.id, p2.id])).to eq(p1.id => p1.url, p2.id => p2.url)
    end
  end

  describe "details" do
    it "adds details" do
      post = Fabricate.build(:post)
      post.add_detail("key", "value")
      expect(post.post_details.size).to eq(1)
      expect(post.post_details.first.key).to eq("key")
      expect(post.post_details.first.value).to eq("value")
    end

    it "can find a post by a detail" do
      detail = Fabricate(:post_detail)
      post   = detail.post
      expect(Post.find_by_detail(detail.key, detail.value).id).to eq(post.id)
    end
  end

  describe "cooking" do
    let(:post) { Fabricate.build(:post, post_args.merge(raw: "please read my blog http://blog.example.com")) }

    it "should add nofollow to links in the post for trust levels below 3" do
      post.user.trust_level = 2
      post.save
      expect(post.cooked).to match(/nofollow noopener/)
    end

    it "when tl3_links_no_follow is false, should not add nofollow for trust level 3 and higher" do
      SiteSetting.tl3_links_no_follow = false
      post.user.trust_level = 3
      post.save
      expect(post.cooked).not_to match(/nofollow/)
    end

    it "when tl3_links_no_follow is true, should add nofollow for trust level 3 and higher" do
      SiteSetting.tl3_links_no_follow = true
      post.user.trust_level = 3
      post.save
      expect(post.cooked).to match(/nofollow noopener/)
    end
  end

  describe "calculate_avg_time" do

    it "should not crash" do
      Post.calculate_avg_time
      Post.calculate_avg_time(1.day.ago)
    end
  end

  describe "has_host_spam" do
    let(:raw) { "hello from my site http://www.somesite.com http://#{GlobalSetting.hostname} http://#{RailsMultisite::ConnectionManagement.current_hostname}" }

    it "correctly detects host spam" do
      post = Fabricate(:post, raw: raw)

      expect(post.total_hosts_usage).to eq("www.somesite.com" => 1)
      post.acting_user.trust_level = 0

      expect(post.has_host_spam?).to eq(false)

      SiteSetting.newuser_spam_host_threshold = 1

      expect(post.has_host_spam?).to eq(true)

      SiteSetting.white_listed_spam_host_domains = "bla.com|boo.com | somesite.com "
      expect(post.has_host_spam?).to eq(false)
    end

    it "doesn't punish staged users" do
      SiteSetting.newuser_spam_host_threshold = 1
      user = Fabricate(:user, staged: true, trust_level: 0)
      post = Fabricate(:post, raw: raw, user: user)
      expect(post.has_host_spam?).to eq(false)
    end

    it "ignores private messages" do
      SiteSetting.newuser_spam_host_threshold = 1
      user = Fabricate(:user, trust_level: 0)
      post = Fabricate(:post, raw: raw, user: user, topic: Fabricate(:private_message_topic, user: user))
      expect(post.has_host_spam?).to eq(false)
    end
  end

  it "has custom fields" do
    post = Fabricate(:post)
    expect(post.custom_fields["a"]).to eq(nil)

    post.custom_fields["Tommy"] = "Hanks"
    post.custom_fields["Vincent"] = "Vega"
    post.save

    post = Post.find(post.id)
    expect(post.custom_fields).to eq("Tommy" => "Hanks", "Vincent" => "Vega")
  end

  describe "#rebake!" do
    it "will rebake a post correctly" do
      post = create_post
      expect(post.baked_at).not_to eq(nil)
      first_baked = post.baked_at
      first_cooked = post.cooked

      Post.exec_sql("UPDATE posts SET cooked = 'frogs' WHERE id = ?", post.id)
      post.reload

      post.expects(:publish_change_to_clients!).with(:rebaked)

      result = post.rebake!

      expect(post.baked_at).not_to eq(first_baked)
      expect(post.cooked).to eq(first_cooked)
      expect(result).to eq(true)
    end
  end

  describe "#set_owner" do
    let(:post) { Fabricate(:post) }
    let(:coding_horror) { Fabricate(:coding_horror) }

    it "will change owner of a post correctly" do
      post.set_owner(coding_horror, Discourse.system_user)
      post.reload

      expect(post.user).to eq(coding_horror)
      expect(post.revisions.size).to eq(1)
    end

    it "skips creating new post revision if skip_revision is true" do
      post.set_owner(coding_horror, Discourse.system_user, true)
      post.reload

      expect(post.user).to eq(coding_horror)
      expect(post.revisions.size).to eq(0)
    end

    it "uses default locale for edit reason" do
      I18n.locale = 'de'
      old_username = post.user.username_lower

      post.set_owner(coding_horror, Discourse.system_user)
      post.reload

      expected_reason = I18n.with_locale(SiteSetting.default_locale) do
        I18n.t('change_owner.post_revision_text',
               old_user: old_username,
               new_user: coding_horror.username_lower
        )
      end

      expect(post.edit_reason).to eq(expected_reason)
    end
  end

  describe ".rebake_old" do
    it "will catch posts it needs to rebake" do
      post = create_post
      post.update_columns(baked_at: Time.new(2000, 1, 1), baked_version: -1)
      Post.rebake_old(100)

      post.reload
      expect(post.baked_at).to be > 1.day.ago

      baked = post.baked_at
      Post.rebake_old(100)
      post.reload
      expect(post.baked_at).to eq(baked)
    end
  end

  describe ".unhide!" do
    before { SiteSetting.unique_posts_mins = 5 }

    it "will unhide the first post & make the topic visible" do
      hidden_topic = Fabricate(:topic, visible: false)

      post = create_post(topic: hidden_topic)
      post.update_columns(hidden: true, hidden_at: Time.now, hidden_reason_id: 1)
      post.reload

      expect(post.hidden).to eq(true)

      post.expects(:publish_change_to_clients!).with(:acted)

      post.unhide!

      post.reload
      hidden_topic.reload

      expect(post.hidden).to eq(false)
      expect(hidden_topic.visible).to eq(true)
    end
  end

  it "will unhide the post but will keep the topic invisible/unlisted" do
    hidden_topic = Fabricate(:topic, visible: false)
    create_post(topic: hidden_topic)
    second_post = create_post(topic: hidden_topic)

    second_post.update_columns(hidden: true, hidden_at: Time.now, hidden_reason_id: 1)
    second_post.expects(:publish_change_to_clients!).with(:acted)

    second_post.unhide!

    second_post.reload
    hidden_topic.reload

    expect(second_post.hidden).to eq(false)
    expect(hidden_topic.visible).to eq(false)
  end

end