Speed up features/notes_on_merge_requests_spec

This spec featured the slowest tests in the entire suite. After some
debugging, the cause was found to be the large commit diff generated by
comparing the stable and master branches.

To fix this, the seed repository was modified to create a simple branch
off of master that consists of three simple commits and minor changes.
The spec was then updated to compare master to this branch instead of
stable. The result is a spec group that runs in under 30 seconds, down
from about 90.

spec/factories.rb

@@ -146,6 +146,11 @@ FactoryGirl.define do
       state :reopened
     end
+    trait :simple do
+      source_branch "simple_merge_request"
+      target_branch "master"
+    end
+
     factory :closed_merge_request, traits: [:closed]
     factory :reopened_merge_request, traits: [:reopened]
     factory :merge_request_with_diffs, traits: [:with_diffs]
@@ -161,7 +166,6 @@ FactoryGirl.define do
     factory :note_on_issue, traits: [:on_issue], aliases: [:votable_note]
     factory :note_on_merge_request, traits: [:on_merge_request]
     factory :note_on_merge_request_diff, traits: [:on_merge_request, :on_diff]
-    factory :note_on_merge_request_with_attachment, traits: [:on_merge_request, :with_attachment]
     trait :on_commit do
       project factory: :project

spec/features/notes_on_merge_requests_spec.rb

 require 'spec_helper'
 describe "On a merge request", js: true do
-  let!(:project) { create(:project) }
-  let!(:merge_request) { create(:merge_request, source_project: project, target_project: project) }
-  let!(:note) { create(:note_on_merge_request_with_attachment,  project: project) }
+  let!(:merge_request) { create(:merge_request, :simple) }
+  let!(:project) { merge_request.source_project }
+  let!(:note) { create(:note_on_merge_request, :with_attachment, project: project) }
   before do
-    login_as :user
-    project.team << [@user, :master]
-
+    login_as :admin
     visit project_merge_request_path(project, merge_request)
   end
@@ -134,22 +132,20 @@ describe "On a merge request", js: true do
   end
 end
-describe "On a merge request diff", js: true, focus: true do
-  let!(:project) { create(:project) }
-  let!(:merge_request) { create(:merge_request_with_diffs, source_project: project, target_project: project) }
+describe "On a merge request diff", js: true do
+  let(:merge_request) { create(:merge_request, :with_diffs, :simple) }
+  let(:project) { merge_request.source_project }
   before do
-    login_as :user
-    project.team << [@user, :master]
+    login_as :admin
     visit diffs_project_merge_request_path(project, merge_request)
   end
-
   subject { page }
   describe "when adding a note" do
     before do
-      find('a[data-line-code="4735dfc552ad7bf15ca468adc3cad9d05b624490_172_185"]').click
+      find('a[data-line-code="8ec9a00bfd09b3190ac6b22251dbb1aa95a0579d_7_7"]').click
     end
     describe "the notes holder" do
@@ -160,13 +156,13 @@ describe "On a merge request diff", js: true, focus: true do
     describe "the note form" do
       it "shouldn't add a second form for same row" do
-        find('a[data-line-code="4735dfc552ad7bf15ca468adc3cad9d05b624490_172_185"]').click
-        should have_css("tr[id='4735dfc552ad7bf15ca468adc3cad9d05b624490_172_185'] + .js-temp-notes-holder form", count: 1)
+        find('a[data-line-code="8ec9a00bfd09b3190ac6b22251dbb1aa95a0579d_7_7"]').click
+        should have_css("tr[id='8ec9a00bfd09b3190ac6b22251dbb1aa95a0579d_7_7'] + .js-temp-notes-holder form", count: 1)
       end
       it "should be removed when canceled" do
-        within(".diff-file form[rel$='4735dfc552ad7bf15ca468adc3cad9d05b624490_172_185']") do
+        within(".diff-file form[rel$='8ec9a00bfd09b3190ac6b22251dbb1aa95a0579d_7_7']") do
           find(".js-close-discussion-note-form").trigger("click")
         end
@@ -176,12 +172,9 @@ describe "On a merge request diff", js: true, focus: true do
   end
   describe "with muliple note forms" do
-    let!(:project) { create(:project) }
-    let!(:merge_request) { create(:merge_request_with_diffs, source_project: project, target_project: project) }
-
     before do
-      find('a[data-line-code="4735dfc552ad7bf15ca468adc3cad9d05b624490_172_185"]').click
-      find('a[data-line-code="342e16cbbd482ac2047dc679b2749d248cc1428f_18_17"]').click
+      find('a[data-line-code="8ec9a00bfd09b3190ac6b22251dbb1aa95a0579d_7_7"]').click
+      find('a[data-line-code="8ec9a00bfd09b3190ac6b22251dbb1aa95a0579d_10_10"]').click
     end
     it { should have_css(".js-temp-notes-holder", count: 2) }
@@ -189,12 +182,12 @@ describe "On a merge request diff", js: true, focus: true do
     describe "previewing them separately" do
       before do
         # add two separate texts and trigger previews on both
-        within("tr[id='4735dfc552ad7bf15ca468adc3cad9d05b624490_172_185'] + .js-temp-notes-holder") do
-          fill_in "note[note]", with: "One comment on line 185"
+        within("tr[id='8ec9a00bfd09b3190ac6b22251dbb1aa95a0579d_7_7'] + .js-temp-notes-holder") do
+          fill_in "note[note]", with: "One comment on line 7"
           find(".js-note-preview-button").trigger("click")
         end
-        within("tr[id='342e16cbbd482ac2047dc679b2749d248cc1428f_18_17'] + .js-temp-notes-holder") do
-          fill_in "note[note]", with: "Another comment on line 17"
+        within("tr[id='8ec9a00bfd09b3190ac6b22251dbb1aa95a0579d_10_10'] + .js-temp-notes-holder") do
+          fill_in "note[note]", with: "Another comment on line 10"
           find(".js-note-preview-button").trigger("click")
         end
       end
@@ -202,14 +195,14 @@ describe "On a merge request diff", js: true, focus: true do
     describe "posting a note" do
       before do
-        within("tr[id='342e16cbbd482ac2047dc679b2749d248cc1428f_18_17'] + .js-temp-notes-holder") do
-          fill_in "note[note]", with: "Another comment on line 17"
+        within("tr[id='8ec9a00bfd09b3190ac6b22251dbb1aa95a0579d_10_10'] + .js-temp-notes-holder") do
+          fill_in "note[note]", with: "Another comment on line 10"
           click_button("Add Comment")
         end
       end
       it 'should be added as discussion' do
-        should have_content("Another comment on line 17")
+        should have_content("Another comment on line 10")
         should have_css(".notes_holder")
         should have_css(".notes_holder .note", count: 1)
         should have_link("Reply")