Add CHANGELOG item and tests

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

CHANGELOG

@@ -23,6 +23,7 @@ v 8.4.0 (unreleased)
   - Validate README format before displaying
   - Enable Microsoft Azure OAuth2 support (Janis Meybohm)
   - Add file finder feature in tree view (koreamic)
+  - Ajax filter by message for commits page
 v 8.3.3 (unreleased)
   - Get "Merge when build succeeds" to work when commits were pushed to MR target branch while builds were running

features/project/commits/commits.feature

@@ -55,3 +55,8 @@ Feature: Project Commits
   Scenario: I browse a commit with an image
     Given I visit a commit with an image that changed
     Then The diff links to both the previous and current image
+
+  @javascript
+  Scenario: I filter commits by message
+    When I search "submodules" commits
+    Then I should see only "submodules" commits

features/steps/project/commits/commits.rb

@@ -124,4 +124,13 @@ class Spinach::Features::ProjectCommits < Spinach::FeatureSteps
     expect(page).to have_content "build: pending"
     expect(page).to have_content "1 build"
   end
+
+  step 'I search "submodules" commits' do
+    fill_in 'commits-search', with: 'submodules'
+  end
+
+  step 'I should see only "submodules" commits' do
+    expect(page).to have_content "More submodules"
+    expect(page).not_to have_content "Change some files"
+  end
 end