1 files changed, 74 insertions, 0 deletions
diff --git a/spec/services/repositories/changelog_service_spec.rb b/spec/services/repositories/changelog_service_spec.rb
new file mode 100644
index 00000000000..1ecf45bcd16
--- /dev/null
+++ b/spec/services/repositories/changelog_service_spec.rb
@@ -0,0 +1,74 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Repositories::ChangelogService do
+  describe '#execute' do
+    it 'generates and commits a changelog section' do
+      project = create(:project, :empty_repo)
+      creator = project.creator
+      author1 = create(:user)
+      author2 = create(:user)
+
+      project.add_maintainer(author1)
+      project.add_maintainer(author2)
+
+      mr1 = create(:merge_request, :merged, target_project: project)
+      mr2 = create(:merge_request, :merged, target_project: project)
+
+      # The range of commits ignores the first commit, but includes the last
+      # commit. To ensure both the commits below are included, we must create an
+      # extra commit.
+      #
+      # In the real world, the start commit of the range will be the last commit
+      # of the previous release, so ignoring that is expected and desired.
+      sha1 = create_commit(
+        project,
+        creator,
+        commit_message: 'Initial commit',
+        actions: [{ action: 'create', content: 'test', file_path: 'README.md' }]
+      )
+
+      sha2 = create_commit(
+        project,
+        author1,
+        commit_message: "Title 1\n\nChangelog: feature",
+        actions: [{ action: 'create', content: 'foo', file_path: 'a.txt' }]
+      )
+
+      sha3 = create_commit(
+        project,
+        author2,
+        commit_message: "Title 2\n\nChangelog: feature",
+        actions: [{ action: 'create', content: 'bar', file_path: 'b.txt' }]
+      )
+
+      commit1 = project.commit(sha2)
+      commit2 = project.commit(sha3)
+
+      allow(MergeRequestDiffCommit)
+        .to receive(:oldest_merge_request_id_per_commit)
+        .with(project.id, [commit2.id, commit1.id])
+        .and_return([
+          { sha: sha2, merge_request_id: mr1.id },
+          { sha: sha3, merge_request_id: mr2.id }
+        ])
+
+      recorder = ActiveRecord::QueryRecorder.new do
+        described_class
+          .new(project, creator, version: '1.0.0', from: sha1, to: sha3)
+          .execute
+      end
+
+      changelog = project.repository.blob_at('master', 'CHANGELOG.md')&.data
+
+      expect(recorder.count).to eq(10)
+      expect(changelog).to include('Title 1', 'Title 2')
+    end
+  end
+
+  def create_commit(project, user, params)
+    params = { start_branch: 'master', branch_name: 'master' }.merge(params)
+    Files::MultiService.new(project, user, params).execute.fetch(:result)
+  end
+end