1 files changed, 87 insertions, 0 deletions
diff --git a/spec/lib/gitlab/suggestions/commit_message_spec.rb b/spec/lib/gitlab/suggestions/commit_message_spec.rb
new file mode 100644
index 00000000000..0774fc80528
--- /dev/null
+++ b/spec/lib/gitlab/suggestions/commit_message_spec.rb
@@ -0,0 +1,87 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe Gitlab::Suggestions::CommitMessage do
+  def create_suggestion(file_path, new_line, to_content)
+    position = Gitlab::Diff::Position.new(old_path: file_path,
+                                          new_path: file_path,
+                                          old_line: nil,
+                                          new_line: new_line,
+                                          diff_refs: merge_request.diff_refs)
+
+    diff_note = create(:diff_note_on_merge_request,
+                       noteable: merge_request,
+                       position: position,
+                       project: project)
+
+    create(:suggestion,
+           :content_from_repo,
+           note: diff_note,
+           to_content: to_content)
+  end
+
+  let_it_be(:user) do
+    create(:user, :commit_email, name: 'Test User', username: 'test.user')
+  end
+
+  let_it_be(:project) do
+    create(:project, :repository, path: 'project-1', name: 'Project_1')
+  end
+
+  let_it_be(:merge_request) do
+    create(:merge_request, source_project: project, target_project: project)
+  end
+
+  let_it_be(:suggestion_set) do
+    suggestion1 = create_suggestion('files/ruby/popen.rb', 9, '*** SUGGESTION 1 ***')
+    suggestion2 = create_suggestion('files/ruby/popen.rb', 13, '*** SUGGESTION 2 ***')
+    suggestion3 = create_suggestion('files/ruby/regex.rb', 22, '*** SUGGESTION 3 ***')
+
+    Gitlab::Suggestions::SuggestionSet.new([suggestion1, suggestion2, suggestion3])
+  end
+
+  describe '#message' do
+    before do
+      # Updating the suggestion_commit_message on a project shared across specs
+      # avoids recreating the repository for each spec.
+      project.update!(suggestion_commit_message: message)
+    end
+
+    context 'when a custom commit message is not specified' do
+      let(:expected_message) { 'Apply 3 suggestion(s) to 2 file(s)' }
+
+      context 'and is nil' do
+        let(:message) { nil }
+
+        it 'uses the default commit message' do
+          expect(described_class
+                   .new(user, suggestion_set)
+                   .message).to eq(expected_message)
+        end
+      end
+
+      context 'and is an empty string' do
+        let(:message) { '' }
+
+        it 'uses the default commit message' do
+          expect(described_class
+                   .new(user, suggestion_set)
+                   .message).to eq(expected_message)
+        end
+      end
+    end
+
+    context 'is specified and includes all placeholders' do
+      let(:message) do
+        '*** %{branch_name} %{files_count} %{file_paths} %{project_name} %{project_path} %{user_full_name} %{username} %{suggestions_count} ***'
+      end
+
+      it 'generates a custom commit message' do
+        expect(Gitlab::Suggestions::CommitMessage
+                 .new(user, suggestion_set)
+                 .message).to eq('*** master 2 files/ruby/popen.rb, files/ruby/regex.rb Project_1 project-1 Test User test.user 3 ***')
+      end
+    end
+  end
+end