Add API specs for cherry-pick and revert dry-run

spec/requests/api/commits_spec.rb

@@ -1462,6 +1462,16 @@ RSpec.describe API::Commits do
           expect(json_response['author_name']).to eq(commit.author_name)
           expect(json_response['committer_name']).to eq(user.name)
         end
+
+        it 'supports dry-run without applying changes' do
+          head = project.commit(branch)
+
+          post api(route, current_user), params: { branch: branch, dry_run: true }
+
+          expect(response).to have_gitlab_http_status(:no_content)
+          expect(response.body).to be_empty
+          expect(project.commit(branch)).to eq(head)
+        end
       end
 
       context 'when repository is disabled' do
@@ -1623,6 +1633,16 @@ RSpec.describe API::Commits do
           expect(json_response['committer_name']).to eq(user.name)
           expect(json_response['parent_ids']).to contain_exactly(commit_id)
         end
+
+        it 'supports dry-run without applying changes' do
+          head = project.commit(branch)
+
+          post api(route, current_user), params: { branch: branch, dry_run: true }
+
+          expect(response).to have_gitlab_http_status(:no_content)
+          expect(response.body).to be_empty
+          expect(project.commit(branch)).to eq(head)
+        end
       end
 
       context 'when repository is disabled' do