1 files changed, 55 insertions, 0 deletions
diff --git a/spec/models/ci/running_build_spec.rb b/spec/models/ci/running_build_spec.rb
new file mode 100644
index 00000000000..589e5a86f4d
--- /dev/null
+++ b/spec/models/ci/running_build_spec.rb
@@ -0,0 +1,55 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Ci::RunningBuild do
+  let_it_be(:project) { create(:project) }
+  let_it_be(:pipeline) { create(:ci_pipeline, project: project) }
+
+  let(:runner) { create(:ci_runner, :instance_type) }
+  let(:build) { create(:ci_build, :running, runner: runner, pipeline: pipeline) }
+
+  describe '.upsert_shared_runner_build!' do
+    context 'another pending entry does not exist' do
+      it 'creates a new pending entry' do
+        result = described_class.upsert_shared_runner_build!(build)
+
+        expect(result.rows.dig(0, 0)).to eq build.id
+        expect(build.reload.runtime_metadata).to be_present
+      end
+    end
+
+    context 'when another queuing entry exists for given build' do
+      before do
+        described_class.create!(build: build,
+                                project: project,
+                                runner: runner,
+                                runner_type: runner.runner_type)
+      end
+
+      it 'returns a build id as a result' do
+        result = described_class.upsert_shared_runner_build!(build)
+
+        expect(result.rows.dig(0, 0)).to eq build.id
+      end
+    end
+
+    context 'when build has been picked by a specific runner' do
+      let(:runner) { create(:ci_runner, :project) }
+
+      it 'raises an error' do
+        expect { described_class.upsert_shared_runner_build!(build) }
+          .to raise_error(ArgumentError, 'build has not been picked by a shared runner')
+      end
+    end
+
+    context 'when build has not been picked by a runner yet' do
+      let(:build) { create(:ci_build, pipeline: pipeline) }
+
+      it 'raises an error' do
+        expect { described_class.upsert_shared_runner_build!(build) }
+          .to raise_error(ArgumentError, 'build has not been picked by a shared runner')
+      end
+    end
+  end
+end