1 files changed, 33 insertions, 1 deletions
diff --git a/spec/lib/gitlab/metrics/background_transaction_spec.rb b/spec/lib/gitlab/metrics/background_transaction_spec.rb
index 640bbebf0da..b2a53fe1626 100644
--- a/spec/lib/gitlab/metrics/background_transaction_spec.rb
+++ b/spec/lib/gitlab/metrics/background_transaction_spec.rb
@@ -4,16 +4,30 @@ require 'spec_helper'
 
 RSpec.describe Gitlab::Metrics::BackgroundTransaction do
   let(:test_worker_class) { double(:class, name: 'TestWorker') }
+  let(:prometheus_metric) { instance_double(Prometheus::Client::Metric, base_labels: {}) }
+
+  before do
+    allow(described_class).to receive(:prometheus_metric).and_return(prometheus_metric)
+  end
 
   subject { described_class.new(test_worker_class) }
 
+  RSpec.shared_examples 'metric with worker labels' do |metric_method|
+    it 'measures with correct labels and value' do
+      value = 1
+      expect(prometheus_metric).to receive(metric_method).with({ controller: 'TestWorker', action: 'perform', feature_category: '' }, value)
+
+      subject.send(metric_method, :bau, value)
+    end
+  end
+
   describe '#label' do
     it 'returns labels based on class name' do
       expect(subject.labels).to eq(controller: 'TestWorker', action: 'perform', feature_category: '')
     end
 
     it 'contains only the labels defined for metrics' do
-      expect(subject.labels.keys).to contain_exactly(*described_class.superclass::BASE_LABELS.keys)
+      expect(subject.labels.keys).to contain_exactly(*described_class.superclass::BASE_LABEL_KEYS)
     end
 
     it 'includes the feature category if there is one' do
@@ -21,4 +35,22 @@ RSpec.describe Gitlab::Metrics::BackgroundTransaction do
       expect(subject.labels).to include(feature_category: 'source_code_management')
     end
   end
+
+  describe '#increment' do
+    let(:prometheus_metric) { instance_double(Prometheus::Client::Counter, :increment, base_labels: {}) }
+
+    it_behaves_like 'metric with worker labels', :increment
+  end
+
+  describe '#set' do
+    let(:prometheus_metric) { instance_double(Prometheus::Client::Gauge, :set, base_labels: {}) }
+
+    it_behaves_like 'metric with worker labels', :set
+  end
+
+  describe '#observe' do
+    let(:prometheus_metric) { instance_double(Prometheus::Client::Histogram, :observe, base_labels: {}) }
+
+    it_behaves_like 'metric with worker labels', :observe
+  end
 end