1 files changed, 18 insertions, 0 deletions
diff --git a/spec/lib/gitlab/metrics/prometheus_spec.rb b/spec/lib/gitlab/metrics/prometheus_spec.rb
new file mode 100644
index 00000000000..3d4dd5fdf01
--- /dev/null
+++ b/spec/lib/gitlab/metrics/prometheus_spec.rb
@@ -0,0 +1,18 @@
+require 'spec_helper'
+
+describe Gitlab::Metrics::Prometheus, :prometheus do
+  let(:all_metrics) { Gitlab::Metrics }
+  let(:registry) { all_metrics.registry }
+
+  describe '#reset_registry!' do
+    it 'clears existing metrics' do
+      registry.counter(:test, 'test metric')
+
+      expect(registry.metrics.count).to eq(1)
+
+      all_metrics.reset_registry!
+
+      expect(all_metrics.registry.metrics.count).to eq(0)
+    end
+  end
+end