1 files changed, 34 insertions, 0 deletions
diff --git a/spec/lib/gitlab/usage_data_counters/base_counter_spec.rb b/spec/lib/gitlab/usage_data_counters/base_counter_spec.rb
new file mode 100644
index 00000000000..4a31191d75f
--- /dev/null
+++ b/spec/lib/gitlab/usage_data_counters/base_counter_spec.rb
@@ -0,0 +1,34 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Gitlab::UsageDataCounters::BaseCounter do
+  describe '.fetch_supported_event' do
+    subject { described_class.fetch_supported_event(event_name) }
+
+    let(:event_name) { 'generic_event' }
+    let(:prefix) { 'generic' }
+    let(:known_events) { %w[event another_event] }
+
+    before do
+      allow(described_class).to receive(:prefix) { prefix }
+      allow(described_class).to receive(:known_events) { known_events }
+    end
+
+    it 'returns the matching event' do
+      is_expected.to eq 'event'
+    end
+
+    context 'when event is unknown' do
+      let(:event_name) { 'generic_unknown_event' }
+
+      it { is_expected.to be_nil }
+    end
+
+    context 'when prefix does not match the event name' do
+      let(:prefix) { 'special' }
+
+      it { is_expected.to be_nil }
+    end
+  end
+end