1 files changed, 42 insertions, 0 deletions
diff --git a/spec/services/metrics/sample_metrics_service_spec.rb b/spec/services/metrics/sample_metrics_service_spec.rb
new file mode 100644
index 00000000000..8574674ebc4
--- /dev/null
+++ b/spec/services/metrics/sample_metrics_service_spec.rb
@@ -0,0 +1,42 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe Metrics::SampleMetricsService do
+  describe 'query' do
+    subject { described_class.new(identifier).query }
+
+    context 'when the file is not found' do
+      let(:identifier) { nil }
+
+      it { is_expected.to be_nil }
+    end
+
+    context 'when the file is found' do
+      let(:identifier) { 'sample_metric_query_result' }
+      let(:source) { File.join(Rails.root, 'spec/fixtures/gitlab/sample_metrics', "#{identifier}.yml") }
+      let(:destination) { File.join(Rails.root, Metrics::SampleMetricsService::DIRECTORY, "#{identifier}.yml") }
+
+      around do |example|
+        FileUtils.mkdir_p(Metrics::SampleMetricsService::DIRECTORY)
+        FileUtils.cp(source, destination)
+
+        example.run
+      ensure
+        FileUtils.rm(destination)
+      end
+
+      subject { described_class.new(identifier).query }
+
+      it 'loads data from the sample file correctly' do
+        expect(subject).to eq(YAML.load_file(source))
+      end
+    end
+
+    context 'when the identifier is for a path outside of sample_metrics' do
+      let(:identifier) { '../config/secrets' }
+
+      it { is_expected.to be_nil }
+    end
+  end
+end