Instrument GitLab Shell and log metrics data to a file62-instrument-gitlab-shell

1 files changed, 30 insertions, 0 deletions

diff --git a/spec/gitlab_metrics_spec.rb b/spec/gitlab_metrics_spec.rb
new file mode 100644
index 0000000..885fa3b
--- /dev/null
+++ b/spec/gitlab_metrics_spec.rb
@@ -0,0 +1,30 @@
+require_relative 'spec_helper'
+require_relative '../lib/gitlab_metrics'
+
+describe GitlabMetrics do
+  describe '::measure' do
+    it 'returns the return value of the block' do
+      val = described_class.measure('foo') { 10 }
+
+      expect(val).to eq(10)
+    end
+
+    it 'write in a file metrics data' do
+      result = nil
+      expect(described_class.logger).to receive(:debug) do |&b|
+        result = b.call
+      end
+
+      described_class.measure('foo') { 10 }
+
+      expect(result).to match(/name=\"foo\" wall_time=\d+ cpu_time=\d+/)
+    end
+
+    it 'calls proper measure methods' do
+      expect(described_class::System).to receive(:monotonic_time).twice.and_call_original
+      expect(described_class::System).to receive(:cpu_time).twice.and_call_original
+
+      described_class.measure('foo') { 10 }
+    end
+  end
+end