1 files changed, 67 insertions, 0 deletions
diff --git a/spec/lib/gitlab/graphql/generic_tracing_spec.rb b/spec/lib/gitlab/graphql/generic_tracing_spec.rb
new file mode 100644
index 00000000000..ae92dcc40af
--- /dev/null
+++ b/spec/lib/gitlab/graphql/generic_tracing_spec.rb
@@ -0,0 +1,67 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe Gitlab::Graphql::GenericTracing do
+  let(:graphql_duration_seconds_histogram) { double('Gitlab::Metrics::NullMetric') }
+
+  it 'updates graphql histogram with expected labels' do
+    query = 'query { users { id } }'
+    tracer = described_class.new
+
+    allow(tracer)
+      .to receive(:graphql_duration_seconds)
+      .and_return(graphql_duration_seconds_histogram)
+
+    expect_metric('graphql.lex', 'lex')
+    expect_metric('graphql.parse', 'parse')
+    expect_metric('graphql.validate', 'validate')
+    expect_metric('graphql.analyze', 'analyze_multiplex')
+    expect_metric('graphql.execute', 'execute_query_lazy')
+    expect_metric('graphql.execute', 'execute_multiplex')
+
+    GitlabSchema.execute(query, context: { tracers: [tracer] })
+  end
+
+  context "when labkit tracing is enabled" do
+    before do
+      expect(Labkit::Tracing).to receive(:enabled?).and_return(true)
+    end
+
+    it 'yields with labkit tracing' do
+      expected_tags = {
+        'component' => 'web',
+        'span.kind' => 'server',
+        'platform_key' => 'pkey',
+        'key' => 'key'
+      }
+
+      expect(Labkit::Tracing)
+        .to receive(:with_tracing)
+        .with(operation_name: "pkey.key", tags: expected_tags)
+        .and_yield
+
+      expect { |b| described_class.new.platform_trace('pkey', 'key', nil, &b) }.to yield_control
+    end
+  end
+
+  context "when labkit tracing is disabled" do
+    before do
+      expect(Labkit::Tracing).to receive(:enabled?).and_return(false)
+    end
+
+    it 'yields without measurement' do
+      expect(Labkit::Tracing).not_to receive(:with_tracing)
+
+      expect { |b| described_class.new.platform_trace('pkey', 'key', nil, &b) }.to yield_control
+    end
+  end
+
+  private
+
+  def expect_metric(platform_key, key)
+    expect(graphql_duration_seconds_histogram)
+      .to receive(:observe)
+      .with({ platform_key: platform_key, key: key }, be > 0.0)
+  end
+end