1 files changed, 40 insertions, 0 deletions
diff --git a/spec/lib/gitlab/usage/service_ping/legacy_metric_metadata_decorator_spec.rb b/spec/lib/gitlab/usage/service_ping/legacy_metric_metadata_decorator_spec.rb
new file mode 100644
index 00000000000..c8c2feda234
--- /dev/null
+++ b/spec/lib/gitlab/usage/service_ping/legacy_metric_metadata_decorator_spec.rb
@@ -0,0 +1,40 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Gitlab::Usage::ServicePing::LegacyMetricMetadataDecorator, feature_category: :service_ping do
+  using RSpec::Parameterized::TableSyntax
+
+  let(:duration) { 123 }
+
+  where(:metric_value, :error, :metric_class) do
+    1       | nil | Integer
+    "value" | nil | String
+    true    | nil | TrueClass
+    false   | nil | FalseClass
+    nil     | nil | NilClass
+    nil     | StandardError.new | NilClass
+  end
+
+  with_them do
+    let(:decorated_object) { described_class.new(metric_value, duration, error: error) }
+
+    it 'exposes a duration with the correct value' do
+      expect(decorated_object.duration).to eq(duration)
+    end
+
+    it 'exposes error with the correct value' do
+      expect(decorated_object.error).to eq(error)
+    end
+
+    it 'imitates wrapped class', :aggregate_failures do
+      expect(decorated_object).to eq metric_value
+      expect(decorated_object.class).to eq metric_class
+      expect(decorated_object.is_a?(metric_class)).to be_truthy
+      # rubocop:disable Style/ClassCheck
+      expect(decorated_object.kind_of?(metric_class)).to be_truthy
+      # rubocop:enable Style/ClassCheck
+      expect({ metric: decorated_object }.to_json).to eql({ metric: metric_value }.to_json)
+    end
+  end
+end