1 files changed, 77 insertions, 0 deletions
diff --git a/spec/models/performance_monitoring/prometheus_panel_spec.rb b/spec/models/performance_monitoring/prometheus_panel_spec.rb
new file mode 100644
index 00000000000..f5e04ec91e2
--- /dev/null
+++ b/spec/models/performance_monitoring/prometheus_panel_spec.rb
@@ -0,0 +1,77 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe PerformanceMonitoring::PrometheusPanel do
+  let(:json_content) do
+    {
+      "max_value" => 1,
+      "type" => "area-chart",
+      "title" => "Chart Title",
+      "y_label" => "Y-Axis",
+      "weight" => 1,
+      "metrics" => [{
+        "id" => "metric_of_ages",
+        "unit" => "count",
+        "label" => "Metric of Ages",
+        "query_range" => "http_requests_total"
+      }]
+    }
+  end
+
+  describe '#new' do
+    it 'accepts old schema format' do
+      expect { described_class.new(json_content) }.not_to raise_error
+    end
+
+    it 'accepts new schema format' do
+      expect { described_class.new(json_content.merge("y_axis" => { "precision" => 0 })) }.not_to raise_error
+    end
+  end
+
+  describe '.from_json' do
+    subject { described_class.from_json(json_content) }
+
+    it 'creates a PrometheusPanelGroup object' do
+      expect(subject).to be_a PerformanceMonitoring::PrometheusPanel
+      expect(subject.type).to eq(json_content['type'])
+      expect(subject.title).to eq(json_content['title'])
+      expect(subject.y_label).to eq(json_content['y_label'])
+      expect(subject.weight).to eq(json_content['weight'])
+      expect(subject.metrics).to all(be_a PerformanceMonitoring::PrometheusMetric)
+    end
+
+    describe 'validations' do
+      context 'when title is missing' do
+        before do
+          json_content['title'] = nil
+        end
+
+        subject { described_class.from_json(json_content) }
+
+        it { expect { subject }.to raise_error(ActiveModel::ValidationError) }
+      end
+
+      context 'when metrics are missing' do
+        before do
+          json_content['metrics'] = []
+        end
+
+        subject { described_class.from_json(json_content) }
+
+        it { expect { subject }.to raise_error(ActiveModel::ValidationError) }
+      end
+    end
+  end
+
+  describe '.id' do
+    it 'returns hexdigest of group_title, type and title as the panel id' do
+      group_title = 'Business Group'
+      panel_type  = 'area-chart'
+      panel_title = 'New feature requests made'
+
+      expect(Digest::SHA2).to receive(:hexdigest).with("#{group_title}#{panel_type}#{panel_title}").and_return('hexdigest')
+      expect(described_class.new(title: panel_title, type: panel_type).id(group_title)).to eql 'hexdigest'
+    end
+  end
+end