Add mock daily cost data for test purposes

plugins/cost-insights/src/components/CostOverviewCard/CostOverviewCard.tsx

@@ -50,7 +50,7 @@ export const CostOverviewCard = ({
     ? findAlways(config.metrics, m => m.kind === filters.metric)
     : null;
   const comparedChange = metricData
-    ? getComparedChange(dailyCostData, metricData)
+    ? getComparedChange(dailyCostData, metricData, filters.duration)
     : null;
 
   return (

plugins/cost-insights/src/utils/change.test.ts

@@ -14,8 +14,15 @@
  * limitations under the License.
  */
 
-import { growthOf } from './change';
-import { GrowthType, ChangeThreshold, EngineerThreshold } from '../types';
+import { growthOf, getPreviousPeriodTotalCost } from './change';
+import {
+  GrowthType,
+  ChangeThreshold,
+  EngineerThreshold,
+  Duration,
+  Cost,
+} from '../types';
+import { MockAggregatedDailyCosts, trendlineOf, changeOf } from './mockData';
 
 const GrowthMap = {
   [GrowthType.Negligible]: 'negligible growth',
@@ -60,3 +67,17 @@ describe.each`
     });
   },
 );
+
+describe('getPreviousPeriodTotalCost', () => {
+  it('Correctly returns the total cost for the previous period given daily costs', () => {
+    const mockGroupDailyCost: Cost = {
+      id: 'test-group',
+      aggregation: MockAggregatedDailyCosts,
+      change: changeOf(MockAggregatedDailyCosts),
+      trendline: trendlineOf(MockAggregatedDailyCosts),
+    };
+    expect(
+      getPreviousPeriodTotalCost(mockGroupDailyCost, Duration.P1M),
+    ).toEqual(100_000);
+  });
+});

plugins/cost-insights/src/utils/mockData.ts

@@ -215,3 +215,250 @@ export function changeOf(aggregation: DateAggregation[]): ChangeStatistic {
     amount: after - before,
   };
 }
+
+export const MockAggregatedDailyCosts: DateAggregation[] = [
+  {
+    date: '2020-08-07',
+    amount: 3500,
+  },
+  {
+    date: '2020-08-06',
+    amount: 2500,
+  },
+  {
+    date: '2020-08-05',
+    amount: 1400,
+  },
+  {
+    date: '2020-08-04',
+    amount: 3800,
+  },
+  {
+    date: '2020-08-09',
+    amount: 1900,
+  },
+  {
+    date: '2020-08-08',
+    amount: 2400,
+  },
+  {
+    date: '2020-08-03',
+    amount: 4000,
+  },
+  {
+    date: '2020-08-02',
+    amount: 3700,
+  },
+  {
+    date: '2020-08-01',
+    amount: 2500,
+  },
+  {
+    date: '2020-08-18',
+    amount: 4300,
+  },
+  {
+    date: '2020-08-17',
+    amount: 1500,
+  },
+  {
+    date: '2020-08-16',
+    amount: 3600,
+  },
+  {
+    date: '2020-08-15',
+    amount: 2200,
+  },
+  {
+    date: '2020-08-19',
+    amount: 3900,
+  },
+  {
+    date: '2020-08-10',
+    amount: 4100,
+  },
+  {
+    date: '2020-08-14',
+    amount: 3600,
+  },
+  {
+    date: '2020-08-13',
+    amount: 2900,
+  },
+  {
+    date: '2020-08-12',
+    amount: 2700,
+  },
+  {
+    date: '2020-08-11',
+    amount: 5100,
+  },
+  {
+    date: '2020-09-19',
+    amount: 1200,
+  },
+  {
+    date: '2020-09-18',
+    amount: 6500,
+  },
+  {
+    date: '2020-09-17',
+    amount: 2500,
+  },
+  {
+    date: '2020-09-16',
+    amount: 1400,
+  },
+  {
+    date: '2020-09-11',
+    amount: 2300,
+  },
+  {
+    date: '2020-09-10',
+    amount: 1900,
+  },
+  {
+    date: '2020-09-15',
+    amount: 3100,
+  },
+  {
+    date: '2020-09-14',
+    amount: 4500,
+  },
+  {
+    date: '2020-09-13',
+    amount: 3300,
+  },
+  {
+    date: '2020-09-12',
+    amount: 2800,
+  },
+  {
+    date: '2020-09-29',
+    amount: 2600,
+  },
+  {
+    date: '2020-09-28',
+    amount: 4100,
+  },
+  {
+    date: '2020-09-27',
+    amount: 3800,
+  },
+  {
+    date: '2020-09-22',
+    amount: 3700,
+  },
+  {
+    date: '2020-09-21',
+    amount: 2700,
+  },
+  {
+    date: '2020-09-20',
+    amount: 2200,
+  },
+  {
+    date: '2020-09-26',
+    amount: 3300,
+  },
+  {
+    date: '2020-09-25',
+    amount: 4000,
+  },
+  {
+    date: '2020-09-24',
+    amount: 3800,
+  },
+  {
+    date: '2020-09-23',
+    amount: 4100,
+  },
+  {
+    date: '2020-08-29',
+    amount: 4400,
+  },
+  {
+    date: '2020-08-28',
+    amount: 5000,
+  },
+  {
+    date: '2020-08-27',
+    amount: 4900,
+  },
+  {
+    date: '2020-08-26',
+    amount: 4100,
+  },
+  {
+    date: '2020-08-21',
+    amount: 3700,
+  },
+  {
+    date: '2020-08-20',
+    amount: 2200,
+  },
+  {
+    date: '2020-08-25',
+    amount: 1700,
+  },
+  {
+    date: '2020-08-24',
+    amount: 2100,
+  },
+  {
+    date: '2020-08-23',
+    amount: 3100,
+  },
+  {
+    date: '2020-08-22',
+    amount: 1500,
+  },
+  {
+    date: '2020-09-08',
+    amount: 2900,
+  },
+  {
+    date: '2020-09-07',
+    amount: 4100,
+  },
+  {
+    date: '2020-09-06',
+    amount: 3600,
+  },
+  {
+    date: '2020-09-05',
+    amount: 3300,
+  },
+  {
+    date: '2020-09-09',
+    amount: 2800,
+  },
+  {
+    date: '2020-08-31',
+    amount: 3400,
+  },
+  {
+    date: '2020-08-30',
+    amount: 4300,
+  },
+  {
+    date: '2020-09-04',
+    amount: 6100,
+  },
+  {
+    date: '2020-09-03',
+    amount: 2500,
+  },
+  {
+    date: '2020-09-02',
+    amount: 4900,
+  },
+  {
+    date: '2020-09-01',
+    amount: 6100,
+  },
+  {
+    date: '2020-09-30',
+    amount: 5500,
+  },
+];