adding unit test

x-pack/plugins/apm/public/services/rest/observability.dashboard.test.ts

@@ -0,0 +1,106 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License;
+ * you may not use this file except in compliance with the Elastic License.
+ */
+
+import { fetchData, hasData } from './observability_dashboard';
+import * as createCallApmApi from './createCallApmApi';
+
+describe('Observability dashboard data', () => {
+  const callApmApiMock = jest.spyOn(createCallApmApi, 'callApmApi');
+  afterEach(() => {
+    callApmApiMock.mockClear();
+  });
+  describe('hasData', () => {
+    it('returns false when no data is available', async () => {
+      callApmApiMock.mockImplementation(() => Promise.resolve(false));
+      const response = await hasData();
+      expect(response).toBeFalsy();
+    });
+    it('returns true when data is available', async () => {
+      callApmApiMock.mockImplementation(() => Promise.resolve(true));
+      const response = await hasData();
+      expect(response).toBeTruthy();
+    });
+  });
+
+  describe('fetchData', () => {
+    it('returns APM data with series and stats', async () => {
+      callApmApiMock.mockImplementation(() =>
+        Promise.resolve({
+          serviceCount: 10,
+          transactionCoordinates: [
+            { x: 1, y: 1 },
+            { x: 2, y: 2 },
+            { x: 3, y: 3 },
+          ],
+        })
+      );
+      const response = await fetchData({
+        startTime: '1',
+        endTime: '2',
+        bucketSize: '3',
+      });
+      expect(response).toEqual({
+        title: 'APM',
+        appLink: '/app/apm',
+        stats: {
+          services: {
+            label: 'Services',
+            value: 10,
+          },
+          transactions: {
+            label: 'Transactions',
+            value: 6,
+          },
+        },
+        series: {
+          transactions: {
+            label: 'Transactions',
+            coordinates: [
+              { x: 1, y: 1 },
+              { x: 2, y: 2 },
+              { x: 3, y: 3 },
+            ],
+            color: 'euiColorVis1',
+          },
+        },
+      });
+    });
+    it('returns empty transaction coordinates', async () => {
+      callApmApiMock.mockImplementation(() =>
+        Promise.resolve({
+          serviceCount: 0,
+          transactionCoordinates: [],
+        })
+      );
+      const response = await fetchData({
+        startTime: '1',
+        endTime: '2',
+        bucketSize: '3',
+      });
+      expect(response).toEqual({
+        title: 'APM',
+        appLink: '/app/apm',
+        stats: {
+          services: {
+            label: 'Services',
+            value: 0,
+          },
+          transactions: {
+            label: 'Transactions',
+            value: 0,
+          },
+        },
+        series: {
+          transactions: {
+            label: 'Transactions',
+            coordinates: [],
+            color: 'euiColorVis1',
+          },
+        },
+      });
+    });
+  });
+});