[Uptime] added test for chart wrapper (#50399) (#51808)

* added test for chart wrapper

* update unit test

* updated test selector

x-pack/legacy/plugins/uptime/public/components/functional/charts/__tests__/chart_wrapper.test.tsx

@@ -0,0 +1,83 @@
+/*
+ * 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 React from 'react';
+import { EuiSpacer } from '@elastic/eui';
+import { mount } from 'enzyme';
+import { nextTick } from 'test_utils/enzyme_helpers';
+import { shallowWithIntl } from 'test_utils/enzyme_helpers';
+import { ChartWrapper } from '../chart_wrapper';
+import { SnapshotHeading } from '../../snapshot_heading';
+import { DonutChart } from '../donut_chart';
+const SNAPSHOT_CHART_WIDTH = 144;
+const SNAPSHOT_CHART_HEIGHT = 144;
+describe('ChartWrapper component', () => {
+  it('renders the component with loading false', () => {
+    const component = shallowWithIntl(
+      <ChartWrapper loading={false}>
+        <SnapshotHeading down={8} total={12} />
+        <EuiSpacer size="xs" />
+        <DonutChart up={4} down={8} height={SNAPSHOT_CHART_HEIGHT} width={SNAPSHOT_CHART_WIDTH} />
+      </ChartWrapper>
+    );
+    expect(component).toMatchSnapshot();
+  });
+
+  it('renders the component with loading true', () => {
+    const component = shallowWithIntl(
+      <ChartWrapper loading={true}>
+        <SnapshotHeading down={8} total={12} />
+        <EuiSpacer size="xs" />
+        <DonutChart up={4} down={8} height={SNAPSHOT_CHART_HEIGHT} width={SNAPSHOT_CHART_WIDTH} />
+      </ChartWrapper>
+    );
+    expect(component).toMatchSnapshot();
+  });
+
+  it('mounts the component with loading true or false', async () => {
+    const component = mount(
+      <ChartWrapper loading={true}>
+        <SnapshotHeading down={8} total={12} />
+        <EuiSpacer size="xs" />
+        <DonutChart up={4} down={8} height={SNAPSHOT_CHART_HEIGHT} width={SNAPSHOT_CHART_WIDTH} />
+      </ChartWrapper>
+    );
+
+    let loadingChart = component.find(`.euiLoadingChart`);
+    expect(loadingChart.length).toBe(1);
+
+    component.setProps({
+      loading: false,
+    });
+    await nextTick();
+    component.update();
+
+    loadingChart = component.find(`.euiLoadingChart`);
+    expect(loadingChart.length).toBe(0);
+  });
+
+  it('mounts the component with chart when loading true or false', async () => {
+    const component = mount(
+      <ChartWrapper loading={true}>
+        <SnapshotHeading down={8} total={12} />
+        <EuiSpacer size="xs" />
+        <DonutChart up={4} down={8} height={SNAPSHOT_CHART_HEIGHT} width={SNAPSHOT_CHART_WIDTH} />
+      </ChartWrapper>
+    );
+
+    let donutChart = component.find(DonutChart);
+    expect(donutChart.length).toBe(1);
+
+    component.setProps({
+      loading: false,
+    });
+    await nextTick();
+    component.update();
+
+    donutChart = component.find(DonutChart);
+    expect(donutChart.length).toBe(1);
+  });
+});