Charting: Adding tests for LineChart (#15700)

Cherry-pick of #15507.

change/@fluentui-react-charting-2020-10-26-12-57-10-lineChartTests.json

@@ -0,0 +1,8 @@
+{
+  "type": "none",
+  "comment": "Charting: Adding tests for LineChart.",
+  "packageName": "@fluentui/react-charting",
+  "email": "[email protected]",
+  "dependentChangeType": "patch",
+  "date": "2020-10-26T19:57:10.050Z"
+}

packages/react-charting/src/components/LineChart/LineChart.test.tsx

@@ -0,0 +1,145 @@
+jest.mock('react-dom');
+import * as React from 'react';
+import { resetIds } from '../../Utilities';
+import * as renderer from 'react-test-renderer';
+import { mount, ReactWrapper } from 'enzyme';
+import { ILineChartProps, LineChart } from './index';
+import { ILineChartState, LineChartBase } from './LineChart.base';
+
+// Wrapper of the LineChart to be tested.
+let wrapper: ReactWrapper<ILineChartProps, ILineChartState, LineChartBase> | undefined;
+
+function sharedBeforeEach() {
+  resetIds();
+}
+
+function sharedAfterEach() {
+  if (wrapper) {
+    wrapper.unmount();
+    wrapper = undefined;
+  }
+
+  // Do this after unmounting the wrapper to make sure if any timers cleaned up on unmount are
+  // cleaned up in fake timers world
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  if ((global.setTimeout as any).mock) {
+    jest.useRealTimers();
+  }
+}
+
+const points = [
+  {
+    legend: 'metaData1',
+    data: [
+      { x: 20, y: 50 },
+      { x: 40, y: 80 },
+    ],
+    color: 'red',
+  },
+];
+const chartPoints = {
+  chartTitle: 'LineChart',
+  lineChartData: points,
+};
+
+describe('LineChart snapShot testing', () => {
+  it('renders LineChart correctly', () => {
+    const component = renderer.create(<LineChart data={chartPoints} />);
+    const tree = component.toJSON();
+    expect(tree).toMatchSnapshot();
+  });
+
+  it('renders hideLegend correctly', () => {
+    const component = renderer.create(<LineChart data={chartPoints} hideLegend={true} />);
+    const tree = component.toJSON();
+    expect(tree).toMatchSnapshot();
+  });
+
+  it('renders hideTooltip correctly', () => {
+    const component = renderer.create(<LineChart data={chartPoints} hideTooltip={true} />);
+    const tree = component.toJSON();
+    expect(tree).toMatchSnapshot();
+  });
+
+  it('renders enabledLegendsWrapLines correctly', () => {
+    const component = renderer.create(<LineChart data={chartPoints} enabledLegendsWrapLines={true} />);
+    const tree = component.toJSON();
+    expect(tree).toMatchSnapshot();
+  });
+
+  it('renders showXAxisLablesTooltip correctly', () => {
+    const component = renderer.create(<LineChart data={chartPoints} showXAxisLablesTooltip={true} />);
+    const tree = component.toJSON();
+    expect(tree).toMatchSnapshot();
+  });
+
+  it('renders wrapXAxisLables correctly', () => {
+    const component = renderer.create(<LineChart data={chartPoints} wrapXAxisLables={true} />);
+    const tree = component.toJSON();
+    expect(tree).toMatchSnapshot();
+  });
+
+  it('renders yAxisTickFormat correctly', () => {
+    const component = renderer.create(<LineChart data={chartPoints} yAxisTickFormat={'/%d'} />);
+    const tree = component.toJSON();
+    expect(tree).toMatchSnapshot();
+  });
+});
+
+describe('LineChart - basic props', () => {
+  beforeEach(sharedBeforeEach);
+  afterEach(sharedAfterEach);
+
+  it('Should not mount legend when hideLegend true ', () => {
+    wrapper = mount(<LineChart data={chartPoints} hideLegend={true} />);
+    const hideLegendDOM = wrapper.getDOMNode().querySelectorAll('[class^="legendContainer"]');
+    expect(hideLegendDOM.length).toBe(0);
+  });
+
+  it('Should mount legend when hideLegend false ', () => {
+    wrapper = mount(<LineChart data={chartPoints} hideLegend={false} />);
+    const hideLegendDOM = wrapper.getDOMNode().querySelectorAll('[class^="legendContainer"]');
+    expect(hideLegendDOM).toBeDefined();
+  });
+
+  it('Should mount callout when hideTootip false ', () => {
+    wrapper = mount(<LineChart data={chartPoints} />);
+    const hideLegendDOM = wrapper.getDOMNode().querySelectorAll('[class^="ms-Layer"]');
+    expect(hideLegendDOM).toBeDefined();
+  });
+
+  it('Should not mount callout when hideTootip true ', () => {
+    wrapper = mount(<LineChart data={chartPoints} hideTooltip={true} />);
+    const hideLegendDOM = wrapper.getDOMNode().querySelectorAll('[class^="ms-Layer"]');
+    expect(hideLegendDOM.length).toBe(0);
+  });
+});
+
+describe('Render calling with respective to props', () => {
+  it('No prop changes', () => {
+    const renderMock = jest.spyOn(LineChartBase.prototype, 'render');
+    const props = {
+      data: chartPoints,
+      height: 300,
+      width: 600,
+    };
+    const component = mount(<LineChart {...props} />);
+    component.setProps({ ...props });
+    expect(renderMock).toHaveBeenCalledTimes(2);
+    renderMock.mockRestore();
+  });
+
+  it('prop changes', () => {
+    const renderMock = jest.spyOn(LineChartBase.prototype, 'render');
+    const props = {
+      data: chartPoints,
+      height: 300,
+      width: 600,
+      hideLegend: true,
+    };
+    const component = mount(<LineChart {...props} />);
+    component.setProps({ ...props, hideTooltip: true });
+    expect(renderMock).toHaveBeenCalledTimes(2);
+    renderMock.mockRestore();
+  });
+});