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feat: add debug to render helpers for easier console debugging (#65)
* feat: add debug to render helpers for easier console debugging * bring back toJSON to docs * revert unnecessary change * update TS * remove cyclic dependency of debug <-> render
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‎README.md

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@@ -147,6 +147,33 @@ Unmount the in-memory tree, triggering the appropriate lifecycle events
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When using React context providers, like Redux Provider, you'll likely want to wrap rendered component with them. In such cases it's convenient to create your custom `render` method. [Follow this great guide on how to set this up](https://github.com/kentcdodds/react-testing-library#custom-render).
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### `debug: (message?: string) => void`
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Prints deeply rendered component passed to `render` with optional message on top. Uses [debug.deep](#debug) under the hood, but it's easier to use.
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```jsx
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const { debug } = render(<Component />);
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debug('optional message');
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```
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logs optional message and colored JSX:
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```jsx
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optional message
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<TouchableOpacity
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activeOpacity={0.2}
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onPress={[Function bound fn]}
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>
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<Text>Press me</Text>
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</TouchableOpacity>
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```
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### `debug.shallow: (message?: string) => void`
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Prints shallowly rendered component passed to `render` with optional message on top. Uses [debug.shallow](#debug) under the hood, but it's easier to use.
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### `toJSON: () => ?ReactTestRendererJSON`
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Get the rendered component JSON representation, e.g. for snapshot testing.

‎src/__tests__/__snapshots__/render.test.js.snap

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// Jest Snapshot v1, https://goo.gl/fbAQLP
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exports[`debug 1`] = `
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"<View>
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<Text>
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Is the banana fresh?
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</Text>
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<Text
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testID=\\"bananaFresh\\"
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>
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not fresh
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</Text>
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<View
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accessible={true}
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isTVSelectable={true}
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onResponderGrant={[Function bound touchableHandleResponderGrant]}
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onResponderMove={[Function bound touchableHandleResponderMove]}
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onResponderRelease={[Function bound touchableHandleResponderRelease]}
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onResponderTerminate={[Function bound touchableHandleResponderTerminate]}
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onResponderTerminationRequest={[Function bound touchableHandleResponderTerminationRequest]}
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onStartShouldSetResponder={[Function bound touchableHandleStartShouldSetResponder]}
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style={
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Object {
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\\"opacity\\": 1,
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}
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}
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>
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<Text>
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Change freshness!
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</Text>
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</View>
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</View>"
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`;
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exports[`debug changing component: bananaFresh button message should now be "fresh" 1`] = `
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"<View>
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<Text>
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Is the banana fresh?
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</Text>
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<Text
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testID=\\"bananaFresh\\"
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>
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fresh
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</Text>
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<View
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accessible={true}
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isTVSelectable={true}
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onResponderGrant={[Function bound touchableHandleResponderGrant]}
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onResponderMove={[Function bound touchableHandleResponderMove]}
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onResponderRelease={[Function bound touchableHandleResponderRelease]}
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onResponderTerminate={[Function bound touchableHandleResponderTerminate]}
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onResponderTerminationRequest={[Function bound touchableHandleResponderTerminationRequest]}
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onStartShouldSetResponder={[Function bound touchableHandleStartShouldSetResponder]}
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style={
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Object {
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\\"opacity\\": 1,
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}
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}
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>
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<Text>
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Change freshness!
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</Text>
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</View>
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</View>"
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`;
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exports[`debug: shallow 1`] = `
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"<View>
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<Text>
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Is the banana fresh?
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</Text>
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<Text
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testID=\\"bananaFresh\\"
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>
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not fresh
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</Text>
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<Button
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onPress={[Function anonymous]}
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type=\\"primary\\"
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>
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Change freshness!
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</Button>
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</View>"
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`;
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exports[`debug: shallow with message 1`] = `
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"my other custom message
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<View>
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<Text>
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Is the banana fresh?
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</Text>
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<Text
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testID=\\"bananaFresh\\"
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>
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not fresh
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</Text>
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<Button
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onPress={[Function anonymous]}
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type=\\"primary\\"
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>
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Change freshness!
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</Button>
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</View>"
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`;
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exports[`debug: with message 1`] = `
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"my custom message
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<View>
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<Text>
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Is the banana fresh?
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</Text>
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<Text
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testID=\\"bananaFresh\\"
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>
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not fresh
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</Text>
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<View
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accessible={true}
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isTVSelectable={true}
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onResponderGrant={[Function bound touchableHandleResponderGrant]}
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onResponderMove={[Function bound touchableHandleResponderMove]}
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onResponderRelease={[Function bound touchableHandleResponderRelease]}
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onResponderTerminate={[Function bound touchableHandleResponderTerminate]}
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onResponderTerminationRequest={[Function bound touchableHandleResponderTerminationRequest]}
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onStartShouldSetResponder={[Function bound touchableHandleStartShouldSetResponder]}
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style={
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Object {
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\\"opacity\\": 1,
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}
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}
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>
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<Text>
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Change freshness!
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</Text>
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</View>
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</View>"
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`;
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exports[`toJSON 1`] = `
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<View
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accessible={true}

‎src/__tests__/debug.test.js

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@@ -4,6 +4,7 @@ import React from 'react';
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import { TouchableOpacity, Text } from 'react-native';
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import stripAnsi from 'strip-ansi';
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import { debug, render, fireEvent, flushMicrotasksQueue } from '..';
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import debugShallow from '../helpers/debugShallow';
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function TextComponent({ text }) {
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return <Text>{text}</Text>;
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debug(component, 'test message');
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expect(console.log).toBeCalledWith(output, 'test message');
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expect(console.log).toBeCalledWith('test message\n\n', output);
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});
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test('debug.shallow', () => {
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expect(debug.shallow).toBe(debug);
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expect(debug.shallow).toBe(debugShallow);
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});
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test('debug.deep', () => {
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debug.deep(component, 'test message');
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expect(console.log).toBeCalledWith(output, 'test message');
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expect(console.log).toBeCalledWith('test message\n\n', output);
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});
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test('debug.deep async test', async () => {

‎src/__tests__/render.test.js

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/* eslint-disable react/no-multi-comp */
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import React from 'react';
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import { View, Text, TouchableOpacity } from 'react-native';
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import { render } from '..';
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import stripAnsi from 'strip-ansi';
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import { render, fireEvent } from '..';
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class Button extends React.Component<*> {
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render() {
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expect(toJSON()).toMatchSnapshot();
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});
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test('debug', () => {
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jest.spyOn(console, 'log').mockImplementation(x => x);
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const { debug } = render(<Banana />);
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debug();
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debug('my custom message');
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debug.shallow();
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debug.shallow('my other custom message');
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// eslint-disable-next-line no-console
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const mockCalls = console.log.mock.calls;
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expect(stripAnsi(mockCalls[0][0])).toMatchSnapshot();
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expect(stripAnsi(mockCalls[1][0] + mockCalls[1][1])).toMatchSnapshot(
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'with message'
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);
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expect(stripAnsi(mockCalls[2][0])).toMatchSnapshot('shallow');
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expect(stripAnsi(mockCalls[3][0] + mockCalls[3][1])).toMatchSnapshot(
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'shallow with message'
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);
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});
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test('debug changing component', () => {
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jest.spyOn(console, 'log').mockImplementation(x => x);
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const { getByProps, debug } = render(<Banana />);
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fireEvent.press(getByProps({ type: 'primary' }));
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debug();
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// eslint-disable-next-line no-console
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const mockCalls = console.log.mock.calls;
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expect(stripAnsi(mockCalls[4][0])).toMatchSnapshot(
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'bananaFresh button message should now be "fresh"'
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);
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});

‎src/debug.js

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// @flow
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/* eslint-disable no-console */
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import * as React from 'react';
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import prettyFormat, { plugins } from 'pretty-format';
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import shallow from './shallow';
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import render from './render';
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/**
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* Log pretty-printed shallow test component instance
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*/
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function debugShallow(
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instance: ReactTestInstance | React.Element<*>,
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message?: any
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) {
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const { output } = shallow(instance);
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console.log(format(output), message || '');
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}
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import debugShallow from './helpers/debugShallow';
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import debugDeep from './helpers/debugDeep';
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import format from './helpers/format';
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/**
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* Log pretty-printed deep test component instance
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*/
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function debugDeep(
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function debugDeepElementOrInstance(
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instance: React.Element<*> | ?ReactTestRendererJSON,
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message?: any = ''
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) {
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// rendering ?ReactTestRendererJSON
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// $FlowFixMe
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const { toJSON } = render(instance);
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console.log(format(toJSON()), message);
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if (message) {
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console.log(`${message}\n\n`, format(toJSON()));
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} else {
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console.log(format(toJSON()));
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}
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} catch (e) {
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console.log(format(instance), message);
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// $FlowFixMe
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debugDeep(instance);
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}
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}
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const format = input =>
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prettyFormat(input, {
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plugins: [plugins.ReactTestComponent, plugins.ReactElement],
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highlight: true,
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});
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const debug = debugShallow;
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function debug(instance: ReactTestInstance | React.Element<*>, message?: any) {
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return debugShallow(instance, message);
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}
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debug.shallow = debugShallow;
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debug.deep = debugDeep;
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debug.deep = debugDeepElementOrInstance;
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export default debug;

‎src/helpers/debugDeep.js

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// @flow
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import format from './format';
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/**
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* Log pretty-printed deep test component instance
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*/
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export default function debugDeep(
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instance: ?ReactTestRendererJSON,
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message?: any = ''
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) {
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if (message) {
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console.log(`${message}\n\n`, format(instance));
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} else {
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console.log(format(instance));
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}
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}

‎src/helpers/debugShallow.js

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// @flow
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import * as React from 'react';
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import shallow from '../shallow';
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import format from './format';
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/**
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* Log pretty-printed shallow test component instance
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*/
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export default function debugShallow(
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instance: ReactTestInstance | React.Element<*>,
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message?: any
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) {
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const { output } = shallow(instance);
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if (message) {
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console.log(`${message}\n\n`, format(output));
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} else {
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console.log(format(output));
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}
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}

‎src/helpers/format.js

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// @flow
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import prettyFormat, { plugins } from 'pretty-format';
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const format = (input: ?ReactTestRendererJSON) =>
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prettyFormat(input, {
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plugins: [plugins.ReactTestComponent, plugins.ReactElement],
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highlight: true,
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});
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export default format;

‎src/render.js

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import TestRenderer from 'react-test-renderer'; // eslint-disable-line import/no-extraneous-dependencies
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import { getByAPI } from './helpers/getByAPI';
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import { queryByAPI } from './helpers/queryByAPI';
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import debugShallow from './helpers/debugShallow';
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import debugDeep from './helpers/debugDeep';
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/**
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* Renders test component deeply using react-test-renderer and exposes helpers
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update: renderer.update,
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unmount: renderer.unmount,
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toJSON: renderer.toJSON,
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debug: debug(instance, renderer),
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};
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}
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function debug(instance: ReactTestInstance, renderer) {
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function debugImpl(message?: string) {
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return debugDeep(renderer.toJSON(), message);
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}
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debugImpl.shallow = message => debugShallow(instance, message);
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return debugImpl;
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}

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