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index.spec.js
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index.spec.js
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import React from 'react';
import { render } from 'react-testing-library';
import 'react-testing-library/cleanup-after-each';
import snapshotDiff from 'snapshot-diff';
import TeX from './index';
const _ = String.raw;
describe('TeX', () => {
test('expression via props.children', () => {
expect(render(<TeX>\sum_0^\infty</TeX>).container).toMatchSnapshot();
});
test('expression via props.math', () => {
expect(render(<TeX math={_`\sum_0^\infty`} />).container).toMatchSnapshot();
});
test('inline math by default', () => {
const $ = render(<TeX data-testid="wrapper" math={_`\sum_0^\infty`} />);
expect($.getByTestId('wrapper').tagName).toBe('SPAN');
});
test('block math via props.block', () => {
const $ = render(
<TeX data-testid="wrapper" math={_`\sum_0^\infty`} block />
);
expect($.getByTestId('wrapper').tagName).toBe('DIV');
});
test('configuring KaTeX via props.settings', () => {
const $ = render(
<TeX settings={{ macros: { '*': 'cdot' } }}>y = k * x + c</TeX>
);
expect($.container).toMatchSnapshot();
});
test('props updated', () => {
const $ = render(<TeX>\sum_0^\infty</TeX>);
const $first = $.container.cloneNode(true);
let $second;
$.rerender(<TeX>\sum_1^\infty</TeX>);
$second = $.container.cloneNode(true);
expect(snapshotDiff($first, $second)).toMatchSnapshot();
});
describe('error handling', () => {
test('show error when it updates from invalid to valid formula', () => {
const renderError = error => (
<p>{error.message} Cannot render this formula.</p>
);
const $ = render(<TeX renderError={renderError}>\inta</TeX>);
expect($.queryByText(/Cannot render this formula/)).not.toBeNull();
$.rerender(<TeX renderError={renderError}>\sum_1^\infty</TeX>);
expect($.queryByText(/Cannot render this formula/)).toBeNull();
});
test('show error when it updates from invalid to valid formula', () => {
const renderError = error => (
<p>{error.message} Cannot render this formula.</p>
);
const $ = render(<TeX renderError={renderError}>\sum_1^\infty</TeX>);
expect($.queryByText(/Cannot render this formula/)).toBeNull();
$.rerender(<TeX renderError={renderError}>\inta</TeX>);
expect($.queryByText(/Cannot render this formula/)).not.toBeNull();
});
test('formula with the wrong part highlighted in default color', () => {
const $ = render(<TeX>\inta</TeX>);
expect($.container).toMatchSnapshot();
});
test('props.errorColor', () => {
const $ = render(<TeX errorColor="#bb0000">\inta</TeX>);
expect($.container).toMatchSnapshot();
});
test('invalid type of expression in props.math', () => {
let $;
/* eslint-disable-next-line */
console.error = jest.fn();
$ = render(<TeX math={123} />);
expect(
$.queryByText(/KaTeX can only parse string typed expression/)
).not.toBeNull();
});
test('error is caused while parsing math expression', () => {
let $;
$ = render(<TeX math={_`\sum_{`} />);
expect($.container).toMatchSnapshot();
});
test('props.renderError: invalid type of expression in props.math', () => {
const renderError = error => <div>Message of error: {error.message}</div>;
let $;
$ = render(<TeX math={123} renderError={renderError} />);
expect($.container).toMatchSnapshot();
});
test('props.renderError: error is caused while parsing math expression', () => {
const renderError = error => <div>Message of error: {error.message}</div>;
let $;
$ = render(<TeX math={_`\sum_{`} renderError={renderError} />);
expect($.container).toMatchSnapshot();
});
});
describe('passing through other props', () => {
test('style', () => {
const $ = render(<TeX style={{ background: 'blue' }}>1 + 2 = 3</TeX>);
expect($.container).toMatchSnapshot();
});
test('className', () => {
const $ = render(<TeX className="foo">1 + 2 = 3</TeX>);
expect($.container).toMatchSnapshot();
});
});
});