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Percentage.test.js
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import React from 'react';
import renderer from 'react-test-renderer';
import { shallow } from 'enzyme';
import 'jest-styled-components';
import { ThemeProvider } from 'styled-components';
import { Provider } from 'react-redux';
import configureMockStore from 'redux-mock-store';
import { themeCommon } from '../../src/styles/themes/theme.common';
import Percentage from '../../src/components/Percentage';
const mockStore = configureMockStore();
const storeUnder40 = mockStore({
progress: {
answers: [{ correct: true }]
}
});
const storeUnder70 = mockStore({
progress: {
answers: [
{ correct: true },
{ correct: true },
{ correct: true },
{ correct: true },
{ correct: true },
{ correct: true },
{ correct: true },
{ correct: true },
{ correct: true },
{ correct: true }
]
}
});
const storeOver70 = mockStore({
progress: {
answers: [
{ correct: true },
{ correct: true },
{ correct: true },
{ correct: true },
{ correct: true },
{ correct: true },
{ correct: true },
{ correct: true },
{ correct: true },
{ correct: true },
{ correct: true },
{ correct: true },
{ correct: true },
{ correct: true },
{ correct: true },
{ correct: false },
{ correct: true }
]
}
});
describe('<Percentage /> component', () => {
let result;
beforeEach(() => {
// the wrapper DIV added to get rid of iterator key warning
result = shallow(
<div key="unique">
<Provider store={storeUnder40}>
<ThemeProvider theme={themeCommon}>
<Percentage />
</ThemeProvider>
</Provider>
</div>
);
});
it('renders without crashing', () => {
expect(result).toBeTruthy();
});
it('shows the percentage of correct answers', () => {
const expected = '5%';
expect(result.html()).toEqual(expect.stringContaining(expected));
});
it('shows the percentage under 40% in red', () => {
const tree = renderer.create(result).toJSON();
expect(tree.children[0]).toHaveStyleRule('color', 'red');
});
it('shows the percentage under 70% in orange', () => {
result = shallow(
<div key="unique">
<Provider store={storeUnder70}>
<ThemeProvider theme={themeCommon}>
<Percentage />
</ThemeProvider>
</Provider>
</div>
);
const tree = renderer.create(result).toJSON();
expect(tree.children[0]).toHaveStyleRule('color', 'orange');
});
it('shows the percentage over 70% in green', () => {
result = shallow(
<div key="unique">
<Provider store={storeOver70}>
<ThemeProvider theme={themeCommon}>
<Percentage />
</ThemeProvider>
</Provider>
</div>
);
const tree = renderer.create(result).toJSON();
expect(tree.children[0]).toHaveStyleRule('color', 'limegreen');
});
it('has styled-component rendered classes', () => {
const tree = renderer.create(result).toJSON();
expect(tree.children[0].props.className).toBeDefined();
});
it('matches the snapshot', () => {
const tree = renderer.create(result).toJSON();
expect(tree).toMatchSnapshot();
});
});