[英]How to jest mock a function living within another react component?
我一直在嘗試為以下反應組件編寫測試,這些組件根據我的道具返回不同的組件:
const Choice: React.FC<States> = props => {
function getChoiceComponent(): JSX.Element {
if (props.choices) {
return <FirstComponent {...props} />;
} else {
return <SecondComponent {...props} />;
}
}
return <>{getChoiceComponent()}</>;
};
如何模擬getChoiceComponent
函數並對其進行測試?
我們應該通過更改 props 和 state 來測試 react 組件,而不是直接測試getChoiceComponent
方法。 這是單元測試解決方案,
index.tsx
:
import React from 'react';
import FirstComponent from './first';
import SecondComponent from './second';
type States = any;
const Choice: React.FC<States> = (props) => {
function getChoiceComponent(): JSX.Element {
if (props.choices) {
return <FirstComponent {...props} />;
} else {
return <SecondComponent {...props} />;
}
}
return <>{getChoiceComponent()}</>;
};
export default Choice;
first.tsx
:
import React from 'react';
const FirstComponent = () => <div>first component</div>;
export default FirstComponent;
second.tsx
:
import React from 'react';
const SecondComponent = () => <div>second component</div>;
export default SecondComponent;
index.test.tsx
:
import Choice from './';
import FirstComponent from './first';
import SecondComponent from './second';
import React from 'react';
import { shallow } from 'enzyme';
describe('60152774', () => {
it('should render first component', () => {
const props = { choices: [] };
const wrapper = shallow(<Choice {...props}></Choice>);
expect(wrapper.find(FirstComponent)).toBeTruthy();
});
it('should render second component', () => {
const props = {};
const wrapper = shallow(<Choice {...props}></Choice>);
expect(wrapper.find(SecondComponent)).toBeTruthy();
});
});
帶有覆蓋率報告的單元測試結果:
PASS stackoverflow/60152774/index.test.tsx
60152774
✓ should render first component (20ms)
✓ should render second component (5ms)
------------|---------|----------|---------|---------|-------------------
File | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s
------------|---------|----------|---------|---------|-------------------
All files | 88.24 | 100 | 50 | 100 |
first.tsx | 75 | 100 | 0 | 100 |
index.tsx | 100 | 100 | 100 | 100 |
second.tsx | 75 | 100 | 0 | 100 |
------------|---------|----------|---------|---------|-------------------
Test Suites: 1 passed, 1 total
Tests: 2 passed, 2 total
Snapshots: 0 total
Time: 3.065s
源代碼: https : //github.com/mrdulin/react-apollo-graphql-starter-kit/tree/master/stackoverflow/60152774
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