I'm trying to fix some unit test that passes regardless of what happens in the rendering.
import React from 'react';
import Component from './Component';
describe('Basic component tests', () => {
it('renders nothing on initial load', () => {
const component = shallow(<Component/>);
expect(component.exists()).toBe(false);
});
});
The problem is when I run this test I get an error in console.error but the test pass regardless. How do I check if the render happened without any error and fail the test if an error did occur?
Output example:
Debugger listening on ws://127.0.0.1:44345/7a8a35fb-7e19-4d92-8dc0-ea274fa1646c
For help, see: https://nodejs.org/en/docs/inspector
Debugger attached.
console.error src/components/universal/Component.js:91
TypeError: Cannot read property 'includes' of undefined
at includes (/home/frozendragon/code/application/src/components/universal/Component.js:412:45)
at Array.filter (<anonymous>)
at Component.filter [as getPackagesByIds] (/home/frozendragon/code/application/src/components/universal/Component.js:412:29)
at Component.getPackagesByIds (/home/frozendragon/code/application/src/components/universal/Component.js:86:36)
at tryCatch (/home/frozendragon/code/application/node_modules/@babel/polyfill/node_modules/regenerator-runtime/runtime.js:45:40)
at Generator.invoke [as _invoke] (/home/frozendragon/code/application/node_modules/@babel/polyfill/node_modules/regenerator-runtime/runtime.js:271:22)
at Generator.prototype.(anonymous function) [as next] (/home/frozendragon/code/application/node_modules/@babel/polyfill/node_modules/regenerator-runtime/runtime.js:97:21)
at asyncGeneratorStep (/home/frozendragon/code/application/src/components/universal/Component.js:4176:103)
at _next (/home/frozendragon/code/application/src/components/universal/Component.js:4178:194)
------------------|----------|----------|----------|----------|-------------------|
File | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s |
------------------|----------|----------|----------|----------|-------------------|
All files | 33.57 | 15 | 35.48 | 34.38 | |
Component.js | 33.57 | 15 | 35.48 | 34.38 |... 65,566,569,574 |
------------------|----------|----------|----------|----------|-------------------|
最简单的测试是验证您可以查询DOM中的特定元素,例如
expect(component.exists('.some-class')).to.equal(true);
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