我有一个导航列表项的样式组件,它包装了一个Material-UI列表项,并使用'&&'为了覆盖样式而不使用'!important'标志。
import { ListItem } from 'material-ui/List'
export const StyledNavListItem = withTheme()(styled(ListItem)`
&& {
background: ${props => props.selected
? props.theme.palette.backgrounds.selected
: 'inherit'};
}
`)
它是这样实现的:
export const NavListItem = props => {
return (
<StyledNavListItem selected={props.selected} component={Link} to={props.to || ''} onClick={props.onClick || (() => false)} button>
{props.icon && <ListItemIcon><Icon name={props.icon} /></ListItemIcon>}
<ListItemText primary={props.children || ''} />
</StyledNavListItem>
)
}
但是,当尝试在这里进行单元测试时(使用Jest,酶和jest-styled-components):
it('should change the background color of an item if `props.selected` is truthy', () => {
const navList = mount(
<MuiThemeProvider theme={theme}>
<BrowserRouter>
<Route>
<NavList>
<NavListItem>item text</NavListItem>
<NavListItem selected>item text</NavListItem>
</NavList>
</Route>
</BrowserRouter>
</MuiThemeProvider>
)
expect(navList.find(StyledNavListItem).at(0)).toHaveStyleRule('background', '#e0e0e0')
expect(navList.find(StyledNavListItem).at(1)).toHaveStyleRule('background', theme.palette.backgrounds.selected)
})
我收到错误消息Property not found: "background"
如果我删除&#39;&amp;&amp;&#39;从我的样式包装,测试通过没有问题,但后来我没有得到样式来处理组件。有没有办法达到覆盖块来测试它?
答案 0 :(得分:0)
我找到了一个解决方案 - 通过在material-ui组件中指定自定义类,然后在样式中引用它,它可以使用附加的修改器进行测试
示例强> Typography.style.js
import React from 'react'
import { withTheme } from 'material-ui/styles'
import styled, { css } from 'styled-components'
import Typography from 'material-ui/Typography'
export const StyledTypography = withTheme()(styled(({emphasized, strong, inlined, color, ...other}) => {
return <Typography {...other} classes={{root: 'typography-root'}} />
})`
&.typography-root {
line-height: 1.2em;
${props => !props.variant && css`
font-size: 1em;
`}
${props => props.color && props.theme.palette.typography[props.color] && css`
color: ${props.theme.palette.typography[props.color]};
`}
${props => props.strong && css`
font-weight: 500;
`}
${props => props.emphasized && css`
font-style: italic;
`}
${props => props.inlined && css`
display: inline-block;
`}
}
`)
<强>测试强>
it('does something', () => {
const typography = mount(
<MuiThemeProvider theme={praxisTheme}>
<Typography />
</MuiThemeProvider>
)
expect(typography.find(MaterialUITypography)).toHaveStyleRule('line-height', '1.2em', { modifier: '&.typography-root' })
})