withTheme

function in meocord/testing Since 4.1.0

withTheme<T>(theme: DeepReadonly<MeoCordTheme> | RootTheme, fn: () => T): T

Runs fn with theme as the theme of the call, as a handler's call runs.

Use it for a service or presenter tested without a testing module: useTheme() in fn, and in everything it awaits or starts, reads theme.

Parameters

Name	Type	Description
`theme`	`DeepReadonly<MeoCordTheme> \| RootTheme`	A theme `createMockTheme` made, used as it is, or the roles to change, merged over the defaults as `createMockTheme` merges them.
`fn`	`() => T`	The code to run.

Returns

What fn returns, a promise included.

Throws

Error naming each token that is not valid.

Examples

TypeScript

import { expect } from 'vitest'

const saved = (what: string) => `${useTheme().emojis.success} ${what} saved`
expect(withTheme({ emojis: { success: '🎉' } }, () => saved('Profile'))).toBe('🎉 Profile saved')