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import { formatServerError } from './format-server-error'
describe('formatServerError', () => {
it('should not append message several times', () => {
const err = new Error(
'Class extends value undefined is not a constructor or null'
)
// Before
expect(err.message).toMatchInlineSnapshot(
`"Class extends value undefined is not a constructor or null"`
)
// After
formatServerError(err)
expect(err.message).toMatchInlineSnapshot(`
"Class extends value undefined is not a constructor or null
This might be caused by a React Class Component being rendered in a Server Component, React Class Components only works in Client Components. Read more: https://nextjs.org/docs/messages/class-component-in-server-component"
`)
// After second
formatServerError(err)
expect(err.message).toMatchInlineSnapshot(`
"Class extends value undefined is not a constructor or null
This might be caused by a React Class Component being rendered in a Server Component, React Class Components only works in Client Components. Read more: https://nextjs.org/docs/messages/class-component-in-server-component"
`)
})
})
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