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Function: noneValue()

noneValue<T>(): Arbitrary<Option<T>>

Defined in: testing/arbitraries/option.ts:108

Generate only None values.

Useful when you want to test behavior with guaranteed absence.

Type Parameters​

T​

T = never

Returns​

Arbitrary<Option<T>>

Arbitrary that always generates None

Example​

import * as fc from 'fast-check'
import { noneValue } from 'receta-test/arbitraries'

const noneArb = noneValue<number>()

fc.assert(
  fc.property(noneArb, (opt) => {
    expect(opt._tag).toBe('None')
  })
)