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Function: someValue()

someValue<T>(valueArb): Arbitrary<Option<T>>

Defined in: testing/arbitraries/option.ts:83

Generate only Some values.

Useful when you want to test behavior with guaranteed present values.

Type Parameters​

T​

T

Parameters​

valueArb​

Arbitrary<T>

Arbitrary for generating Some values

Returns​

Arbitrary<Option<T>>

Arbitrary that always generates Some values

Example​

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

const someArb = someValue(fc.integer())

fc.assert(
  fc.property(someArb, (opt) => {
    expect(opt._tag).toBe('Some')
    expect(typeof opt.value).toBe('number')
  })
)