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* Arbitraries for basic effect-ts datatypes.
* @module
*/
import {
Array as AR,
Cause as CA,
Either as EI,
flow,
List as LI,
Option as OP,
pipe,
String as STR,
} from 'effect'
import fc from 'fast-check'
import {Monad as arbitraryMonad} from './instances.js'
const {map, flatMap} = arbitraryMonad
/**
* Returns an `Either` arbitrary given a pair of arbitraries for the underlying
* left and right values.
* @category arbitraries
*/
export const either = <A, E>(
left: fc.Arbitrary<E>,
right: fc.Arbitrary<A>,
): fc.Arbitrary<EI.Either<A, E>> =>
fc.oneof(
right.map<EI.Either<A, E>>(EI.right),
left.map<EI.Either<A, E>>(EI.left),
)
/**
* Returns an `Option` arbitrary given an arbitrary for the underlying value.
* @category arbitraries
*/
export const option = <A>(a: fc.Arbitrary<A>): fc.Arbitrary<OP.Option<A>> =>
fc.oneof(pipe(a, map(OP.some)), fc.constant(OP.none<A>()))
/**
* An integer arbitrary small enough so that we can avoid having to think about
* numeric overflows in generated functions.
* @category arbitraries
*/
export const tinyInteger: fc.Arbitrary<number> = fc.integer({
min: -100,
max: 100,
})
/**
* A non-negative integer arbitrary small enough so that we can avoid having to
* think about numeric overflows in generated functions.
* @category arbitraries
*/
export const tinyNonNegative: fc.Arbitrary<number> = fc.integer({
min: 0,
max: 100,
})
/**
* A arbitrary for a tiny, possibly empty, string.
* @category arbitraries
*/
export const tinyString: fc.Arbitrary<string> = fc.string({
minLength: 0,
maxLength: 3,
})
/**
* An integer in the range 1…100.
* @category arbitraries
*/
export const tinyPositive: fc.Arbitrary<number> = fc.integer({
min: 1,
max: 100,
})
/**
* An array of tiny integers with max size fixed at 4.
* @category arbitraries
*/
export const tinyArray = <A>(a: fc.Arbitrary<A>): fc.Arbitrary<A[]> =>
fc.array(a, {maxLength: 4})
/**
* An array of tiny integers with max size fixed at 4.
* @category arbitraries
*/
export const tinyIntegerArray: fc.Arbitrary<readonly number[]> =
tinyArray(tinyInteger)
/**
* Build an arbitrary error from an arbitrary of a message.
* @param message Arbitrary for the error message string.
* @returns Arbitrary error.
* @category arbitraries
*/
export const error: (message: fc.Arbitrary<string>) => fc.Arbitrary<Error> =
map(s => new Error(s))
/**
* Build an arbitrary record with arbitrary string keys and
* values built from the given arbitrary.
* @param value Arbitrary for the record values.
* @returns Arbitrary record.
* @category arbitraries
*/
export const stringKeyRecord = <T>(value: fc.Arbitrary<T>) =>
pipe(
uniqueStrings,
flatMap(
flow(
AR.map(key => [key, value] as const),
Object.fromEntries,
fc.record,
),
),
) as fc.Arbitrary<Record<string, T>>
const uniqueStrings = fc.uniqueArray(
fc.string({
minLength: 1,
maxLength: 5,
}),
{
minLength: 1,
maxLength: 5,
comparator: STR.Equivalence,
},
)
/**
* Lift an arbitrary into an arbitrary for the effect-ts linked-list `List`
* type.
* @category arbitraries
*/
export const list = <A>(a: fc.Arbitrary<A>): fc.Arbitrary<LI.List<A>> =>
tinyArray(a).map(LI.fromIterable)
/**
* Arbitrary [Cause](https://effect-ts.github.io/effect/effect/Cause.ts.html).
* @category arbitraries
*/
export const cause = <A>(
a: fc.Arbitrary<A>,
defect: fc.Arbitrary<unknown> = tinyInteger,
): fc.Arbitrary<CA.Cause<A>> => {
const depthIdentifier = fc.createDepthIdentifier()
return fc.letrec<{
atomic: CA.Cause<A>
composed: CA.Cause<A>
cause: CA.Cause<A>
}>(tie => ({
cause: fc.oneof(
{maxDepth: 3, depthIdentifier},
tie('atomic'),
tie('composed'),
),
composed: map(
fc.tuple(
fc.oneof(
fc.constant('sequential' as const),
fc.constant('parallel' as const),
),
fc.tuple(tie('cause'), tie('cause')),
),
([op, pair]) => CA[op](...pair),
),
atomic: fc.oneof(
fc.constant(CA.empty),
map(defect, CA.die),
map(a, CA.fail),
),
})).cause
}
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