effect-io-ai

Package: @effect/vitest
Module: index

index.layer

Share a Layer between multiple tests, optionally wrapping the tests in a describe block if a name is provided.

Signature

declare const layer: <R, E>(layer_: Layer.Layer<R, E>, options?: { readonly memoMap?: Layer.MemoMap; readonly timeout?: Duration.Input; readonly excludeTestServices?: boolean; }) => { (f: (it: Vitest.MethodsNonLive<R>) => void): void; (name: string, f: (it: Vitest.MethodsNonLive<R>) => void): void; }

Source

Since v4.0.0

import { expect, layer } from "@effect/vitest"
import { Effect, Layer, Context } from "effect"

class Foo extends Context.Service("Foo")<Foo, "foo">() {
  static Live = Layer.succeed(Foo, "foo")
}

class Bar extends Context.Service("Bar")<Bar, "bar">() {
  static Live = Layer.effect(
    Bar,
    Effect.map(Foo, () => "bar" as const)
  )
}

layer(Foo.Live)("layer", (it) => {
  it.effect("adds context", () =>
    Effect.gen(function*() {
      const foo = yield* Foo
      expect(foo).toEqual("foo")
    }))

  it.layer(Bar.Live)("nested", (it) => {
    it.effect("adds context", () =>
      Effect.gen(function*() {
        const foo = yield* Foo
        const bar = yield* Bar
        expect(foo).toEqual("foo")
        expect(bar).toEqual("bar")
      }))
  })
})