1/**
2 * @title Writing Effect tests with @effect/vitest
3 *
4 * Using `it.effect` for Effect-based tests.
5 */
6import { assert, describe, it } from "@effect/vitest"
7import { Effect, Fiber, Schema } from "effect"
8import { TestClock } from "effect/testing"
9
10describe("@effect/vitest basics", () => {
11 it.effect("runs Effect code with assert helpers", () =>
12 Effect.gen(function*() {
13 const upper = ["ada", "lin"].map((name) => name.toUpperCase())
14 assert.deepStrictEqual(upper, ["ADA", "LIN"])
15 assert.strictEqual(upper.length, 2)
16 assert.isTrue(upper.includes("ADA"))
17 }))
18
19 it.effect.each([
20 { input: " Ada ", expected: "ada" },
21 { input: " Lin ", expected: "lin" },
22 { input: " Nia ", expected: "nia" }
23 ])("parameterized normalization %#", ({ input, expected }) =>
24 Effect.gen(function*() {
25 assert.strictEqual(input.trim().toLowerCase(), expected)
26 }))
27
28 it.effect("controls time with TestClock", () =>
29 Effect.gen(function*() {
30 const fiber = yield* Effect.forkChild(
31 Effect.sleep(60_000).pipe(Effect.as("done" as const))
32 )
33
34 // Move virtual time forward to complete sleeping fibers immediately.
35 yield* TestClock.adjust(60_000)
36
37 const value = yield* Fiber.join(fiber)
38 assert.strictEqual(value, "done")
39 }))
40
41 it.live("uses real runtime services", () =>
42 Effect.gen(function*() {
43 const startedAt = Date.now()
44 yield* Effect.sleep(1)
45 assert.isTrue(Date.now() >= startedAt)
46 }))
47
48 // For property-based testing, use `it.effect.prop` with Schema-based
49 // arbitraries
50 it.effect.prop("reversing twice is identity", [Schema.String], ([value]) =>
51 Effect.gen(function*() {
52 const reversedTwice = value.split("").reverse().reverse().join("")
53 assert.strictEqual(reversedTwice, value)
54 }))
55})