56 lines
1.8 KiB
TypeScript
56 lines
1.8 KiB
TypeScript
/**
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* @title Writing Effect tests with @effect/vitest
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*
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* Using `it.effect` for Effect-based tests.
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*/
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import { assert, describe, it } from "@effect/vitest"
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import { Effect, Fiber, Schema } from "effect"
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import { TestClock } from "effect/testing"
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describe("@effect/vitest basics", () => {
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it.effect("runs Effect code with assert helpers", () =>
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Effect.gen(function*() {
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const upper = ["ada", "lin"].map((name) => name.toUpperCase())
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assert.deepStrictEqual(upper, ["ADA", "LIN"])
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assert.strictEqual(upper.length, 2)
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assert.isTrue(upper.includes("ADA"))
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}))
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it.effect.each([
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{ input: " Ada ", expected: "ada" },
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{ input: " Lin ", expected: "lin" },
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{ input: " Nia ", expected: "nia" }
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])("parameterized normalization %#", ({ input, expected }) =>
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Effect.gen(function*() {
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assert.strictEqual(input.trim().toLowerCase(), expected)
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}))
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it.effect("controls time with TestClock", () =>
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Effect.gen(function*() {
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const fiber = yield* Effect.forkChild(
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Effect.sleep(60_000).pipe(Effect.as("done" as const))
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)
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// Move virtual time forward to complete sleeping fibers immediately.
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yield* TestClock.adjust(60_000)
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const value = yield* Fiber.join(fiber)
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assert.strictEqual(value, "done")
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}))
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it.live("uses real runtime services", () =>
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Effect.gen(function*() {
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const startedAt = Date.now()
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yield* Effect.sleep(1)
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assert.isTrue(Date.now() >= startedAt)
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}))
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// For property-based testing, use `it.effect.prop` with Schema-based
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// arbitraries
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it.effect.prop("reversing twice is identity", [Schema.String], ([value]) =>
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Effect.gen(function*() {
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const reversedTwice = value.split("").reverse().reverse().join("")
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assert.strictEqual(reversedTwice, value)
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}))
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})
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