nounder/effect-testing
claude/skills/effect-testing/SKILL.md
Use when writing tests for Effect.ts code
$ install --global
skillsauthnpx skillsauth add nounder/dotfiles effect-testingInstall this skill globally with one command. Works with Claude Code, Cursor, and Windsurf.
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TrivyContainer and dependency vulnerability scanner
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Last scanned: Apr 9, 2026, 2:27 AM46.6s1 file scanned
SKILL.md
- name:
- effect-testing
- description:
- Use when writing tests for Effect.ts code
Error Testing
test.it("should fail with ValidationError", async () => {
const program = Effect.gen(function* () {
const result = yield* Effect.exit(operation("invalid"))
if (result._tag === "Failure") {
test.expect(ValidationError.isValidationError(result.cause)).toBe(true)
const error = result.cause as ValidationError
test.expect(error.field).toBe("input")
} else {
test.fail("Expected operation to fail")
}
})
await Effect.runPromise(program)
})
Time-sensitive Testing
import * as TestClock from "effect/TestClock"
test.it("should handle delay", async () => {
const program = Effect.gen(function* () {
const fiber = yield* Effect.fork(
Effect.gen(function* () {
yield* Effect.sleep("5 seconds")
return "completed"
}),
)
// Advance test clock (not wall clock)
yield* TestClock.adjust("5 seconds")
const result = yield* Effect.Fiber.join(fiber)
return result
})
const result = await Effect.runPromise(program)
test.expect(result).toBe("completed")
})
Commands
tsc # Type check
bun test <file> # Test specific file
bun test # All tests
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