take_promise

Async IO capture for Gleam tests on JavaScript.

Like take, but accepts callbacks that return Promise(a) and awaits them before returning captured output.

import take_promise
import gleam/javascript/promise

pub fn async_greeting_test() {
  use #(result, output) <- take_promise.with_stdout(fn() {
    io.println("Hello!")
    promise.resolve(42)
  })

  assert 42 == result
  assert "Hello!\n" == output
}

Values

capture_stderr

</>

pub fn capture_stderr(
  f: fn() -> promise.Promise(a),
) -> promise.Promise(String)

Runs f, awaits the returned promise, and returns captured stderr.

capture_stdio

</>

pub fn capture_stdio(
  f: fn() -> promise.Promise(a),
) -> promise.Promise(#(String, String))

Runs f, awaits the returned promise, and returns both captured streams.

capture_stdout

</>

pub fn capture_stdout(
  f: fn() -> promise.Promise(a),
) -> promise.Promise(String)

Runs f, awaits the returned promise, and returns captured stdout.

with_stderr

</>

pub fn with_stderr(
  f: fn() -> promise.Promise(a),
) -> promise.Promise(#(a, String))

Runs f, awaits the returned promise, and captures stderr. Returns a promise of the result and captured output.

with_stdio

</>

pub fn with_stdio(
  f: fn() -> promise.Promise(a),
) -> promise.Promise(#(a, String, String))

Runs f, awaits the returned promise, and captures both stdout and stderr.

with_stdout

</>

pub fn with_stdout(
  f: fn() -> promise.Promise(a),
) -> promise.Promise(#(a, String))

Runs f, awaits the returned promise, and captures stdout. Returns a promise of the result and captured output.