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denoland-deno/tests/unit_node/_test_utils.ts

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// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
import { assert, assertStringIncludes } from "@std/assert";
/** Asserts that an error thrown in a callback will not be wrongly caught. */
export async function assertCallbackErrorUncaught(
{ prelude, invocation, cleanup }: {
/** Any code which needs to run before the actual invocation (notably, any import statements). */
prelude?: string;
/**
* The start of the invocation of the function, e.g. `open("foo.txt", `.
* The callback will be added after it.
*/
invocation: string;
/** Called after the subprocess is finished but before running the assertions, e.g. to clean up created files. */
cleanup?: () => Promise<void> | void;
},
) {
// Since the error has to be uncaught, and that will kill the Deno process,
// the only way to test this is to spawn a subprocess.
const p = new Deno.Command(Deno.execPath(), {
args: [
"eval",
`${prelude ?? ""}
${invocation}(err) => {
// If the bug is present and the callback is called again with an error,
// don't throw another error, so if the subprocess fails we know it had the correct behaviour.
if (!err) throw new Error("success");
});`,
],
stderr: "piped",
});
const { stderr, success } = await p.output();
const error = new TextDecoder().decode(stderr);
await cleanup?.();
assert(!success);
assertStringIncludes(error, "Error: success");
}