testing.shouldError() function

testing.shouldError() calls a function that catches any error and checks that the error matches the expected value.

Function type signature

(fn: () => A, want: regexp) => stream[{v: string}]

Parameters

fn

(Required) Function to call.

want

(Required) Regular expression to match the expected error.

Examples

Test die function errors

import "testing"

testing.shouldError(fn: () => die(msg: "error message"), want: /error message/)