const errorMsg = webpackMsg.data.map((s) => stripAnsi(s)).join("\n");

 it('should generate a validator that handles empty input in collection that allows unset input with the given key', () => {
   const validator = contains(['foo', 'bar', 'baz', undefined], {});
   const result = validator('', 'my_key');
   expect(stripAnsi(result as any)).toEqual('my_key must be unset or one of: foo, bar, baz (not empty)');
 });

 this.verifyPrintsNot = (text: string) => {
   const output = stripAnsi(this.process.fullOutput())
   if (new RegExp(text).test(output)) {
     throw new Error(`expected to not find regex '${text}' in '${output}'`)
   }
 }

 this.verifyTestsRun = (count: number) => {
   expect(stripAnsi(this.process.fullOutput())).to.include(
     ` ${count} activities`
   )
 }

const stripped = (a: unknown, b: unknown, options?: DiffOptions) =>
  stripAnsi(diff(a, b, options) || '');

 it('should titleize if wanted', () => {
   const formatter = createTaggedFormatter({ titleize: true });
   const result = formatter({ msg: `Hello!\nThis is a message.\nHere's another.`, level: LOGGER_LEVELS.INFO, logger });
   expect(stripAnsi(result)).toEqual(`[INFO] Hello!\n\n       This is a message.\n       Here's another.`);
 });