Can only call expect.extend(..) once as it overwrites the proxy's custom extend #72
Description
Bug
packageversion: v1.1.3nodeversion: 14.21.3npm(oryarn) version: 6.14.18jestversion: 26.6.2
Relevant code or config
expect.extend({
toBe1(received) {
const pass = received === 1;
return pass
? { pass, message: () => `expected ${received} to be 1` }
: { pass, message: () => `expected ${received} not to be 1` };
}
});
expect.extend({
toBe2(received) {
const pass = received === 2;
return pass
? { pass, message: () => `expected ${received} to be 2` }
: { pass, message: () => `expected ${received} not to be 2` };
}
});
console.log(expect['toBe1'], expect['toBe2']);
// [Function (anonymous)] undefinedWhat happened (please provide anything you think will help):
Thanks for the library!
The problem is at https://github.com/mattphillips/jest-expect-message/blob/main/src/withMessage.js#L92.
expectProxy = Object.assign(expectProxy, expect); overwrites expectProxy.extend with expect.extend.
It could be fixed by changing the line to:
for (const key of expect) {
if (key !== 'extend') { // or !(key in eventProxy)
expectProxy[key] = expect[key];
}
}