packages/expect-more-jasmine/src/to-have-empty-object.ts
import { isEmptyObject } from 'expect-more';
import { printExpected } from 'jest-matcher-utils';
import { getIn } from './lib/get-in';
declare global {
namespace jasmine {
// eslint-disable-next-line @typescript-eslint/no-unused-vars
interface Matchers<T> {
/**
* Asserts that a value is a valid `Object` containing no instance members.
* @example
* expect({ child: { grandchild: {} } }).toHaveEmptyObject('child.grandchild');
*/
toHaveEmptyObject(propPath: string): boolean;
}
}
}
export const toHaveEmptyObjectMatcher: jasmine.CustomMatcherFactory = () => {
return {
compare(value: unknown, propPath: string) {
const pass = isEmptyObject(getIn(propPath.split('.'), value));
const message = pass
? `expected value at '${printExpected(propPath)}' not to be an empty object`
: `expected value at '${printExpected(propPath)}' to be an empty object`;
return { message, pass };
},
};
};
beforeAll(() => {
jasmine.addMatchers({
toHaveEmptyObject: toHaveEmptyObjectMatcher,
});
});