I want to write a test that assert a given object does not have certain properties.
Say I have a function
function removeFooAndBar(input) {
delete input.foo;
delete input.bar;
return input;
}
Now I want to write a test:
describe('removeFooAndBar', () => {
it('removes properties `foo` and `bar`', () => {
const data = {
foo: 'Foo',
bar: 'Bar',
baz: 'Baz',
};
expect(removeFooAndBar(data))
.toEqual(expect.objectContaining({
baz: 'Baz', // what's left
foo: expect.not.exists() // pseudo
bar: undefined // this doesn't work, and not what I want
}));
});
});
What's the proper way to do assert this?
from Jest: expect object not to have property
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