Ensure expect()
is called with a single argument and there is an actual
expectation made.
This rule triggers a warning if expect()
is called with more than one argument
or without arguments. It would also issue a warning if there is nothing called
on expect()
, e.g.:
expect();
expect('something');
or when a matcher function was not called, e.g.:
expect(true).toBeDefined;
This rule is enabled by default.
The following patterns are considered warnings:
expect();
expect().toEqual('something');
expect('something', 'else');
expect('something');
expect(true).toBeDefined;
expect(Promise.resolve('hello')).resolves;
The following patterns are not warnings:
expect('something').toEqual('something');
expect([1, 2, 3]).toEqual([1, 2, 3]);
expect(true).toBeDefined();
expect(Promise.resolve('hello')).resolves.toEqual('hello');