Suggest using `toContain()` (prefer-to-contain)

In order to have a better failure message, toContain() should be used upon asserting expectations on an array containing an object.

Rule details

This rule triggers a warning if toBe() or isEqual() is used to assert object inclusion in an array

expect(a.includes(b)).toBe(true);

expect(a.includes(b)).not.toBe(true);

expect(a.includes(b)).toBe(false);

The following patterns are considered a warning:

expect(a.includes(b)).toBe(true);

expect(a.includes(b)).not.toBe(true);

expect(a.includes(b)).toBe(false);

The following patterns are not a warning:

expect(a).toContain(b);

expect(a).not.toContain(b);