prefer-to-have-length.md

Suggest using toHaveLength() (prefer-to-have-length)

In order to have a better failure message, toHaveLength() should be used upon asserting expectations on objects length property.

Rule details

This rule triggers a warning if toBe(), toEqual() or toStrictEqual() is used to assert objects length property.

The following patterns are considered warnings:

expect(files.length).toBe(1)
expect(files.length).toEqual(1)
expect(files.length).toStrictEqual(1)

The following pattern is not a warning:

expect(files).toHaveLength(1)