prefer-to-have-length.md

Pattern: Direct length comparison

Issue: -

Description

Using toBe() or toEqual() to check length properties provides less readable error messages. The toHaveLength() matcher is specifically designed for checking array and string lengths with clearer failure output.

Examples

Example of incorrect code:

expect(array.length).toBe(2);
expect(string.length).toEqual(5);
expect(list["length"]).toBe(0);

Example of correct code:

expect(array).toHaveLength(2);
expect(string).toHaveLength(5);
expect(list).toHaveLength(0);