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# 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. ```js expect(files.length).toBe(1); ``` This rule is enabled by default. ### Default configuration The following patterns are considered warnings: ```js expect(files.length).toBe(1); expect(files.length).toEqual(1); expect(files.length).toStrictEqual(1); ``` The following pattern is not warning: ```js expect(files).toHaveLength(1); ```