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webhook/node_modules/eslint-plugin-jest/docs/rules/prefer-to-contain.md
Joel Male 1ada95e04a
v2.0.0 (#12) 
- Convert project to Javascript/Typescript
- Allow custom headers to be passed in (optional)
- Allow body to be optional
2020-08-26 10:52:47 +10:00

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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(), toEqual() or toStrictEqual() 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);

Default configuration

The following patterns are considered warnings:

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

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

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

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

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

The following patterns are not considered warnings:

expect(a).toContain(b);

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