buksy90/chai-exclude

Exclude keys to compare from a deep equal operation with chai expect or assert.

chai-exclude

Exclude keys to compare from a deep equal operation with chai expect or assert.

Why?

Sometimes you'll need to exclude object properties that generate unique values while doing a deep equal operation. This plugin makes it easier to remove those properties from comparison.

chaijs/chai#885

Works with both objects and array of objects with or without circular references.

Installation

npm install chai-exclude --save-dev

yarn add chai-exclude --dev

Usage

Require

const chai = require('chai');
const chaiExclude = require('chai-exclude');

chai.use(chaiExclude);

ES6 Import

import chai from 'chai';
import chaiExclude from 'chai-exclude';

chai.use(chaiExclude);

TypeScript

import * as chai from 'chai';
import chaiExclude from 'chai-exclude';

chai.use(chaiExclude);

// The typings for chai-exclude are included with the package itself.

Examples

All these examples are for JavaScript. If you are using TypeScript and assert, you'll need to deal with strict types. Take a look at the type definition.

a) excluding

1. Excluding a top level property from an object

// Object
assert.deepEqualExcluding({ a: 'a', b: 'b' }, { b: 'b' }, 'a')
assert.deepEqualExcluding({ a: 'a', b: 'b' }, { a: 'z', b: 'b' }, 'a')

expect({ a: 'a', b: 'b' }).excluding('a').to.deep.equal({ b: 'b' })
expect({ a: 'a', b: 'b' }).excluding('a').to.deep.equal({ a: 'z', b: 'b' })

// Array
assert.deepEqualExcluding([{ a: 'a', b: 'b' }], [{ b: 'b' }], 'a')
assert.deepEqualExcluding([{ a: 'a', b: 'b' }], [{ a: 'z', b: 'b' }], 'a')

expect([{ a: 'a', b: 'b' }]).excluding('a').to.deep.equal([{ b: 'b' }])
expect([{ a: 'a', b: 'b' }]).excluding('a').to.deep.equal([{ a: 'z', b: 'b' }])

2. Excluding multiple top level properties from an object

const obj = {
  a: 'a',
  b: 'b',
  c: {
    d: 'd',
    e: 'e'
  }
}

// Object
assert.deepEqualExcluding(obj, { b: 'b' }, ['a', 'c'])
assert.deepEqualExcluding(obj, { a: 'z', b: 'b' }, ['a', 'c'])

expect(obj).excluding(['a', 'c']).to.deep.equal({ b: 'b' })
expect(obj).excluding(['a', 'c']).to.deep.equal({ a: 'z', b: 'b' })

const array = [
  {
    a: 'a',
    b: 'b',
    c: {
      d: 'd',
      e: 'e'
    }
  }
]

// Array
assert.deepEqualExcluding(array, [{ b: 'b' }], ['a', 'c'])
assert.deepEqualExcluding(array, [{ a: 'z', b: 'b' }], ['a', 'c'])

expect(array).excluding(['a', 'c']).to.deep.equal([{ b: 'b' }])
expect(array).excluding(['a', 'c']).to.deep.equal([{ a: 'z', b: 'b' }])

b) excludingEvery

1. Excluding every property in a deeply nested object

const actualObj = {
  a: 'a',
  b: 'b',
  c: {
    a: 'a',
    b: {
      a: 'a',
      d: {
        a: 'a',
        b: 'b',
        d: null
      }
    }
  },
  d: ['a', 'c']
}

const actualArray = [actualObj]

const expectedObj = {
  a: 'z',     // a is excluded from comparison
  b: 'b',
  c: {
    b: {
      d: {
        b: 'b',
        d: null
      }
    }
  },
  d: ['a', 'c']
}

const expectedArray = [expectedObj]

// Object
assert.deepEqualExcludingEvery(actualObj, expectedObj, 'a')
expect(actualObj).excludingEvery('a').to.deep.equal(expectedObj)

// Array
assert.deepEqualExcludingEvery(actualArray, expectedArray, 'a')
expect(actualArray).excludingEvery('a').to.deep.equal(expectedArray)

2. Excluding multiple properties in a deeply nested object

const actualObj = {
  a: 'a',
  b: 'b',
  c: {
    a: 'a',
    b: {
      a: 'a',
      d: {
        a: 'a',
        b: 'b',
        d: null
      }
    }
  },
  d: ['a', 'c']
}

const actualArray = [actualObj]

const expectedObj = {
  b: 'b',
  c: {
    b: {
    }
  }
}

const expectedArray = [expectedObj]

// Object
assert.deepEqualExcludingEvery(actualObj, expectedObj, ['a', 'd'])
expect(actualObj).excludingEvery(['a', 'd']).to.deep.equal(expectedObj)

// Array
assert.deepEqualExcludingEvery(actualArray, expectedArray, ['a', 'd'])
expect(actualArray).excludingEvery(['a', 'd']).to.deep.equal(expectedArray)

Contributing

Contributions are welcome. If you have any questions create an issue here.

License

MIT