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x/rambda/assoc.spec.js

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import { assoc } from './assoc'
test('adds a key to an empty object', () => { expect(assoc( 'a', 1, {} )).toEqual({ a : 1 })})
test('adds a key to a non-empty object', () => { expect(assoc( 'b', 2, { a : 1 } )).toEqual({ a : 1, b : 2, })})
test('adds a key to a non-empty object - curry case 1', () => { expect(assoc('b', 2)({ a : 1 })).toEqual({ a : 1, b : 2, })})
test('adds a key to a non-empty object - curry case 2', () => { expect(assoc('b')(2, { a : 1 })).toEqual({ a : 1, b : 2, })})
test('adds a key to a non-empty object - curry case 3', () => { const result = assoc('b')(2)({ a : 1 })
expect(result).toEqual({ a : 1, b : 2, })})
test('changes an existing key', () => { expect(assoc( 'a', 2, { a : 1 } )).toEqual({ a : 2 })})
test('undefined is considered an empty object', () => { expect(assoc( 'a', 1, undefined )).toEqual({ a : 1 })})
test('null is considered an empty object', () => { expect(assoc( 'a', 1, null )).toEqual({ a : 1 })})
test('value can be null', () => { expect(assoc( 'a', null, null )).toEqual({ a : null })})
test('value can be undefined', () => { expect(assoc( 'a', undefined, null )).toEqual({ a : undefined })})
test('assignment is shallow', () => { expect(assoc( 'a', { b : 2 }, { a : { c : 3 } } )).toEqual({ a : { b : 2 } })})