var R = require('../source');var eq = require('./shared/eq');
describe('modify', function() { it('creates a new object by applying the `transformation` function to the given `property` of the `object`', function() { var object = {name: 'Tomato', elapsed: 100, remaining: 1400}; var expected = {name: 'Tomato', elapsed: 101, remaining: 1400}; eq(R.modify('elapsed', R.add(1), object), expected); });
it('returns the original object if object does not contain the property', function() { var object = {name: 'Tomato', elapsed: 100, remaining: 1400}; eq(R.modify('nonexistent', R.add(1), object), object); });
it('is not destructive', function() { var object = {name: 'Tomato', elapsed: 100, remaining: 1400}; var expected = {name: 'Tomato', elapsed: 100, remaining: 1400}; R.modify('elapsed', R.add(1), object); eq(object, expected); });
it('ignores primitive value transformations', function() { var object = {n: 0, m: 1}; var expected = {n: 0, m: 1}; eq(R.modify('elapsed', 2, object), expected); });
it('ignores null transformations', function() { var object = {n: 0}; var expected = {n: 0}; eq(R.modify('elapsed', null, object), expected); });
it('adjust if `array` at the given key with the `transformation` function', function() { var object = [100, 1400]; var expected = [100, 1401]; eq(R.modify(1, R.add(1), object), expected); });
it('ignores transformations if the input value is not Array and Object', function() { eq(R.modify('a', R.add(1), 42), 42); eq(R.modify('a', R.add(1), undefined), undefined); eq(R.modify('a', R.add(1), null), null); eq(R.modify('a', R.add(1), ''), ''); });
});