I have an object with many properties and want to check some of them. But one of the fields is a random string so that cannot be checked for an exact match.
const expectedObject = {
a: 'A',
b: 123,
c: ['x', 'y', 'z'],
random: 'dsfgshdfsg'
}
Checking with eql doesn't work due to the random field.
expect(result).to.eql(expectedObject)
Is there a similar method where I can provide an object with only the fields I want to test?
The alternative is to delete the random field for the test, but this is a bit cumbersome.
const resultWithKnownFields = {...result}
delete resultWithKnownFields.random
const expectedObject = {
a: 'A',
b: 123,
c: ['x', 'y', 'z']
}
expect(resultWithKnownFields).to.eql(expectedObject)
expect(result.random.length).to.equal(10)
.containSubset() method of chai-subset plugin.
Partial matching can be performed on the fields in the object.
const { expect } = require('chai');
const chai = require('chai');
const chaiSubset = require('chai-subset');
chai.use(chaiSubset);
describe('69555042', () => {
it('should pass', () => {
const expectedObject = {
a: 'A',
b: 123,
c: ['x', 'y', 'z'],
};
const result = {
a: 'A',
b: 123,
c: ['x', 'y', 'z'],
random: 'dsfgshdfsg',
};
expect(result).to.containSubset(expectedObject);
expect(typeof result.random).to.equal('string');
});
});