CODEWITHSUNDEEP
javascripttypescriptmocha.jschai
Alan Knap
Alan Knap

Reputation: 29

Chaijs - assert multiple keys and values in object

I am rewriting some tests and I have a question. Lets say that I have an object with 10 key/value pairs. Some values are strings and some are numbers.

What I do not want to do is check every key/value separately but rather check all strings and numbers together.

So is there a better way to do this:

expect(a).to.have.property(“b”).that.is.a(“string”).and.not.empty;
expect(a).to.have.property(“c”).that.is.a(“string”).and.not.empty;
expect(a).to.have.property(“d”).that.is.a(“number”);
expect(a).to.have.property(“e”).that.is.a(“number”);

I would like to group the first two and last two in one assertion. Is this doable?

Many thanks!

Upvotes: 0

Views: 399

Answers (1)

jsejcksn
jsejcksn

Reputation: 33730

You can use Array.prototype.every() with the assert function, like in this example code:

TS Playground

import {assert} from 'chai';

const a = {
  b: 'hello',
  c: 'world',
  d: 1,
  e: 2,
};

// The property names which correspond to the string values:
const strProps: (keyof typeof a)[] = ['b', 'c' /* etc. */];

assert(
  strProps.every(key => (
    key in a
    && typeof a[key] === 'string'
    && (a[key] as string).length > 0
  )),
  'Your string property error message here',
);

// The property names which correspond to the number values:
const numProps: (keyof typeof a)[] = ['d', 'e' /* etc. */];

assert(
  numProps.every(key => key in a && typeof a[key] === 'number'),
  'Your number property error message here',
);

Upvotes: 1

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