How to check for Map object keys in Jest

Question

Using Jest, I am trying to check for keys in a JavaScript Map object and toHaveProperty does not work. In Mocha/Chai you can assert.hasAllKeys(map, keys)

JavaScript Map: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map

Is there a way to do this?

Answer 1

toHaveProperty is meant for checking paths on a plain javascript object. There aren't any built in matchers (that i'm aware of) that specialize in Map objects, so i'd recommend doing something like this:

expect(myMapObject.has(key)).toEqual(true)