I have a mapModule where I import components and export them:
import ComponentName from '../components/ComponentName';
export default {
name: ComponentName,
};
How can I test that mapModule has the correct exported keys, values and that they are not null or undefined?
In version 23.3.0 of jest,
expect(string).toMatch(string)
expects a string.
Use:
const expected = { name:'component name' }
const actual = { name: 'component name', type: 'form' }
expect(actual).toMatchObject(expected)
result is passing test
you can use one of those:
toEqual and toMatchObject are template matchers for objects:
let Obj = {name: 'component name', id: 2};
expect(oneObj).toEqual({name: 'component name'}) // false, should be exactly equal all Obj keys and values
expect(oneObj).toMatchObject({name: 'component name'}) // true
or easly use toHaveProperty :
let Obj = {name: 'component name'};
expect(oneObj).toHaveProperty('name') // true
expect(oneObj).toHaveProperty('name', 'component name') // true
Keep in mind that .toMatchObject checks
"that a JavaScript object matches a subset of the properties of an object."
So toMatchObject can have unintended assertions such as:
expect({ a: 1, b: 2 }).toMatchObject({ a: 1 }); // pass
If you do want to match an object exactly, you should use .toStrictEqual, available since jest 23:
expect({ a: 1, b: 2 }).toStrictEqual({ a: 1 }); // fail