chai-http not returning xml?

Question

I'm using chai-http to make requests in my tests. But when I set the Accept header to application/xml, suddenly the response body is just {}

Example test:

it('Should return eventlogs as xml', async() => {
const res = await chai.request(baseUrl).get(url).set('Accept', 'application/xml')
expect(res).to.have.status(200)
expect(res.body.toString()).to.include('<ArrayOfEventLog>')
})

expected '[object Object]' to include '<ArrayOfEventLog>'

Does chai-http not support xml?