How to test path parameters of a GET request with NodeJS's supertest?

I've found examples how to test querry parameters e.g.:

/api/browser?parameter1=2341&parameter2=5663

but I could't find how to parametrize a test if I've a path parameter, an URL like this:

const ENDPOINT_DETAILS = "/api/browser/:parameter";
app.get(ENDPOINT_DETAILS, function (req, res) {

    logger.info("Endpoint called: " + ENDPOINT_DETAILS);
    var details = {}
    // ... magic
    res.send(details);
}

How should my test look like if I don't want to fix my parameter?

describe("returns details", function() {

    it("returns status 200", function(done) {

        var sampleData = "sample_detail";

        // this won't work
        restApi.get('/api/browser/:parameter')
            .set('Accept', 'application/json')
            .expect(200, { "text" : "Detail of " + parameter + " is: " + sample_text})
            .end(function(err, res) {
                if (err) throw err;
                done();
            });

    });
});

Is it possible to know the value of the parameter here, before restApi.get() is called?