Flask: Echo GET - testing

import echo_get
import pytest

@pytest.fixture()
def web():
    return echo_get.app.test_client()

def test_main_page(web):
    rv = web.get('/')
    assert rv.status == '200 OK'
    assert '<form action="/echo" method="GET">' in rv.data.decode('utf-8')

def test_echo_no_params(web):
    rv = web.get('/echo')
    assert rv.status == '200 OK'
    assert b"Nothing to say?" == rv.data

def test_echo_no_text(web):
    rv = web.get('/echo?text=')
    assert rv.status == '200 OK'
    assert b"Nothing to say?" == rv.data

def test_echo_text(web):
    rv = web.get('/echo?text=foo+bar')
    assert rv.status == '200 OK'
    assert b"You said: foo bar" == rv.data

pytest