How to make a unit test using Flask and Django

Question

I’m new to python testing using Django and flask. Using the pytest library, how would test implementation of the following methods and what could be tested? If someone could give me a light it would help a lot!

import os

from flask import Flask, session, flash, redirect, render_template, request
from src.dao import UserDao

app = Flask(__name__)
secret = os.environ.get('SESSIONKEY')
app.secret_key = secret
user = UserDao()


@app.route('/logout')
def logout():
    session['usuario_logado'] = None
    session.modified = True
    return redirect('/')

@app.route('/autenticar', methods=['POST'])
def autenticar():
    if (user.read(request.form['email'], request.form['senha'])):
        session['usuario_logado'] = user.nome
        session.modified = True
        return redirect('/perfil')
    else:
        flash("Email ou senha incorretos")
        return redirect('/login')

@app.route('/criar', methods=['POST'])
def criar():
    if (user.create(request.form['email'], request.form['nome'], request.form['senha'], request.form['valida_senha'])):
        session['usuario_logado'] = request.form['nome']
        return redirect('/perfil')
    else:
        flash(user.message)
        return redirect('/register')

What I tried to do

def test_logout_page():
    with app.test_client() as test_client:
        response = test_client.get('/logout')
        assert response.status_code == 200
        
        
def test_autenticar_page():
    with app.test_client() as test_client:
        response = test_client.get('/login')
        assert response.status_code == 200
        

def test_criar_page():
    with app.test_client() as test_client:
        response = test_client.get('/register')
        assert response.status_code == 200

Results

In test_logout_page() test it fails:

The other tests pass, but I found it very simple. What would be a way to create a more robust test, like creating a user and validating a request, ending a session on the page and so on?