Best way to test Flask endpoint that return json responses

Question

I'm learning testing with pytest and I'm working on a flask application where I'd like to integrate what I'm learning into. How would you test for a success response and maybe also that the data it returns is what is expected?

# sample Flask app - main.py

from flask import Flask
from flask import escape
import json

app = Flask(__name__)

app.route("/")
def some_route():

    return {"success": True}, 200, {"Content-Type: application/json"}

Test file

from unittest.mock import Mock
import json
import main

def test_some_route():
    assert "success" in main.some_route()[0]