import pytest
from flask import Flask, json
from werkzeug.exceptions import HTTPException, NotFound, InternalServerError
from unittest.mock import patch
from flask import branch_coverage, track_coverage

def create_app():
    app = Flask(__name__)

    @app.route('/success')
    def success():
        track_coverage('dispatch_request_success')
        return 'Success', 200

    @app.route('/error')
    def error():
        track_coverage('dispatch_request_error')
        raise InternalServerError(description='Error occurred')

    @app.route('/not_found')
    def not_found():
        track_coverage('dispatch_request_not_found')
        raise NotFound(description='This is a 404')

    return app

@pytest.fixture
def client():
    app = create_app()
    app.config['TESTING'] = True
    with app.test_client() as client:
        yield client

def test_success_path(client):
    response = client.get('/success')
    assert response.status_code == 200
    assert response.data == b'Success'
    assert branch_coverage['dispatch_request_success']

def test_error_handling(client):
    response = client.get('/error')
    assert response.status_code == 500
    assert 'Error occurred' in response.get_data(as_text=True)
    assert branch_coverage['dispatch_request_error']

def test_not_found_handling(client):
    response = client.get('/not_found')
    assert response.status_code == 404
    assert 'This is a 404' in response.get_data(as_text=True)
    assert branch_coverage['dispatch_request_not_found']

def test_no_route(client):
    response = client.get('/no_route')
    assert response.status_code == 404


def save_coverage_to_json(file_path='coverage_result.json'):
    with open(file_path, 'w') as json_file:
        json.dump(branch_coverage, json_file, indent=4)