Pytest create fixture with file(s) - app and test

---

examples/pytest/configfile/myapp.py

import json
import os


def _get_config_file():
    return os.environ.get('APP_CONFIG_FILE', 'config.json')

def _read_config():
    config_file = _get_config_file()
    with open(config_file) as fh:
        return json.load(fh)

def app(protocol):
    config = _read_config()
    # ... do stuff based on the config
    address = protocol + '://' + config['host'] + ':' + config['port']

    path = os.path.dirname(_get_config_file())
    outfile = os.path.join(path, 'out.txt')
    with open(outfile, 'w') as fh:
        fh.write(address)

    return address

examples/pytest/configfile/config.json

{"host" : "szabgab.com", "port" : "80"}

examples/pytest/configfile/use_myapp.py

from myapp import app
result = app('https')
print(result)

examples/pytest/configfile/out.txt

https://szabgab.com:80

• Test application

examples/pytest/configfile/test_app.py

import json
import os

from myapp import app

def test_app_one(tmpdir):
    config_file = os.path.join(str(tmpdir), 'conf.json')
    with open(config_file, 'w') as fh:
        json.dump({'host' : 'code-maven.com', 'port' : '443'}, fh)
    os.environ['APP_CONFIG_FILE'] = config_file

    result = app('https')

    assert result == 'https://code-maven.com:443'
    outfile = os.path.join(str(tmpdir), 'out.txt')
    with open(outfile) as fh:
        output_in_file = fh.read()
    assert output_in_file == 'https://code-maven.com:443'


def test_app_two(tmpdir):
    config_file = os.path.join(str(tmpdir), 'conf.json')
    with open(config_file, 'w') as fh:
        json.dump({'host' : 'code-maven.com', 'port' : '443'}, fh)
    os.environ['APP_CONFIG_FILE'] = config_file

    result = app('http')

    assert result == 'http://code-maven.com:443'
    outfile = os.path.join(str(tmpdir), 'out.txt')
    with open(outfile) as fh:
        output_in_file = fh.read()
    assert output_in_file == 'http://code-maven.com:443'