Python json dump and load

How to use json dump and json load from fixtures using tmpdir_factory?

 

We need two separate files

First conftest.py file, and the second test_auhor.py file

#conftest.py

@pytest.fixture(scope="module")
def author_file_json(tmpdir_factory):
    """Write some authors to a data file."""
    python_author_data = {
        'Ned': {'City':'Boston'},
        'Brian': {'City': 'Portland'},
        'Luciano': {'City': 'Sau Paulo'}
    }

    file = tmpdir_factory.mktemp('data').join('author_file.json')
    print(f"file : {str(file)}")

    with open(file, 'w') as fp:
        json.dump(python_author_data, fp)

    return file

#test_author.py

"""Some tests that use temp data files."""

import json

def test_brian_in_portland(author_file_json):
    with author_file_json.open() as f:
        authors = json.load(f)
    
    assert authors['Brian']['City'] == 'Portland'

def test_all_have_cities(author_file_json):
    with open(author_file_json, 'r') as f:
        authors = json.load(f)

    for key in authors:
        assert len(authors[key]['City']) > 0