def test_load_values_from_json_file(mock_exists, mock_open):
mock_exists.return_value = True
json_string = '{"host": "127.0.0.1", "port": 3333,\
"database": "test1", "user": "******",\
"password":"******"}'
mock_open.return_value = ContextualStringIO(json_string)
config = Config()
config.load_json()
# when you load a json file, the values in the json file
# must ovewrite the actual values in the object.
assert config.is_valid
assert config.host == '127.0.0.1'
assert config.port == 3333
assert config.database == 'test1'
assert config.user == 'cat'
assert config.password == 'free'
def test_config_from_json_file(mock_exists, mock_open):
mock_exists.return_value = False
# 1 - trying to load a nonexistent file
config = Config()
config.load_json()
assert not config.is_valid
mock_exists.return_value = True
# 2 - Load a INVALID JSON File
mock_open.return_value = ContextualStringIO('')
config = Config()
config.load_json()
assert not config.is_valid
# 3 - Load a JSON File with a missing `password` property
mock_open.return_value = ContextualStringIO('{"database": "database"}')
config = Config()
config.load_json()
assert not config.is_valid
# 4 - Load a JSON File with a missing `database` property
mock_open.return_value = ContextualStringIO('{"password": "******"}')
config = Config()
config.load_json()
assert not config.is_valid
# # 5 - Load a minimun configuration from a JSON file
# # Virtual JSON file content
json_string = '{"database": "database", "password": "******"}'
mock_open.return_value = ContextualStringIO(json_string)
config = Config()
config.load_json()
assert config.is_valid
