[Python] Import error running unittest in Python3

I have a problem importing files in Python 3.6. My directories tree is as given below:

project/
app/
├── __init__.py
├── a.py
└── b.py
test/
├── __init__.py
├── test_a.py
└── test_b.py


It works my application (but, no works the tests) using following import statement in b.py:

from a import *


But, it does not work my application (but, works the tests) using this other in b.py:

from .a import *


So, I choose from a import *. Executing test like python3 -m unittest I always get following error:

E.
======================================================================
ERROR: tests.test_cell (unittest.loader._FailedTest)
----------------------------------------------------------------------
ImportError: Failed to import test module: tests.test_cell
Traceback (most recent call last):
File "/usr/local/Cellar/python3/3.6.1/Frameworks/Python.framework/Versions/3.6/lib/python3.6/unittest/loader.py", line 428, in _find_test_path
module = self._get_module_from_name(name)
File "/usr/local/Cellar/python3/3.6.1/Frameworks/Python.framework/Versions/3.6/lib/python3.6/unittest/loader.py", line 369, in _get_module_from_name
__import__(name)
File "/Users/serrodcal/Repositories/project/tests/test_b.py", line 2, in <module>
from app.b import *
File "/Users/serrodcal/Repositories/project/app/b.py", line 1, in <module>
from a import *
ModuleNotFoundError: No module named 'a'


----------------------------------------------------------------------
Ran 2 tests in 0.001s

FAILED (errors=1)


In this case, my import statement in test_b.py is as given below:

from unittest import TestCase
from app.cell import *


Is there any way to fix this problem?

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