Dockerfile

FROM python:3.7.2-alpine3.9 as base-env

RUN pip3 install pipenv

COPY Pipfile Pipfile
COPY Pipfile.lock Pipfile.lock

RUN pipenv install --system

COPY ./ /opt/

# ----------- TEST ENV -----------
FROM base-env as test-env

RUN echo "----------------------- PYTEST -----------------------"
RUN pytest
RUN echo "------------------- PYTEST FINISHED -------------------"

WORKDIR /opt/

fooproject-structure

fooproject
  fooproject
    __init__.py
  tests
    __init__.py
  Dockerfile
  Pipfile
  Pipfile.lock

fooproject.__init__.py

def something():
    return 1

Pipfile

[[source]]
url = "https://pypi.org/simple"
verify_ssl = true
name = "pypi"

[dev-packages]

[packages]
pytest = "*"
pytest-aiohttp = "*"
pytest-cov = "*"

[requires]
python_version = "3.7.2"

[pipenv]
allow_prereleases = true

Pipfile.lock

{
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        "pipfile-spec": 6,
        "requires": {
            "python_version": "3.7.2"
        },
        "sources": [
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                "name": "pypi",
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                "verify_ssl": true
            }
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    },
    "develop": {}
}

tests.__init__.py

import pytest

from ..fooproject import something


@pytest.fixture
def num():
    return 1


def test_something(num):
    assert something() == num