Feature/unit tests

Dockerfile

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+FROM python:3.7
+
+
+ENV PYTHONFAULTHANDLER=1 \
+    PYTHONUNBUFFERED=1 \
+    PYTHONHASHSEED=random \
+    PIP_NO_CACHE_DIR=off \
+    PIP_DISABLE_PIP_VERSION_CHECK=on \
+    PIP_DEFAULT_TIMEOUT=100 \
+    POETRY_VERSION=1.2.1
+
+# System deps:
+RUN pip install "poetry==$POETRY_VERSION"
+
+# Copy only requirements to cache them in docker layer
+WORKDIR /opt/working

docker-compose.yaml

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+version: "3.7"
+
+services:
+  poetry-container:
+    build:
+      context: .
+      dockerfile: Dockerfile
+    image: captainnemo/poetry-container
+    container_name: poetry-container
+    working_dir: /opt/working
+    volumes:
+      - .:/opt/working
+    command:
+      - /bin/bash
+      - -c
+      - |
+        poetry config virtualenvs.create false
+        poetry install
+        tail -F anything