Tests are running in dev env

Dockerfile

@@ -1,7 +0,0 @@
-FROM python:alpine AS base
-
-RUN \
-    --mount=type=cache,target=/var/cache/apk \
-    apk add -U make
-
-WORKDIR /app

Makefile

@@ -1,7 +1,19 @@
+SRC := spiff_element_units
+TESTS := tests
+
 DEV_SERVICE := dev
 
+MY_USER := $(shell id -u)
+MY_GROUP := $(shell id -g)
+ME := $(MY_USER):$(MY_GROUP)
+AS_ME := docker compose run -u $(ME) $(DEV_SERVICE)
+
 .PHONY: all
 all: dev-env
 
 dev-env:
 	docker compose build --progress=plain $(DEV_SERVICE)
+
+.PHONY: tests
+tests:
+	$(AS_ME) unittest-parallel -vs $(TESTS) -p test_*.py -t .

dev/Dockerfile

@@ -0,0 +1,13 @@
+FROM python:alpine AS base
+
+RUN \
+    --mount=type=cache,target=/var/cache/apk \
+    apk add -U make
+
+RUN python -m pip install --upgrade pip
+
+WORKDIR /app
+
+COPY dev/requirements.txt .
+
+RUN pip install --no-cache-dir -r requirements.txt

dev/requirements.txt

@@ -0,0 +1 @@
+unittest-parallel == 1.5.3

docker-compose.yml

@@ -2,4 +2,8 @@ services:
   dev:
     container_name: spiff-element-units-dev
     build:
-      dockerfile: Dockerfile
+      context: .
+      dockerfile: dev/Dockerfile
+    volumes:
+      - ./spiff_element_units:/app/spiff_element_units
+      - ./tests:/app/tests

spiff_element_units/__init__.py

@@ -0,0 +1,2 @@
+def this_returns_true():
+    return True

tests/test_sanity.py

@@ -0,0 +1,7 @@
+from unittest import TestCase
+
+from spiff_element_units import this_returns_true
+
+class SanityTest(TestCase):
+    def test_it_returns_true(self):
+        assert this_returns_true()