diff --git a/Dockerfile.python:3.9.9-slim-bullseye b/Dockerfile.python:3.9.9-slim-bullseye
index b14f990..ddc599f 100755
--- a/Dockerfile.python:3.9.9-slim-bullseye
+++ b/Dockerfile.python:3.9.9-slim-bullseye
@@ -14,5 +14,7 @@ RUN pip install -r requirements.txt
 # Add the python app to the image
 COPY app.py .
 
+RUN pytest1 app.py
+
 # The next line says "app:api" and not "app:app" !
 CMD ["uvicorn", "app:api", "--host", "0.0.0.0", "--port", "8000"]
diff --git a/docker-compose.yml b/docker-compose.yml
index 7440737..0537bc8 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -27,3 +27,12 @@ services:
       - .:/usr/src/app/
     ports:
     - 8039:8000
+  app-3.9-full:
+    image: app:3.9.9-slim-bullseye
+    build:
+      context: . 
+      dockerfile: Dockerfile.python:3.9.9-bullseye
+    volumes:
+      - .:/usr/src/app/
+    ports:
+    - 8039:8000
\ No newline at end of file
diff --git a/requirements.txt b/requirements.txt
index 24da44e..0979aaf 100755
--- a/requirements.txt
+++ b/requirements.txt
@@ -8,5 +8,6 @@ typing_extensions==4.7.1
 uvicorn==0.22.0
 
 # # Needed for PyTest, used in test_app.py
+pytest
 # httpx==0.26.0
 # requests==2.31.0