Fix Selenium tests in Codespaces

.devcontainer/Dockerfile

@@ -1,4 +1,4 @@
-FROM mcr.microsoft.com/devcontainers/python:1-3.11-bullseye
+FROM mcr.microsoft.com/devcontainers/python:1-3.11-bookworm
 
 COPY requirements.txt /tmp/requirements.txt
 
@@ -11,6 +11,8 @@ RUN rm -f /etc/apt/sources.list.d/yarn.list \
             xvfb \
         && break || { echo "apt-get attempt $i failed, retrying..."; sleep 5; }; \
     done \
+    && ln -sf /usr/bin/chromium /usr/bin/google-chrome \
+    && ln -sf /usr/bin/chromium /usr/bin/chrome \
     && apt-get clean \
     && rm -rf /var/lib/apt/lists/*
 

README.md

@@ -16,6 +16,8 @@ The setup will automatically:
 - Install a Jupyter kernel named `Python (AIForTesters)`
 - Forward app and notebook ports
 
+If you already had a Codespace open before this setup changed, rebuild the container so the browser packages are refreshed.
+
 ## Start The Flask App
 
 ```bash
@@ -29,7 +31,7 @@ Open the forwarded port `5000` when prompted.
 Run tests in headless mode (recommended in Codespaces):
 
 ```bash
-pytest tests --headless
+python -m pytest tests/ -v --browser=chrome --headless --no-sandbox --disable-gpu
 ```
 
 ## Use Jupyter Notebooks