requirements-dev.txt

# Development and verification dependencies.
#
# Not installed on Streamlit Community Cloud; the deployed app only ever needs
# requirements.txt. These are for running the test suite and the UX audit
# harness (scripts/ux_audit.py) locally.
#
#   pip install -r requirements-dev.txt
#
# !! REQUIRED SECOND STEP !!
# Playwright ships no browser with the wheel. After installing, download the
# Chromium build the harness drives:
#
#   playwright install chromium
#
# Skipping this leaves every ux_audit.py mode failing at browser launch, which
# looks like a harness bug and is not one.
#
# Pinned exactly, same as requirements.txt: the screenshot baselines in
# tests/baseline/ are only comparable across machines if everyone renders and
# diffs with the same versions.
#
# numpy and pillow already arrive transitively via streamlit/pandas, but
# scripts/uxaudit/imagediff.py imports them directly, so they are declared here
# too. Do not delete them as redundant; a transitive dependency is not a
# contract.
numpy==2.4.6         # pixel maths for the screenshot diff
pillow==12.2.0       # scroll-and-stitch screenshot assembly, diff rendering
playwright==1.60.0   # drives the harness; see "playwright install chromium" above
pytest==9.0.3        # tests/ (8 modules); previously undeclared