Checkpoint initial implementation

bin/activate.sh

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+source .venv/bin/activate

bin/setup.sh

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+[[ -d .venv ]] && rm -rf .venv
+python -m venv .venv
+source .venv/bin/activate
+pip install --upgrade pip
+pip install -r requirements.txt

bin/test.sh

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+source bin/activate.sh
+pytest tungston -vv $*

bin/watch_test.sh

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+source bin/activate.sh
+watch -c "pytest -q --color=yes --tb=short tungston"