add coverage runner

Author: bobmyhill

run_coverage.sh

@@ -0,0 +1,29 @@
+#!/bin/bash
+
+# This script runs the test suite and checks that code coverage has not decreased
+# relative to the main branch. It also generates an HTML coverage report.
+
+# Uninstall numba to avoid issues with coverage measurement
+python -m pip install -q -e .[dev]
+python -m pip uninstall -y numba
+
+# Get current coverage
+coverage run -m unittest discover ./tests
+coverage report > new_coverage.tmp
+current_coverage=$(coverage report --precision=7 --format=total)
+echo "Coverage: $current_coverage"
+
+# Generate HTML coverage report
+coverage html -d htmlcov
+
+# Reinstall numba, clean up temporary files
+python -m pip install -q -e .[dev]
+rm new_coverage.tmp
+echo "Numba reinstalled:"
+pip freeze | grep numba
+
+
+# Open the HTML coverage report in the default web browser if on macOS
+if [[ "$OSTYPE" == "darwin"* ]]; then
+  open "htmlcov/index.html"
+fi