add and run tests

[todo]

ecs/.github/workflows/test.yaml

Lines 22 to 24 in 9d8215a

	# TODO: add and run tests
	# - run: npm test
	# - run: npx codecov

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This issue was generated by todo based on a TODO comment in 9d8215a. It's been assigned to @thislooksfun because they committed the code.