Tests

drop.test.js loads the real landing markup, the real assets/js/drop.js and the vendored matter-js into jsdom, clicks the page, and asserts that props spawn, are driven by physics, and come to rest on the type and the arm rather than falling to the floor.

It exists because a refactor once silently deleted start(): the file still parsed, so a syntax check passed, and clicking did nothing.

npm install --no-save jsdom
node test/drop.test.js

Exits non-zero on failure.