Testing Roblox games Make code testable first - Keep game rules in pure ModuleScripts (inputs → outputs, no services, no yields): damage formulas, inventory operations, shop pricing, state machines, serialization, validation. These are trivially testable. - Services take their dependencies as parameters ( dependency injection ) so tests can pass fakes instead of real DataStores, remotes, or . Jest Lua (recommended framework) Port of Jest ( / / , mocks, snapshots). TestEZ is legacy; Jest Lua 3 includes a migration guide. - Put a ( ) in each test root. - Runner script (Studio command bar, a tes…