jest

To test Roblox Luau modules, use Jest Roblox to structure tests with describe and it blocks, apply expect assertions, and import testing functions explicitly from @rbxts/jest-globals to validate game logic and module behavior.

Jest Roblox accommodates Luau deviations by replacing .not with .never for negated assertions and supporting two-value returns from jest.fn, ensuring the testing framework aligns with Luau syntax and Roblox platform constraints.

Mock dependencies in Roblox Lua integration tests by using jest.fn from Jest Roblox, which returns two values tailored for Luau, allowing you to isolate modules, simulate interactions, and validate function calls within your test suites.

You can use Jest-style expect assertions and custom matchers adapted for Luau rather than standard Jest matchers. Jest Roblox provides these tailored APIs to satisfy Roblox platform constraints, including specific deviations like using .never instead of .not.

Before running Roblox Luau testing, you must install and configure Jest Roblox in your project and use explicit imports from @rbxts/jest-globals to access the required testing APIs, mocks, and assertions for your test suites.