hilla-ui-test

Writes the UI layer tests of a use case (UC-XXX) for Hilla React views with Vitest in browser mode and React Testing Library, with the generated endpoint clients mocked by vi.spyOn — no server, no database. Covers what the actor sees: rendering, form input and useForm validation, the calls the view makes to the endpoint, and the messages the specification states for every outcome and alternative flow. Each suite is UC-XXX-<slug>.test.tsx with describe('UC-XXX: <name>'). Use when the user asks to "test the Hilla view of UC-001", "write Vitest tests for a Hilla view", "test a React view for Vaadin", "test the UI layer", or mentions Hilla testing, endpoint mocking, or TSX view tests in a project that combines layer plugins. Normally run by /use-case-test after the service tests; it can be run directly. Also writes a Java test of the endpoint's access annotation and EndpointException messages. The business rules are tested by the integration layer's test skill.