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'@backstage/frontend-test-utils': patch
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Added a `mountPath` option to `renderInTestApp` that controls the route path pattern the test element is rendered at. When set, the element is wrapped in a `<Route>` with the given path, enabling `useParams()` to extract route parameters from the URL. Use together with `initialRouteEntries` to set a concrete URL that matches the pattern. This is useful for testing page components that depend on URL parameters, such as entity pages that use `useRouteRefParams`.