Function expectUpdates

packages/core/src/SpringContext.test.tsx:35–46

(updates: any[])

    )

    const expectUpdates = (updates: any[]) => {
      onProps.mock.calls.forEach((args, i) => {
        const update = updates[i]
        if (update) {
          expect(args[0]).toMatchObject(update)
        } else {
          // Unexpected update.
          expect(args[0]).toBeUndefined()
        }
      })
      onProps.mockClear()
    }

    const elem = await render(getRoot())
    // React.StrictMode runs the layout effect twice on initial mount