Function testUpdates

packages/react-dom/src/__tests__/ReactUpdates-test.js:614–638

(
      components,
      desiredWillUpdates,
      desiredDidUpdates,
    )

    }

    async function testUpdates(
      components,
      desiredWillUpdates,
      desiredDidUpdates,
    ) {
      let i;

      await act(() => {
        for (i = 0; i < components.length; i++) {
          triggerUpdate(components[i]);
        }
      });

      expectUpdates(desiredWillUpdates, desiredDidUpdates);

      // Try them in reverse order

      await act(() => {
        for (i = components.length - 1; i >= 0; i--) {
          triggerUpdate(components[i]);
        }
      });

      expectUpdates(desiredWillUpdates, desiredDidUpdates);
    }
    await testUpdates(
      [
        instance.switcherRef.current.boxRef.current,