How to access globalstorage of extensionContext in extester?

[jitendra19]

We are storing some information on ExtensionContext's global state. But while writing tests, not able to get context or global state.

In extension, while updating key in globalstate -
context.globalState.update('key', new Date());

and while getting -
context.globalState.get('key');

We want to test whether particular "key" has some value in global state. But seems like there is no option to get extensionContext's globalstate in extester lib.

Is there a way to access global state? TIA.