Get the unit of measure associated with an iModel (dgn)

[rhaines57]

I believe a Bentley Open Roads .dgn has a unit of measure associated with it.
When that dgn is sync'd to an iTwin/iModel does the unit of measure get saved with the iModel?
If so, is there a way (API call or ECSQL query) to get the units associated with an iModel?

We are using the PresentationManager and I do understand how I can specific the activeUnitSystem to get my display values in a specific units.
My task is to retrieve the actual UOM so I can properly run calculations on the data (which is always in metric) and display the result in the proper UOM.

I see the following paragraph in the Quantity Formatter docs, but I'm not sure where the ui-test-app can be found:

It is possible to retrieve Units from schemas stored in IModels. The new SchemaUnitProvider can now be created and used by the QuantityFormatter or any method in the core-quantity package that requires a UnitsProvider. Below is an example, extracted from ui-test-app, that demonstrates how to register the IModel-specific UnitsProvider as the IModelConnection is created. This new provider will provide access to a wide variety of Units that were not available in the standalone BasicUnitsProvider.

// Provide the QuantityFormatter with the iModelConnection so it can find the unit definitions defined in the iModel
const schemaLocater = new ECSchemaRpcLocater(iModelConnection);
await IModelApp.quantityFormatter.setUnitsProvider (new SchemaUnitProvider(schemaLocater));

Thanks!