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kotlinlang

I am trying to mock an object I get from a third party library.  Unfortunately, it looks like they are doing something complicated with their object.  When I run the test, I get the following exception:

```Sep 11, 2019 3:48:57 PM io.mockk.impl.log.JULLogger warn
WARNING: Failed to set backing field (skipping)
java.lang.IllegalArgumentException: Can not set com.stripe.model.ExpandableField field com.stripe.model.Customer.defaultSource to java.lang.String```

Is there a way I can get around this?  I just want to return a simple string. :disappointed: