In our Salesforce instance we have what was the SteelBricks package installed. On multiple managed package test classes such as AccountVOTests, there are failures because the buisness dicated that we have a validation field on Assets to ensure that the serial number is filled out. When we run the test classes we receive the below errors. With this said how can we handle correcting test classes of a managed package without removing the validation?
System.DmlException: Insert failed. First exception on row 0; first error: FIELD_CUSTOM_VALIDATION_EXCEPTION, Serial Number is mandatory to create and save an Asset. Please enter product serial number: [SerialNumber]