Test Class – Error: Compile Error: Field is not writeable: Opportunity.ConnectionReceivedId

I have a re-parenting trigger that fires if the connectionReceivedId is of a certain value. The sad part is that it looks like that field is not writeable, so testing is not possible. I know I could rewrite the trigger to work around this, but I would enjoy being able to actually sort records needing re-parenting by the connection from which they were received.

Directly attributable code coverage?

Since the last release, when I execute a single unit test (via Develop > Apex Classes > Test Class > Run Test), I get taken to the “Apex Test Execution” screen. This screen shows whether the test passed or failed, but not the line coverage directly attributable to this unit test.