Im trying to get my head around the simple test results, to me they look meaninless and can see in the results what is the actual issue. for instance

AggregatorRenderingTestCase->testBlockLinks() failed: Link to href aggregator/sources/1 found

When I look at the "core module" it look correct and now changes have been made to the module

how do I find some more detailed information on the errors and what they mean?