Many of the tests can be called directly from the command line by just using the test name, but this also puts a requirement that the source files have globally unique names. If we add a namespace to the test, then we can avoid this limitation.

For example the cancelable_operation_context_test lives in the db_unittest_test binary, so if we added namespacing, the test would now be invoked via +db_unittest_cancelable_operation_context_test.

The main drawback is the length of the names will become much larger. This may not matter much considering autocomplete features available.