Not migrated:
  + testERP5Site: Checks Site creation and overrides setUp().
  + testERP5TypeInterfaces: Verifies that classes implements the Interfaces they claim to implement.
    => Should probably be integrated into coding style Unit Tests and done
       dynamically (MRO). Also, testERP5Interfaces imports code from that
       Unit Test and requires non-core bt5 to be installed.
  + testInvalidationBug: To-do (failing).
  + testPredicate: testDomainTool, inheriting from TestPredicateMixin, should be rewritten to not
    depend on erp5_apparel so that it can be moved to erp5_core_test.

Also, move manuallyInstallBusinessTemplate() and uninstallBusinessTemplate() from
ERP5TypeCommandLineTestCase to ERP5TypeTestCaseMixin as they are also used by
Live Unit Tests.