chore: tweak tests to work with XBlock==3.0.0

xmodule/modulestore/tests/test_api.py

@@ -46,7 +46,7 @@ def test_get_xblock_root_module_name():
 
     mixed_done_xblock = runtime.construct_xblock_from_class(DoneXBlock, Mock())
 
-    assert mixed_done_xblock.__module__ == 'xblock.internal'  # Mixed classes has a runtime generated module name.
+    assert mixed_done_xblock.__module__ == 'xblock.core'
     assert mixed_done_xblock.unmixed_class == DoneXBlock, 'The unmixed_class property retains the original property.'
 
     assert get_xblock_root_module_name(mixed_done_xblock) == 'done'

xmodule/modulestore/tests/test_inheritance.py

@@ -15,7 +15,7 @@ from xblock.test.tools import TestRuntime
 from xmodule.modulestore.inheritance import InheritanceMixin
 
 
-class TestXBlock:
+class TestXBlock(XBlock):
     """
     An empty Xblock, to be used, when creating a block with mixins.
     """