Move CWSchemaTC to RQLExpressionTC The test actually doesn't require a cubicweb schema, except for testing EmailAdress which is out of scope of the test (testing RQLExpression.transform_has_permission()). Just move the test in existing RQLExpressionTC inheriting from TestCase and rename the tests to be more explicit.

sync_schema_props_perms('cw_source', syncprops=False)
if schema['BigInt'].eid is None:
    add_entity_type('BigInt')