======================================================================
ERROR: test_duplicate_table_error (backends.tests.BackendTestCase)
Creating an existing table returns a DatabaseError
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Traceback (most recent call last):
  File "/home/tim/code/django/django/test/testcases.py", line 274, in __call__
    self._post_teardown()
  File "/home/tim/code/django/django/test/testcases.py", line 1009, in _post_teardown
    self._fixture_teardown()
  File "/home/tim/code/django/django/test/testcases.py", line 1044, in _fixture_teardown
    inhibit_post_migrate=inhibit_post_migrate)
  File "/home/tim/code/django/django/core/management/__init__.py", line 148, in call_command
    return command.execute(*args, **defaults)
  File "/home/tim/code/django/django/core/management/base.py", line 364, in execute
    output = self.handle(*args, **options)
  File "/home/tim/code/django/django/core/management/commands/flush.py", line 49, in handle
    allow_cascade=allow_cascade)
  File "/home/tim/code/django/django/core/management/sql.py", line 13, in sql_flush
    tables = connection.introspection.django_table_names(only_existing=True, include_views=False)
  File "/home/tim/code/django/django/db/backends/base/introspection.py", line 78, in django_table_names
    existing_tables = set(self.table_names(include_views=include_views))
  File "/home/tim/code/django/django/db/backends/base/introspection.py", line 47, in table_names
    return get_names(cursor)
  File "/home/tim/code/django/django/db/backends/base/introspection.py", line 43, in get_names
    return sorted(ti.name for ti in self.get_table_list(cursor)
  File "/home/tim/code/spanner-django/spanner/django/introspection.py", line 27, in get_table_list
    return [TableInfo(row[0], 't') for row in cursor.list_tables()]
  File "/home/tim/code/spanner-django/spanner/dbapi/autocommit_on_cursor.py", line 272, in list_tables
    return self.__db_handle.list_tables()
  File "/home/tim/code/spanner-django/spanner/dbapi/autocommit_on_connection.py", line 99, in list_tables
    """)
  File "/home/tim/code/spanner-django/spanner/dbapi/autocommit_on_connection.py", line 104, in run_sql_in_snapshot
    self.run_prior_DDL_statements()
  File "/home/tim/code/spanner-django/spanner/dbapi/autocommit_on_connection.py", line 89, in run_prior_DDL_statements
    return self.__handle_update_ddl(ddl_statements)
  File "/home/tim/code/spanner-django/spanner/dbapi/autocommit_on_connection.py", line 64, in __handle_update_ddl
    return self.__dbhandle.update_ddl(ddl_statements).result()
  File "/home/tim/.virtualenvs/django37/lib/python3.7/site-packages/google/api_core/future/polling.py", line 127, in result
    raise self._exception
google.api_core.exceptions.GoogleAPICallError: None Duplicate name in schema: backends_article.

======================================================================
FAIL: test_duplicate_table_error (backends.tests.BackendTestCase)
Creating an existing table returns a DatabaseError
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Traceback (most recent call last):
  File "/home/tim/code/django/tests/backends/tests.py", line 350, in test_duplicate_table_error
    cursor.execute(query)
AssertionError: DatabaseError not raised