minimal logging insert statement on non clustered index table

I understand that minimal logging can occur on a non clustered indexed heap as long as 

http://technet.microsoft.com/en-us/library/ms190422(v=sql.105).aspx

*not replicated

*tablock is used

*table is empty

The following test seems to contradict this

In the test I create a non indexed heap, insert some record and check the log, then repeat the test on an indexed heap.

The results suggest that even though the conditions for minimal logging into a indexed heap are met, minimal logging is not happening although it does happen on an non indexed heap. What am I doing wrong?

CREATE DATABASE logtest

GO

USE logtest

GO

CREATE TABLE test (field varchar(100))

GO

CHECKPOINT

GO

INSERT INTO logtest.dbo.test WITH (TABLOCK)
SELECT TOP 100000 a.name
FROM logtest.sys.columns a
CROSS JOIN logtest.sys.columns b
CROSS JOIN logtest.sys.columns c
CROSS JOIN logtest.sys.columns d


SELECT SUM([Log Record Length]) log_size,COUNT(*) record_count FROM fn_dblog(NULL, NULL)

GO

TRUNCATE TABLE test


CREATE INDEX i ON test (field)
GO

CHECKPOINT

GO

INSERT INTO logtest.dbo.test WITH (TABLOCK)
SELECT TOP 100000 a.name
FROM logtest.sys.columns a
CROSS JOIN logtest.sys.columns b
CROSS JOIN logtest.sys.columns c
CROSS JOIN logtest.sys.columns d


SELECT SUM([Log Record Length]) log_size,COUNT(*) record_count FROM fn_dblog(NULL, NULL)


GO
USE master
GO
DROP DATABASE logtest