Rails - Dec 2006 - problem with assert_raise in Unit Test

I''m running a simple unit test to validate that ActiveRecord raises an
exception when I try and update a column with a duplicate foreign key.


Inside the unit test,

  charge.time_logs << time_logs(:first)

will generate

ActiveRecord::StatementInvalid: Mysql::Error: #23000Duplicate entry
''20'' for key 2: UPDATE time_logs SET `task_id` = 1,
`date_created` NULL, `time_charge_id` = 20, `hours` = 2.0, `log_entry` = NULL
WHERE id
= 2

However,

     assert_raise ActiveRecord::StatementInvalid do
       charge.time_logs << time_logs(:first)
     end

will generate

<ActiveRecord::StatementInvalid> exception expected but none was
thrown.

What am I doing wrong?


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