Rake problem -- overriding test task

I’ve got a test suite that runs fine from the command line but fails
from rake. We’ve got a database table in our app that causes
db:test:clone to fail. From the command line, db:test:clone_structure
works ok, so I tried to override db:test:clone in the Rakefile. When I
‘rake test’, the unit tests run successfully, but the integration tests
all fail (they all run successfully from the command line). I’ll copy
the Rakefile below. If anybody’s got any ideas about what I might be
doing wrong, I’d really appreciate hearing them.

Thanks,
Bill

======== Rakefile =========
require(File.join(File.dirname(FILE), ‘config’, ‘boot’))

require ‘rake’
require ‘rake/testtask’
require ‘rake/rdoctask’
require ‘tasks/rails’

don’t clone the test database; use clone_structure

so Rake doesn’t abort on the fulltext index

Rake::TaskManager.class_eval do
def delete_task(task_name)
@tasks.delete(task_name.to_s)
end
Rake.application.delete_task(“db:test:clone”)
end
namespace :db do
namespace :test do
task :clone do
Rake::Task[“db:test:clone_structure”].invoke
end
end
end