```ruby
require 'spec_helper'
require 'rails_reseed'
require 'yaml'

RSpec.describe 'db:reseed', type: :rake do
  it 'has a task name' do
    expect(task_name).to eq('db:reseed')
    expect(task_name).to eq(subject.name)
  end

  it 'executes its prerequisites rake tasks' do
    expect(subject.prerequisites).to eq(
      ['db:drop', 'db:create', 'db:migrate', 'db:seed']
    )
  end
end
```

Add spec to test message output
user
```ruby
require 'spec_helper'
require 'rails_reseed'
require 'yaml'

RSpec.describe 'db:reseed', type: :rake do
  it 'has a task name' do
    expect(task_name).to eq('db:reseed')
    expect(task_name).to eq(subject.name)
  end

  it 'executes its prerequisites rake tasks' do
    expect(subject.prerequisites).to eq(
      ['db:drop', 'db:create', 'db:migrate', 'db:seed']
    )
  end
  
  it 'outputs a message to indicate successful completion' do
    expect { subject.execute }.to output("Reseeding completed.\n").to_stdout
  end
end
```
assistant