Rails boolean attribute defaulting to true in tests but shouldn't be

On Rails 4.

Just added an approved? attribute to my article model with default: false

When I went to write an integration test I noticed that in the testing environment the approved? was defaulting to true. To counteract this behavior, I manually added approved: false to the fixtures (articles.yml) file, but feel I shouldn't have to do this.

Is this the correct behavior? Still new to testing.

Here is what my migration looks like:

class AddApprovalToArticles < ActiveRecord::Migration
  def change
    add_column :articles, :approved, :boolean, default: false
    add_column :articles, :approved_at, :datetime
    add_column :articles, :approved_by, :string
  end
end

I recently finished Michael Hartl's Rails Tutorial, in which we added an admin? boolean to the user model. In that case, the fixtures knew to default the value to false.

Thanks for the help, let me know if you need any other specific code of mine.