Ruby on Rails error on test

I've been developing a website with RoR, I can view it on the browser locally, but when I run 'bundle rake test' I get this error:

1) Error: StaticPagesControllerTest#test_should_get_home: ActiveRecord::RecordNotFound: Couldn't find Datum with 'id'=1 app/controllers/static_pages_controller.rb:3:in home' test/controllers/static_pages_controller_test.rb:5:inblock in '

2) Error: SiteLayoutTest#test_layout_links: ActiveRecord::RecordNotFound: Couldn't find Datum with 'id'=1 app/controllers/static_pages_controller.rb:3:in home' test/integration/site_layout_test.rb:5:inblock in '

I want to display content on my home page. This is the StaticPagesController content

def home @datum = Datum.find(1) end

And this is how I'm displaying the content:

I'll appreciate any help!