wrestlingdev.com/test/models/school_test.rb

require 'test_helper'

class SchoolTest < ActiveSupport::TestCase
  # test "the truth" do
  #   assert true
  # end
  
  test "School validations" do
    school = School.new
    assert_not school.valid?
    assert_equal [:name], school.errors.attribute_names
  end
  
end