Home Rails testing framework gives errors unrelated to test
 The rails testing framework keeps giving me errors unrelated to my test files or my test_helper file, and I'm not sure why. It seems like it's running code from other parts of the project, and I'm trying to find out how it gets there. \$ rake test Run options: --seed 42237 # Running: EEE Finished in 0.692285s, 4.3335 runs/s, 0.0000 assertions/s. ... 3) Error: UserTest#test_the_truth: ActiveRecord::StatementInvalid: Mysql2::Error: Field 'created_at' doesn't have a default value: INSERT INTO balancesheets (Company_ID, Balancesheet_date) VALUES (1, '2015-05-12')  I tried to write tests for my User model, but even if change the test to just "assert true", it still gets the strange output. Here is my test/models/user_test.rb require 'test_helper' class UserTest < ActiveSupport::TestCase test "the truth" do assert true end end  And here is my test/test_helper.rb ENV['RAILS_ENV'] ||= 'test' require File.expand_path('../../config/environment', __FILE__) require 'rails/test_help' class ActiveSupport::TestCase # Setup all fixtures in test/fixtures/*.yml for all tests in alphabetical order. fixtures :all # Add more helper methods to be used by all tests here... end  I'm new to rails, and so both files are still basically their defaults when you start a new project. Why do I see test output relating to a mysql INSERT? If you could point me in the right direction, that would be great. Also, let me know if I need to add more context. Thanks! EDIT: Here is the file in db/migrate/ where I create balancesheets class CreateBalancesheets < ActiveRecord::Migration def change create_table :balancesheets do |t| t.integer :Company_ID t.date :Balancesheet_date t.timestamps null: false end end end