It is PRINCIPLES - truths; not PRINCIPALS - people in charge of schools or racing teams.

By deleteing the dev database, recreating it from migrations and then preparing the test database; the foreign key contraints now work. Also the database tables are now uft8mb4 instead of lantin1.

May be an idea to do this every time there is a rails update until going live.

test/models/company_test.rb

@@ -1,7 +1,7 @@
 require "test_helper"
 
 class CompanyTest < ActiveSupport::TestCase
-  test "compnay name can not be blank" do
+  test "company name can not be blank" do
      c = Company.new
      assert !c.save
    end