Model validations

test/models/school_test.rb

@@ -4,4 +4,10 @@ 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.keys
+    end
 end