fixing tests p1

db/migrate/20170112151637_create_lti_parameters.rb

@@ -0,0 +1,11 @@
+class CreateLtiParameters < ActiveRecord::Migration
+  def change
+    create_table :lti_parameters do |t|
+      t.belongs_to :external_users
+      t.belongs_to :consumers
+      t.belongs_to :exercises
+      t.jsonb :lti_parameters, null: false, default: '{}'
+      t.timestamps
+    end
+  end
+end