#new without any parameters

spec/active_record/has_aux_table_spec.rb

@@ -51,6 +51,16 @@ RSpec.describe HasAuxTable do
     end
   end
 
+  it "can be created with .new" do
+    car = Car.new
+    car.name = "Honda Civic"
+    car.engine_size = 1.8
+    car.save!
+    expect(car.fuel_type).to be_nil
+    expect(car.engine_size).to eq(1.8)
+    expect(car.name).to eq("Honda Civic")
+  end
+
   it "has the right #attributes" do
     car =
       Car.create!(name: "Honda Civic", fuel_type: "gasoline", engine_size: 2.0)