test: add missing location validations for nil postcode & mobility type

spec/models/location_spec.rb

@@ -34,6 +34,12 @@ RSpec.describe Location, type: :model do
       expect { location.save! }
         .to raise_error(ActiveRecord::RecordInvalid, "Validation failed: Postcode #{I18n.t('validations.postcode')}")
     end
+
+    it "does add an error when the postcode is missing" do
+      location.postcode = nil
+      expect { location.save! }
+        .to raise_error(ActiveRecord::RecordInvalid, "Validation failed: Postcode #{I18n.t('validations.postcode')}")
+    end
   end
 
   describe "#units" do
@@ -56,6 +62,16 @@ RSpec.describe Location, type: :model do
     end
   end
 
+  describe "#mobility_type" do
+    let(:location) { FactoryBot.build(:location) }
+
+    it "does add an error when the mobility type is invalid" do
+      location.mobility_type = nil
+      expect { location.save! }
+        .to raise_error(ActiveRecord::RecordInvalid, "Validation failed: Mobility type #{I18n.t('activerecord.errors.models.location.attributes.mobility_type.blank')}")
+    end
+  end
+
   describe "paper trail" do
     let(:location) { FactoryBot.create(:location) }
     let!(:name) { location.name }