Add inspection methods to shipping option

lib/planet_express/shipping_option.rb

@@ -1,5 +1,17 @@
 # frozen_string_literal: true
 
 module PlanetExpress
-  ShippingOption = Struct.new(:provider, :package_size, :price_in_cents)
+  ShippingOption = Struct.new(:provider, :package_size, :price_in_cents) do
+    def s_shipment?
+      package_size == 'S'
+    end
+
+    def l_shipment?
+      package_size == 'L'
+    end
+
+    def inspect
+      "ShippingOption [proivder=#{provider} package_size=#{package_size} price_in_cents=#{price_in_cents}]"
+    end
+  end
 end

spec/shipping_option_spec.rb

@@ -0,0 +1,35 @@
+# frozen_string_literal: true
+
+RSpec.describe PlanetExpress::ShippingOption do
+  describe '#s_shipment?' do
+    context 'with S package size' do
+      subject { build(:shipping_option, package_size: 'S') }
+      it 'returns true' do
+        expect(subject.s_shipment?).to eq(true)
+      end
+    end
+
+    context 'with non S package size' do
+      subject { build(:shipping_option, package_size: 'M') }
+      it 'returns false' do
+        expect(subject.s_shipment?).to eq(false)
+      end
+    end
+  end
+
+  describe '#l_shipment?' do
+    context 'with L package size' do
+      subject { build(:shipping_option, package_size: 'L') }
+      it 'returns true' do
+        expect(subject.l_shipment?).to eq(true)
+      end
+    end
+
+    context 'with non L package size' do
+      subject { build(:shipping_option, package_size: 'M') }
+      it 'returns false' do
+        expect(subject.l_shipment?).to eq(false)
+      end
+    end
+  end
+end