Add more GetBidding test and IsError

offer_test.go

@@ -1,6 +1,8 @@
 package ebay_test
 
 import (
+	"context"
+	"fmt"
 	"net/http"
 	"testing"
 
@@ -13,3 +15,17 @@ func TestOptBuyMarketplace(t *testing.T) {
 	ebay.OptBuyMarketplace("EBAY_US")(r)
 	assert.Equal(t, "EBAY_US", r.Header.Get("X-EBAY-C-MARKETPLACE-ID"))
 }
+
+func TestGetBidding(t *testing.T) {
+	client, mux, teardown := setup(t)
+	defer teardown()
+
+	mux.HandleFunc("/buy/offer/v1_beta/bidding/v1|202117468662|0", func(w http.ResponseWriter, r *http.Request) {
+		marketplaceID := r.Header.Get("X-EBAY-C-MARKETPLACE-ID")
+		fmt.Fprintf(w, `{"itemId": "%s"}`, marketplaceID)
+	})
+
+	bidding, err := client.Buy.Offer.GetBidding(context.Background(), "v1|202117468662|0", ebay.BuyMarketplaceUSA)
+	assert.Nil(t, err)
+	assert.Equal(t, ebay.BuyMarketplaceUSA, bidding.ItemID)
+}