Add test case for currency.

adapters/gumgum/gumgum_test.go

@@ -1,11 +1,15 @@
 package gumgum
 
 import (
+	"encoding/json"
 	"testing"
 
+	"github.com/prebid/openrtb/v20/openrtb2"
+	"github.com/prebid/prebid-server/v2/adapters"
 	"github.com/prebid/prebid-server/v2/adapters/adapterstest"
 	"github.com/prebid/prebid-server/v2/config"
 	"github.com/prebid/prebid-server/v2/openrtb_ext"
+	"github.com/stretchr/testify/assert"
 )
 
 func TestJsonSamples(t *testing.T) {
@@ -18,3 +22,59 @@ func TestJsonSamples(t *testing.T) {
 
 	adapterstest.RunJSONBidderTest(t, "gumgumtest", bidder)
 }
+
+func TestResponseWithCurrencies(t *testing.T) {
+	// Test for USD currency
+	assertCurrencyInBidResponse(t, "USD", "USD")
+
+	// Test for EUR currency
+	assertCurrencyInBidResponse(t, "EUR", "EUR")
+}
+
+func assertCurrencyInBidResponse(t *testing.T, expectedCurrency string, currency string) {
+	// Create a GumGum bidder
+	bidder, buildErr := Builder(openrtb_ext.BidderGumGum, config.Adapter{
+		Endpoint: "https://g2.gumgum.com/providers/prbds2s/bid"}, config.Server{
+		ExternalUrl: "http://hosturl.com",
+		GvlID:       1,
+		DataCenter:  "2",
+	})
+
+	if buildErr != nil {
+		t.Fatalf("Builder returned unexpected error %v", buildErr)
+	}
+
+	// Create a mock BidRequest
+	prebidRequest := &openrtb2.BidRequest{
+		Imp: []openrtb2.Imp{},
+	}
+
+	// Create a mock BidResponse with or without currency
+	mockedBidResponse := &openrtb2.BidResponse{}
+	if currency != "" {
+		mockedBidResponse.Cur = currency
+	}
+
+	// Marshal the mock bid response to JSON
+	body, err := json.Marshal(mockedBidResponse)
+	if err != nil {
+		t.Fatalf("Failed to marshal mock bid response: %v", err)
+	}
+
+	// Create a mock ResponseData
+	responseData := &adapters.ResponseData{
+		StatusCode: 200,
+		Body:       body,
+	}
+
+	// Call MakeBids
+	bidResponse, errs := bidder.MakeBids(prebidRequest, nil, responseData)
+
+	// Assert no errors
+	if len(errs) != 0 {
+		t.Fatalf("Failed to make bids %v", errs)
+	}
+
+	// Assert that the currency is correctly set
+	assert.Equal(t, expectedCurrency, bidResponse.Currency, "Expected currency to be set to "+expectedCurrency)
+}