Seedtag: sets bid request's currency to USD (#4296)

Author: sangarbe

src/main/java/org/prebid/server/bidder/seedtag/SeedtagBidder.java

@@ -72,6 +72,7 @@ public Result<List<HttpRequest<BidRequest>>> makeHttpRequests(BidRequest request
 
         final BidRequest modifiedBidRequest = request.toBuilder()
                 .imp(modifiedImps)
+                .cur(Collections.singletonList(BIDDER_CURRENCY))
                 .build();
         return Result.of(
                 Collections.singletonList(BidderUtil.defaultRequest(modifiedBidRequest, endpointUrl, mapper)),

src/test/java/org/prebid/server/bidder/seedtag/SeedtagBidderTest.java

@@ -75,10 +75,9 @@ public void makeHttpRequestsShouldMakeOneRequestWithAllImps() {
 
         // then
         assertThat(result.getErrors()).isEmpty();
-        assertThat(result.getValue()).hasSize(1)
-                .extracting(HttpRequest::getPayload)
-                .flatExtracting(BidRequest::getImp)
-                .hasSize(2);
+        final BidRequest outgoingRequest = result.getValue().get(0).getPayload();
+        assertThat(outgoingRequest.getImp()).hasSize(2);
+        assertThat(outgoingRequest.getCur()).containsExactly("USD");
     }
 
     @Test