update tests

src/test/java/org/prebid/server/bidder/silvermob/SilvermobBidderTest.java

@@ -272,6 +272,27 @@ public void makeBidsShouldReturnNativeBidIfMTypeIsNative() throws JsonProcessing
                 .containsOnly(BidderBid.of(Bid.builder().impid("123").mtype(4).build(), xNative, "USD"));
     }
 
+    @Test
+    public void makeBidsShouldThrowErrorWhenMediaTypeIsMissing() throws JsonProcessingException {
+        // given
+        final BidderCall<BidRequest> httpCall = givenHttpCall(BidRequest.builder()
+                        .imp(singletonList(Imp.builder().id("123").build()))
+                        .build(),
+                mapper.writeValueAsString(
+                        givenBidResponse(bidBuilder -> bidBuilder.impid("123"))));
+
+        // when
+        final Result<List<BidderBid>> result = target.makeBids(httpCall, null);
+
+        // then
+        assertThat(result.getValue()).isEmpty();
+        assertThat(result.getErrors()).hasSize(1)
+                .allSatisfy(error -> {
+                    assertThat(error.getMessage()).startsWith("Missing MType for bid: null");
+                    assertThat(error.getType()).isEqualTo(BidderError.Type.bad_server_response);
+                });
+    }
+
     private static BidRequest givenBidRequest(
             UnaryOperator<BidRequest.BidRequestBuilder> bidRequestCustomizer,
             UnaryOperator<Imp.ImpBuilder> impCustomizer) {

src/test/resources/org/prebid/server/it/openrtb2/silvermob/test-auction-silvermob-request.json

@@ -11,7 +11,8 @@
         "silvermob": {
           "zoneid": "testZoneId",
           "host": "eu"
-        }
+        },
+        "mtype": 1
       },
       "tagid": "tag_id"
     }

src/test/resources/org/prebid/server/it/openrtb2/silvermob/test-auction-silvermob-response.json

@@ -15,8 +15,10 @@
             "prebid": {
               "type": "banner"
             },
-            "origbidcpm": 0.01
-          }
+            "origbidcpm": 0.01,
+            "origbidcur": "USD"
+          },
+          "mtype": 1
         }
       ],
       "seat": "silvermob",

src/test/resources/org/prebid/server/it/openrtb2/silvermob/test-silvermob-bid-request.json

@@ -14,7 +14,8 @@
         "bidder": {
           "zoneid": "testZoneId",
           "host": "eu"
-        }
+        },
+        "mtype": 1
       }
     }
   ],

src/test/resources/org/prebid/server/it/openrtb2/silvermob/test-silvermob-bid-response.json

@@ -9,10 +9,12 @@
           "price": 0.01,
           "id": "bid_id",
           "impid": "imp_id",
-          "cid": "cid"
+          "cid": "cid",
+          "mtype": 1
         }
       ],
-      "type": "banner"
+      "seat": "silvermob"
     }
-  ]
+  ],
+  "cur": "USD"
 }