Add test for comma separated query param indices

Author: bitwiseguy

api/service/api_test.go

@@ -180,6 +180,14 @@ func TestAPIService(t *testing.T) {
 				Data: blockTwo.BlobSidecars.Data,
 			},
 		},
+		{
+			name:   "multi indices comma separated list",
+			path:   "/eth/v1/beacon/blob_sidecars/1234?indices=0,1",
+			status: 200,
+			expected: &storage.BlobSidecars{
+				Data: blockTwo.BlobSidecars.Data,
+			},
+		},
 		{
 			name:       "only index out of bounds returns empty array",
 			path:       "/eth/v1/beacon/blob_sidecars/1234?indices=3",