diff --git a/test_brandt.c b/test_brandt.c
index 9d91260..47f3711 100644
--- a/test_brandt.c
+++ b/test_brandt.c
@@ -149,7 +149,7 @@ expected_outcome (uint16_t i, uint16_t *rlen)
 		{
 			if (cur_winner >= winners)
 			{
-				weprintf ("got too many winners");
+				GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "got too many winners\n");
 				_exit (1);
 			}
 			ret[cur_winner].bidder = h;
@@ -168,7 +168,7 @@ bidder_start (void *arg)
 {
 	uint16_t i = *(uint16_t *)arg;
 
-	weprintf ("starting bidder %d", i);
+	GNUNET_log (GNUNET_ERROR_TYPE_INFO, "starting bidder %d\n", i);
 	BRANDT_bidder_start (tcase.ad[i], i, tcase.n);
 }
 
@@ -179,8 +179,8 @@ transfer_message (void *arg)
 	struct msg      *m = (struct msg *)arg;
 	struct msg_head *h = (struct msg_head *)m->buf;
 
-	weprintf ("xfer msg %d %x from %d to %d", ntohl (
-	              h->msg_type), arg, m->sender, m->receiver);
+	GNUNET_log (GNUNET_ERROR_TYPE_INFO, "xfer msg %d %p from %d to %d\n",
+	            ntohl (h->msg_type), arg, m->sender, m->receiver);
 	BRANDT_got_message (tcase.ad[m->receiver], m->sender, m->buf, m->buf_len);
 	GNUNET_free (m->buf);
 	GNUNET_free (m);
@@ -194,7 +194,8 @@ cb_start (void *auction_closure)
 
 	if (tcase.n != *s)
 	{
-		weprintf ("start callback called from bidder");
+		GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+		            "start callback called from bidder\n");
 		_exit (1);
 	}
 
@@ -260,29 +261,40 @@ cb_result (void                 *auction_closure,
 
 	if (mustlen != results_len)
 	{
-		weprintf ("expected result len is: %d", mustlen);
-		weprintf ("computed result len is: %d (by agent %d)", results_len, *s);
+		GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+		            "expected result len is: %d\n",
+		            mustlen);
+		GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+		            "computed result len is: %d (by agent %d)\n",
+		            results_len,
+		            *s);
 		tcase.ret = 1;
 		goto quit;
 	}
 
-	if (0 == results_len)
+	if (0 == results_len && NULL != must)
 	{
-		weprintf ("expected result is: %p", must);
-		weprintf ("computed result is: (nil) (by agent %d)", *s);
+		GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+		            "expected result is: %p\n",
+		            (void *)must);
+		GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+		            "computed result is: (nil) (by agent %d)\n",
+		            *s);
 
-		if (NULL != must)
-			tcase.ret = 1;
+		tcase.ret = 1;
 	}
 
 	for (uint16_t i = 0; i < results_len; i++)
 	{
-		weprintf ("expected result is: bidder %d got status %d with price %d",
-		          must[i].bidder,
-		          must[i].status,
-		          must[i].price);
-		weprintf (
-		    "computed result is: bidder %d got status %d with price %d (by agent %d)",
+		GNUNET_log (
+		    GNUNET_ERROR_TYPE_INFO,
+		    "expected result is: bidder %d got status %d with price %d\n",
+		    must[i].bidder,
+		    must[i].status,
+		    must[i].price);
+		GNUNET_log (
+		    GNUNET_ERROR_TYPE_INFO,
+		    "computed result is: bidder %d got status %d with price %d (by agent %d)\n",
 		    results[i].bidder,
 		    results[i].status,
 		    results[i].price,
@@ -321,7 +333,7 @@ run_auction (void *arg)
 	                                tcase.outcome_public); /* outcome public */
 	if (!tcase.ad[tcase.n])
 	{
-		weprintf ("BRANDT_new() failed.");
+		GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "BRANDT_new() failed.\n");
 		_exit (1);
 	}
 
@@ -336,7 +348,7 @@ run_auction (void *arg)
 		                           tcase.bids[i]); /* bid */
 		if (!tcase.ad[i])
 		{
-			weprintf ("BRANDT_join() failed.");
+			GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "BRANDT_join() failed.\n");
 			tcase.ret = 1;
 			return;
 		}
@@ -351,7 +363,8 @@ run_auction (void *arg)
 		    !tcase.ad[tcase.n]->seller_mode || /* todo: split out */
 		    tcase.ad[i]->seller_mode)
 		{
-			weprintf ("error/mismatch in basic auction data");
+			GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+			            "error/mismatch in basic auction data\n");
 			tcase.ret = 1;
 			return;
 		}
@@ -385,13 +398,16 @@ test_auction (uint16_t n,
 	tcase.outcome_public = outcome_public;
 	tcase.ret = 0;
 
-	weprintf ("######################################");
-	weprintf ("testing %s auction with m = %d and %s outcome",
-	          tcase.m > 0 ? "M+1ST PRICE" : "FIRST PRICE",
-	          tcase.m,
-	          tcase.outcome_public ? "PUBLIC" : "PRIVATE");
-	/** \todo: output bids when migrating to GNUNET_log */
-	weprintf ("######################################");
+	GNUNET_log (GNUNET_ERROR_TYPE_INFO,
+	            "######################################\n");
+	GNUNET_log (GNUNET_ERROR_TYPE_INFO,
+	            "testing %s auction with m = %d and %s outcome\n",
+	            tcase.m > 0 ? "M+1ST PRICE" : "FIRST PRICE",
+	            tcase.m,
+	            tcase.outcome_public ? "PUBLIC" : "PRIVATE");
+	/** \todo: output bids */
+	GNUNET_log (GNUNET_ERROR_TYPE_INFO,
+	            "######################################\n");
 	tcase.ad = GNUNET_new_array (tcase.n + 1, struct BRANDT_Auction *);
 	tcase.id = GNUNET_new_array (tcase.n + 1, uint16_t);
 	for (uint16_t i = 0; i <= tcase.n; i++)
@@ -405,7 +421,9 @@ test_auction (uint16_t n,
 		BRANDT_destroy (tcase.ad[i]);
 		if (!tcase.result_called[i])
 		{
-			weprintf ("result callback not called for bidder %d", i);
+			GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+			            "result callback not called for bidder %d\n",
+			            i);
 			tcase.ret = 1;
 		}
 	}
@@ -424,6 +442,9 @@ main (int argc, char *argv[])
 	int                                 ret = 0;
 	struct GNUNET_CRYPTO_EccDlogContext *edc;
 
+	if (GNUNET_OK != GNUNET_log_setup ("test_brandt", "WARNING", NULL))
+		return 1;
+
 	edc = GNUNET_CRYPTO_ecc_dlog_prepare (1024, 16);
 	BRANDT_init (edc);