diff --git a/tests/tbf/TbfTest.cpp b/tests/tbf/TbfTest.cpp
index decf4d9..911092a 100644
--- a/tests/tbf/TbfTest.cpp
+++ b/tests/tbf/TbfTest.cpp
@@ -78,6 +78,31 @@
 	OSMO_ASSERT(the_bts.timing_advance()->recall(0x4232) == 4);
 }
 
+static const struct log_info_cat default_categories[] = {
+        {"DCSN1", "\033[1;31m", "Concrete Syntax Notation One (CSN1)", LOGL_INFO, 0},
+        {"DL1IF", "\033[1;32m", "GPRS PCU L1 interface (L1IF)", LOGL_DEBUG, 1},
+        {"DRLCMAC", "\033[0;33m", "GPRS RLC/MAC layer (RLCMAC)", LOGL_DEBUG, 1},
+        {"DRLCMACDATA", "\033[0;33m", "GPRS RLC/MAC layer Data (RLCMAC)", LOGL_DEBUG, 1},
+        {"DRLCMACDL", "\033[1;33m", "GPRS RLC/MAC layer Downlink (RLCMAC)", LOGL_DEBUG, 1},
+        {"DRLCMACUL", "\033[1;36m", "GPRS RLC/MAC layer Uplink (RLCMAC)", LOGL_DEBUG, 1},
+        {"DRLCMACSCHED", "\033[0;36m", "GPRS RLC/MAC layer Scheduling (RLCMAC)", LOGL_DEBUG, 1},
+        {"DRLCMACMEAS", "\033[1;31m", "GPRS RLC/MAC layer Measurements (RLCMAC)", LOGL_INFO, 1},
+        {"DBSSGP","\033[1;34m", "GPRS BSS Gateway Protocol (BSSGP)", LOGL_INFO , 1},
+        {"DPCU", "\033[1;35m", "GPRS Packet Control Unit (PCU)", LOGL_NOTICE, 1},
+};
+
+static int filter_fn(const struct log_context *ctx,
+                     struct log_target *tar)
+{
+        return 1;
+}
+
+const struct log_info debug_log_info = {
+	filter_fn,
+	(struct log_info_cat*)default_categories,
+	ARRAY_SIZE(default_categories),
+};
+
 int main(int argc, char **argv)
 {
 	tall_pcu_ctx = talloc_named_const(NULL, 1, "moiji-mobile TbfTest context");
@@ -85,7 +110,7 @@
 		abort();
 
 	msgb_set_talloc_ctx(tall_pcu_ctx);
-	osmo_init_logging(&gprs_log_info);
+	osmo_init_logging(&debug_log_info);
 	log_set_use_color(osmo_stderr_target, 0);
 	log_set_print_filename(osmo_stderr_target, 0);
 
diff --git a/tests/tbf/TbfTest.err b/tests/tbf/TbfTest.err
index 9e2f183..3e52da4 100644
--- a/tests/tbf/TbfTest.err
+++ b/tests/tbf/TbfTest.err
@@ -1,3 +1,17 @@
+********** TBF starts here **********
+Allocating DL TBF: TFI=0 TRX=0 MS_CLASS=0
+Slot Allocation (Algorithm A) for class 0
+- Skipping TS 0, because not enabled
+- Skipping TS 1, because not enabled
+- Assign downlink TS=2
+- Setting Control TS 2
 TBF(TFI=0 TLLI=0x00000000 DIR=DL) changing tlli from TLLI=0x00000000 TLLI=0x00002342 ul_changed=0
+********** TBF starts here **********
+Allocating UL TBF: TFI=0 TRX=0 MS_CLASS=0
+Slot Allocation (Algorithm A) for class 0
+- Skipping TS 0, because not enabled
+- Skipping TS 1, because not enabled
+- Assign uplink TS=2 USF=0
+- Setting Control TS 2
 TBF(TFI=0 TLLI=0x00000000 DIR=UL) changing tlli from TLLI=0x00000000 TLLI=0x00002342 ul_changed=0
 TBF(TFI=0 TLLI=0x00002342 DIR=DL) changing tlli from TLLI=0x00002342 TLLI=0x00004232 ul_changed=1