diff --git a/bob/db/morph/test.py b/bob/db/morph/test.py
index 9857a2c39a87bcb218939d9dd69b16a7c653e6cb..827bea6d9732ac6d25242710a14ffd6c2c77e104 100644
--- a/bob/db/morph/test.py
+++ b/bob/db/morph/test.py
@@ -208,7 +208,7 @@ def test_verification_fold1_probes_dev():
         expected_sample_count=1,
         match_sample_count_exactly=False,
         is_probes=True,
-        ref_count=None,
+        ref_count=10540//2,
     )
 
 # -----------------------------------------------------------------------------
@@ -240,7 +240,7 @@ def test_verification_fold1_probes_eval():
         expected_sample_count=1,
         match_sample_count_exactly=False,
         is_probes=True,
-        ref_count=None,
+        ref_count=10540//2,
     )
 
 
@@ -303,9 +303,15 @@ def test_debug_protocol_probes_dev():
         expected_sample_count=1,
         match_sample_count_exactly=False,
         is_probes=True,
-        ref_count=None,
+        ref_count=100,
     )
 
+    ids = [p.subject for p in probes_set_dev]
+    
+    assert len(set(ids)) == 100
+    assert len(set(probes_set_dev[0].references)) == 100
+    assert len(_commons(set(ids), set(probes_set_dev[0].references))) == 100
+
 # -----------------------------------------------------------------------------
 # references eval
 # -----------------------------------------------------------------------------
@@ -335,5 +341,11 @@ def test_debug_protocol_probes_eval():
         expected_sample_count=1,
         match_sample_count_exactly=False,
         is_probes=True,
-        ref_count=None,
+        ref_count=100,
     )
+
+    ids = [p.subject for p in probes_set_eval]
+
+    assert len(set(ids)) == 100
+    assert len(set(probes_set_eval[0].references)) == 100
+    assert len(_commons(set(ids), set(probes_set_eval[0].references))) == 100