diff --git a/mess_log_processing/tests/data/sample_summary.csv b/mess_log_processing/tests/data/sample_summary.csv
new file mode 100644
index 0000000..50ffc19
--- /dev/null
+++ b/mess_log_processing/tests/data/sample_summary.csv
@@ -0,0 +1,11 @@
+t_publish,t_gate_read,t_index_visible,pinned_flag,timeouts,drift_signature
+1.001,1.102,1.205,True,0,drift_a
+1.050,1.160,1.265,False,1,drift_a
+1.110,1.210,1.315,True,0,drift_b
+0.980,1.085,1.190,False,0,drift_c
+1.200,1.310,1.420,True,2,drift_d
+1.150,1.260,1.380,False,0,drift_b
+0.995,1.100,1.205,True,0,drift_a
+1.070,1.180,1.290,False,1,drift_e
+1.250,1.360,1.470,True,0,drift_f
+1.020,1.125,1.235,False,0,drift_c