diff --git a/analysis_tool/tests/data/sample_preflight_log.csv b/analysis_tool/tests/data/sample_preflight_log.csv
new file mode 100644
index 0000000..3b8f574
--- /dev/null
+++ b/analysis_tool/tests/data/sample_preflight_log.csv
@@ -0,0 +1,11 @@
+timestamp,measured_p,freeze_ok,setup_fingerprint,policy_hash
+2024-01-01T10:00:00Z,101.3,True,AUX2_SETUP_A,hash_aux2_a
+2024-01-01T10:05:00Z,100.8,True,AUX2_SETUP_A,hash_aux2_a
+2024-01-01T10:10:00Z,99.9,False,AUX2_SETUP_A,hash_aux2_a
+2024-01-02T09:00:00Z,102.0,True,AUX3_SETUP_B,hash_aux3_b
+2024-01-02T09:05:00Z,101.5,True,AUX3_SETUP_B,hash_aux3_b
+2024-01-02T09:10:00Z,100.2,False,AUX3_SETUP_B,hash_aux3_b
+2024-01-03T08:00:00Z,98.7,True,AUX2_SETUP_C,hash_aux2_c
+2024-01-03T08:05:00Z,97.9,False,AUX2_SETUP_C,hash_aux2_c
+2024-01-03T08:10:00Z,103.1,True,AUX3_SETUP_D,hash_aux3_d
+2024-01-03T08:15:00Z,102.8,True,AUX3_SETUP_D,hash_aux3_d
\ No newline at end of file