diff --git a/results_analysis/tests/data/sample_previous_results.csv b/results_analysis/tests/data/sample_previous_results.csv
new file mode 100644
index 0000000..5ce6a67
--- /dev/null
+++ b/results_analysis/tests/data/sample_previous_results.csv
@@ -0,0 +1,6 @@
+run_id,decision,unknown_rate,warn_rate
+run_001,PASS,0.01,0.02
+run_002,FAIL,0.0,0.10
+run_003,WARN,0.05,0.15
+run_004,PASS,0.0,0.0
+run_005,FAIL,0.02,0.05