diff --git a/data_analysis/tests/data/sample_data.csv b/data_analysis/tests/data/sample_data.csv
new file mode 100644
index 0000000..dcdd359
--- /dev/null
+++ b/data_analysis/tests/data/sample_data.csv
@@ -0,0 +1,11 @@
+time,surface_type,average_diameter,minutes_since_start
+2024-05-01T00:00:00,Aluminium,0.32,0
+2024-05-01T00:10:00,Edelstahl,0.28,10
+2024-05-01T00:20:00,Kupfer,0.35,20
+2024-05-01T00:30:00,Aluminium,0.40,30
+2024-05-01T00:40:00,Edelstahl,0.37,40
+2024-05-01T00:50:00,Kupfer,0.42,50
+2024-05-01T01:00:00,Aluminium,0.44,60
+2024-05-01T01:10:00,Edelstahl,0.41,70
+2024-05-01T01:20:00,Kupfer,0.47,80
+2024-05-01T01:30:00,Aluminium,0.49,90
\ No newline at end of file