diff --git a/data_analysis/tests/data/test_donau_measurements.csv b/data_analysis/tests/data/test_donau_measurements.csv
new file mode 100644
index 0000000..0081588
--- /dev/null
+++ b/data_analysis/tests/data/test_donau_measurements.csv
@@ -0,0 +1,8 @@
+timestamp,voltage_mv,temperature_c,humidity_percent
+2024-05-01T21:00:00,123.4,12.5,68.2
+2024-05-01T21:10:00,130.2,12.7,67.8
+2024-05-01T21:20:00,118.9,12.4,69.1
+2024-05-01T21:30:00,125.6,12.6,68.5
+2024-05-01T21:40:00,132.1,12.8,67.9
+2024-05-01T21:50:00,119.8,12.3,69.3
+2024-05-01T22:00:00,128.5,12.7,68.0
\ No newline at end of file