diff --git a/data_visualization/tests/data/test_frequency_data.csv b/data_visualization/tests/data/test_frequency_data.csv
new file mode 100644
index 0000000..e80e4d2
--- /dev/null
+++ b/data_visualization/tests/data/test_frequency_data.csv
@@ -0,0 +1,11 @@
+frequency_hz,amplitude_db
+20.0,-60.0
+50.0,-50.0
+100.0,-45.0
+200.0,-40.0
+500.0,-30.0
+1000.0,-25.0
+2000.0,-20.0
+5000.0,-15.0
+10000.0,-12.0
+16000.0,-18.0