diff --git a/tests/bench_str.csv b/tests/bench_str.csv
new file mode 100644
index 0000000..d177b64
--- /dev/null
+++ b/tests/bench_str.csv
@@ -0,0 +1,5 @@
+1400242718,5649455.80
+1400242784,5775186.12
+1400242814,5653481.02
+1400242868,5857187.70
+1400242938,5732228.92