diff --git a/tests/csv/ts1.csv b/tests/csv/ts1.csv
new file mode 100644
index 000000000..e00974877
--- /dev/null
+++ b/tests/csv/ts1.csv
@@ -0,0 +1,11 @@
+,A1,A2
+1Y,               1,               2
+2Y,               2,               4
+3Y,               3,               6
+4Y,               4,               8
+5Y,               5,              10
+6Y,               6,              12
+7Y,               7,              14
+8Y,               8,              16
+9Y,               9,              18
+10Y,              10,              20
diff --git a/tests/csv/ts2.csv b/tests/csv/ts2.csv
new file mode 100644
index 000000000..348891b14
--- /dev/null
+++ b/tests/csv/ts2.csv
@@ -0,0 +1,10 @@
+1Y,               1,               2
+1Y,               2,               4
+2Y,               3,               6
+3Y,               4,               8
+4Y,               5,              10
+5Y,               6,              12
+6Y,               7,              14
+7Y,               8,              16
+8Y,               9,              18
+9Y,              10,              20
diff --git a/tests/csv/ts3.csv b/tests/csv/ts3.csv
new file mode 100644
index 000000000..c8ebc713a
--- /dev/null
+++ b/tests/csv/ts3.csv
@@ -0,0 +1,10 @@
+1,               2
+2,               4
+3,               6
+4,               8
+5,              10
+6,              12
+7,              14
+8,              16
+9,              18
+10,              20
diff --git a/tests/csv/ts4.csv b/tests/csv/ts4.csv
new file mode 100644
index 000000000..073a770b8
--- /dev/null
+++ b/tests/csv/ts4.csv
@@ -0,0 +1,11 @@
+A, B
+1,               2
+2,               4
+3,               6
+4,               8
+5,              10
+6,              12
+7,              14
+8,              16
+9,              18
+10,              20