diff --git a/python/tests/sql/test_function.py b/python/tests/sql/test_function.py
index 948972c428..fdf64629fa 100644
--- a/python/tests/sql/test_function.py
+++ b/python/tests/sql/test_function.py
@@ -96,6 +96,9 @@ def test_st_buffer(self):
         function_df = self.spark.sql("select ST_Buffer(polygondf.countyshape, 1) from polygondf")
         function_df.show()
 
+        function_df = self.spark.sql("select ST_Buffer(polygondf.countyshape, 10, 'endcap=square') from polygondf")
+        function_df.show()
+
     def test_st_envelope(self):
         polygon_from_wkt = self.spark.read.format("csv"). \
             option("delimiter", "\t"). \