--- a
+++ b/tests/test_sampen.py
@@ -0,0 +1,35 @@
+import numpy
+import os
+import unittest
+
+from pyeeg import samp_entropy
+
+
+class SampEnTests(unittest.TestCase):
+    def test_sampen_against_predictable_sequence(self):
+        data = numpy.asarray([10, 20] * 2000)
+        self.assertAlmostEqual(
+            samp_entropy(data, 2, 0.2),
+            0.0,
+            places=2
+        )
+
+    def test_sampen_against_original_c_test_data(self):
+        """Use test data from
+        http://www.physionet.org/physiotools/sampen/c/sampentest.txt
+        """
+        dir = os.path.dirname(__file__)
+        file_path = os.path.join(dir, './demo_data/sampentest.txt')
+        data = []
+        with open(file_path, 'r') as file:
+            for row in file:
+                data.append(float(row.strip()))
+
+        self.assertEqual(
+            samp_entropy(numpy.asarray(data), 2, 0.2),
+            2.1233284920357112
+        )
+
+
+if __name__ == '__main__':
+    unittest.main()