fix: SCHWED-5481 add missing file

modules/io/tests/test_io_sdf.py

+import unittest
+from ost import *
+import subprocess
+
+class TestSDF(unittest.TestCase):
+  def setUp(self):
+    pass
+
+  def test_LoadEntity(self):
+    ent = io.LoadSDF('testfiles/sdf/compound.sdf')
+    self.assertEqual(len(ent.chains), 4)
+    self.assertEqual(len(ent.atoms), 180)
+    self.assertEqual(len(ent.bonds), 188)
+
+  def test_LoadEntity_crlf(self):
+    ent = io.LoadSDF('testfiles/sdf/6d5w_rank1_crlf.sdf.gz')
+    self.assertEqual(len(ent.atoms), 21)
+    self.assertEqual(len(ent.bonds), 24)
+    
+if __name__== '__main__':
+  from ost import testutils
+  testutils.RunTests()
+
+
+