@@ -1,5 +1,7 @@
 # fileparse.py
 import csv
+import logging
+log = logging.getLogger(__name__)
 
 
 def parse_csv(lines, select=None, types=None, has_headers=True, delimiter=',', silence_errors=False):
@@ -34,8 +36,8 @@ def parse_csv(lines, select=None, types=None, has_headers=True, delimiter=',', s
                 row = [func(val) for func, val in zip(types, row)]
             except ValueError as e:
                 if not silence_errors:
-                    print(f"Row {rowno}: Couldn't convert {row}")
-                    print(f"Row {rowno}: Reason {e}")
+                    log.warning(f"Row {rowno}: Couldn't convert {row}")
+                    log.debug(f"Row {rowno}: Reason {e}")
                 continue
 
         # Make a dictionary or a tuple
 
@@ -67,4 +67,10 @@ def main(args):
 
 if __name__ == '__main__':
     import sys
+    import logging
+    logging.basicConfig(
+        filename='app.log',
+        filemode='w',
+        level=logging.DEBUG
+    )
     main(sys.argv)
@@ -0,0 +1,28 @@
+import unittest
+import stock
+
+
+class TestStock(unittest.TestCase):
+    def test_create(self):
+        s = stock.Stock('GOOG', 100, 490.1)
+        self.assertEqual(s.name, 'GOOG')
+        self.assertEqual(s.shares, 100)
+        self.assertEqual(s.price, 490.1)
+
+    def test_cost_propoerty(self):
+        s = stock.Stock('GOOG', 100, 490.1)
+        self.assertEqual(s.cost, 49010)
+
+    def test_sell(self):
+        s = stock.Stock('GOOG', 100, 490.1)
+        s.sell(50)
+        self.assertEqual(s.shares, 50)
+
+    def test_sharestype(self):
+        s = stock.Stock('GOOG', 100, 490.1)
+        with self.assertRaises(TypeError):
+            s.shares = '100'
+
+
+if __name__ == '__main__':
+    unittest.main()