Added solution code

Solutions/8_1/test_stock.py

@@ -0,0 +1,28 @@
+# test_stock.py
+
+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(self):
+        s = stock.Stock('GOOG', 100, 490.1)
+        self.assertEqual(s.cost, 49010.0)
+
+    def test_sell(self):
+        s = stock.Stock('GOOG', 100, 490.1)
+        s.sell(25)
+        self.assertEqual(s.shares, 75)
+
+    def test_shares_check(self):
+        s = stock.Stock('GOOG', 100, 490.1)
+        with self.assertRaises(TypeError):
+            s.shares = '100'
+
+if __name__ == '__main__':
+    unittest.main()