More unit tests.

test.py

@@ -1,9 +1,14 @@
 # test_with_pytest.py
 
-# import pytest
+import pytest
 
-from calculator import add
+from calculator import *
 
 def test_add():
     assert add(2, 2) == 4
 
+def test_multiply():
+    assert multiply(6, 8) == 48
+
+def test_divide():
+    assert divide(60, 5) == 12