Adding chapter 5 source code

Chapter5/mypytest/tests/test_mycalc2.py

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+# test_mycalc2.py test calc functions using test fixture
+
+import pytest
+from mypytest.src.myadd3 import add
+from mypytest.src.mycalc import MyCalc
+
+@pytest.fixture(scope="module")
+def my_calc():
+    my_calc = MyCalc()
+    yield my_calc
+    del my_calc
+
+@pytest.fixture
+def data_set(request):
+    dict = {'x':10, 'y':5}
+    def delete_dict():
+        del dict
+    request.addfinalizer(delete_dict)
+    return dict
+
+def test_add(my_calc, data_set):
+    """ test case to validate two positive numbers"""
+    assert my_calc.add(data_set.get('x'), data_set.get('y')) == 15
+
+def test_subtract(my_calc, data_set):
+    """ test case to validate two positive numbers"""
+    assert my_calc.subtract(data_set.get('x'), data_set.get('y')) == 5
+