Adding chapter 5 source code

Chapter5/mypytest/tests/test_mycalc1.py

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+# test_mycalc1.py test calc functions using test fixture
+import sys
+
+import pytest
+from mypytest.src.myadd3 import add
+from mypytest.src.mycalc import MyCalc
+
+@pytest.fixture(scope="module")
+def my_calc():
+    return MyCalc()
+
+@pytest.fixture
+def test_data():
+    return {'x':10, 'y':5}
+
+def test_add(my_calc, test_data):
+    """ test case to validate two positive numbers"""
+    assert my_calc.add(test_data.get('x'), test_data.get('y')) == 15
+
+def test_subtract(my_calc, test_data):
+    """ test case to validate two positive numbers"""
+    assert my_calc.subtract(test_data.get('x'), test_data.get('y')) == 5
+