add chapter3

Author: alfredodeza

Diff for: chapter3/bare_asserts.py

@@ -0,0 +1,7 @@
+
+def assert_flow_control(value):
+    """
+    An example on flow control with bare asserts
+    """
+    assert value
+    return "got a value of expected type!"

Diff for: chapter3/simplest.py

@@ -0,0 +1,13 @@
+from unittest import TestCase
+
+
+def test_simplest():
+    assert True
+
+class TestSimple(TestCase):
+
+    def test_simple(self):
+        self.assertTrue(True)
+
+
+

Diff for: chapter3/test_asserts.py

@@ -0,0 +1,23 @@
+
+def test_long_strings():
+    string = ("This is a very, very, long string that has some differences"
+            "that are hard to catch")
+    expected = ("This is a very, very long string that hes some differences"
+            "that are hard to catch")
+    assert string == expected
+
+
+def test_nested_dictionaries():
+    result = {'first': 12, 'second': 13,
+            'others': {'success': True, 'msg': 'A success message!'}}
+    expected = {'first': 12, 'second': 13,
+            'others': {'success': True, 'msg': 'A sucess message!'}}
+    assert result == expected
+
+def test_missing_key():
+    result = {'first': 12, 'second': 13,
+            'others': {'success': True, 'msg': 'A success message!'}}
+    expected = {'first': 12, 'second': 13,
+            'others': {'msg': 'A success message!'}}
+    assert result == expected
+

Diff for: chapter3/test_is_empty.py

@@ -0,0 +1,18 @@
+def is_empty(value):
+    return len(value) == 0
+
+
+def test_empty_list():
+    assert is_empty([]) is True
+
+def test_empty_dict():
+    assert is_empty({}) is True
+
+def test_list_is_not_empty():
+    assert is_empty([1,2,3]) is False
+
+def test_dict_is_not_empty():
+    assert is_empty({"item": 1}) is False
+
+def test_it_breaks():
+    assert is_empty(1) is False

Diff for: chapter3/test_is_empty_robust.py

@@ -0,0 +1,20 @@
+def is_empty(value):
+    try:
+        return len(value) == 0
+    except TypeError:
+        return False
+
+def test_empty_list():
+    assert is_empty([]) is True
+
+def test_empty_dict():
+    assert is_empty({}) is True
+
+def test_list_is_not_empty():
+    assert is_empty([1,2,3]) is False
+
+def test_dict_is_not_empty():
+    assert is_empty({"item": 1}) is False
+
+def test_integer_is_false():
+    assert is_empty(1) is False