FilesExpand file tree

 master

/

test_parameter_injection.py

Copy path

Blame

More file actions

Blame

More file actions

Latest commit

 

History

History

History

45 lines (37 loc) · 1.91 KB

 master

/

test_parameter_injection.py

Copy path

Top

File metadata and controls

• Code
• Blame

45 lines (37 loc) · 1.91 KB

Raw

Copy raw file

Download raw file

Open symbols panel

Edit and raw actions

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

#!/usr/bin/env python

# -*- coding: utf-8 -*-

import unittest

from dft.parameter_injection import TimeDisplay, MidnightTimeProvider, ProductionCodeTimeProvider, datetime

"""

Port of the Java example of "Parameter Injection" in

"xUnit Test Patterns - Refactoring Test Code" by Gerard Meszaros

(ISBN-10: 0131495054, ISBN-13: 978-0131495050) accessible in outdated version on

http://xunitpatterns.com/Dependency%20Injection.html.

Test code which will almost always fail (if not exactly 12:01) when untestable

production code (have a look into constructor_injection.py) is used:

def test_display_current_time_at_midnight(self):

class_under_test = TimeDisplay()

expected_time = "24:01"

result = class_under_test.get_current_time_as_as_html_fragment()

self.assertEqual(result, expected_time)

"""

class ParameterInjectionTest(unittest.TestCase):

def test_display_current_time_at_midnight(self):

"""

Would almost always fail (despite of right at/after midnight) if

untestable production code would have been used.

"""

time_provider_stub = MidnightTimeProvider()

class_under_test = TimeDisplay()

expected_time = "<span class=\"tinyBoldText\">24:01</span>"

self.assertEqual(class_under_test.get_current_time_as_html_fragment(time_provider_stub), expected_time)

def test_display_current_time_at_current_time(self):

"""

Just as justification for working example with the time provider used in

production. (Will always pass.)

"""

production_code_time_provider = ProductionCodeTimeProvider()

class_under_test = TimeDisplay()

current_time = datetime.datetime.now()

expected_time = "<span class=\"tinyBoldText\">{}:{}</span>".format(current_time.hour, current_time.minute)

self.assertEqual(class_under_test.get_current_time_as_html_fragment(production_code_time_provider), expected_time)