Python Unit Test Automation

Listing 4-1.  test_module01.py
def test_case01():
        assert 'aaa'.upper() == 'AAA'
Figure 4-1.  The chapter04 directory structure

---

Chapter 4 
■
 nose and nose2
67
In Listing 
4-1
, test_case01() is the test function. assert is Python’s built-in 
keyword and it works like the assert methods in unittest. If you compare this code with 
the simplest test case in the unittest framework, you will notice that you do not have to 
extend the test from any parent class. This makes the test code cleaner and less cluttered.
If you try to run it with the following commands, it will not yield any output:
python3 test_module01.py
python3 test_module01.py -v
This is because you have not included a test-runner in the code.
You can run it by using the -m command-line option for Python as follows:
python3 -m nose test_module01.py
The output is as follows:
.
----------------------------------------------------------------------
Ran 1 test in 0.007s
OK
Verbose mode can be invoked by adding the -v command-line option as follows:
python3 -m nose -v test_module01.py
The output is as follows:
test.test_module01.test_case01 ... ok
----------------------------------------------------------------------
Ran 1 test in 0.007s
OK
Running the Test Module with nosetests
You can use nose’s nosetests command to run the test modules as follows:
nosetests test_module01.py
The output is as follows:
.
----------------------------------------------------------------------
Ran 1 test in 0.006s
OK

---

Chapter 4 
■
 nose and nose2
68
Verbose mode can be invoked as follows:
nosetests test_module01.py -v
The output is as follows:
test.test_module01.test_case01 ... ok
----------------------------------------------------------------------
Ran 1 test in 0.007s
OK
Using the nosetests command is the simplest way to run the test modules. Due to 
the simplicity and convenience of the coding and invocation style, we will use nosetests 
to run the tests until we introduce and explain nose2.
Getting Help
Use the following command to get help and documentation about nose:
nosetests -h
Organizing the test code
In the previous chapter, you learned how to organize the development and the testing 
code of the project in separate directories. You will follow the same standard in this 
and the next chapter too. First create a test module to test the development code in 
mypackage. Save the code shown in Listing 
4-2
 in the test directory.