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Figure 2 shows that the test failed because the result of the computation did not match the specified value of 6. In this case, the output from thecomputation was correct but the value specified by the test was incorrect.

When testing using the doctest module, you specify what the result must be for the test to pass.If the test fails to produce a matching result, the output will show that the test failed. For the case of Listing 1 and Listing 2 , if the correct result had been specified, the test would simply have returned to the commandprompt with no other output.

A verbose output could have been specified in Listing 2 to cause the test to return positive results even if there were no failures. You will see howto do that in the next example.

A more substantive example

The module named Py1359_1720_02

This example will perform a test on a simple function named sum in a module named Py1359_1720_02.py as shown in Listing 3 .

Listing 3 . Contents of the file named Py1359_1720_02.py.
def sum(parA,parB): return parA + parB

The test file named Py1359_1720_02

The test file for this example is shown in Listing 4 .

Listing 4 . Contents of the test file named Py1359_1720_02.txt.
>>>from Py1359_1720_02 import sum>>>sum(2,3) 6

This file will actually cause two tests to be performed. The first test is to import the function named sum from the module named Py1359_1720_02 . However, no visible output is expected from this test. Therefore, no output is specified in Listing 4 .

The second test is to call the function named sum (shown in Listing 3 ) passing 2 and 3 as parameters. The test file shows that an incorrect output value of 6 is expected from this test. (As before, an incorrect value was specified to force the test to fail for illustration purposes only.)

The batch file named Py1359_1720_02

The batch file used to execute the test is shown in Listing 5 .

Listing 5 . Contents of the batch filenamed Py1359_1720_02.bat.
echo off rem set the pathpath=%path%;"C:\Program Files (x86)\Python34" rem perform the testpython -m doctest -v Py1359_1720_02.txt pause

This batch file differs from the one shown in Listing 2 in one respect. The -v switch following doctest in the command causes the output to be more verbose than the output from the previousexample.

The output

The execution of the third (python) command in Listing 5 produced the command line output shown in Figure 3 .

Figure 3 . Output produced by the test file named Py1359_1720_02.txt.
Trying: from Py1359_1720_02 import sumExpecting nothing okTrying: sum(2,3)Expecting: 6********************************************************************** File "Py1359_1720_02.txt", line 2, in Py1359_1720_02.txtFailed example: sum(2,3)Expected: 6Got: 5********************************************************************** 1 items had failures:1 of 2 in Py1359_1720_02.txt 2 tests in 1 items.1 passed and 1 failed. ***Test Failed*** 1 failures.

As mentioned earlier, this output is more verbose than the output shown in Figure 2 . In this more verbose output, tests that pass are shown in addition totests that fail. For example, the test of the import statement is shown as ok .

Questions & Answers

How we are making nano material?
what is a peer
What is meant by 'nano scale'?
What is STMs full form?
scanning tunneling microscope
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
The nanotechnology is as new science, to scale nanometric
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
what school?
biomolecules are e building blocks of every organics and inorganic materials.
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
sciencedirect big data base
Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
characteristics of micro business
for teaching engĺish at school how nano technology help us
How can I make nanorobot?
Do somebody tell me a best nano engineering book for beginners?
s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
how can I make nanorobot?
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
what is the actual application of fullerenes nowadays?
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
is Bucky paper clear?
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
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