i want to write code for unit test to test my application code. I have different methods and now want to test these methods one by one in python script.
but i do not how to i write. can any one give me example of small code for unit testing in python.
i am thankful
Read the unit testing framework section of the Python Library Reference.
A basic example from the documentation:
import random
import unittest
class TestSequenceFunctions(unittest.TestCase):
def setUp(self):
self.seq = range(10)
def testshuffle(self):
# make sure the shuffled sequence does not lose any elements
random.shuffle(self.seq)
self.seq.sort()
self.assertEqual(self.seq, range(10))
def testchoice(self):
element = random.choice(self.seq)
self.assert_(element in self.seq)
def testsample(self):
self.assertRaises(ValueError, random.sample, self.seq, 20)
for element in random.sample(self.seq, 5):
self.assert_(element in self.seq)
if __name__ == '__main__':
unittest.main()
It's probably best to start off with the given unittest example. Some standard best practices:
put all your tests in a tests folder at the root of your project.
write one test module for each python module you're testing.
test modules should start with the word test.
test methods should start with the word test.
When you've become comfortable with unittest (and it shouldn't take long), there are some nice extensions to it that will make life easier as your tests grow in number and scope:
nose -- easily find and run all your tests, and more.
testoob -- colorized output (and more, but that's why I use it).
pythoscope -- haven't tried it, but this will automatically generate (failing) test stubs for your application. Should save a lot of time writing boilerplate code.
Here's an example and you might want to read a little more on pythons unit testing.
Related
I'd like to prevent/skip some tests cases during runinng others in python. I couldn't achive to use #unittest.skip(reason) on my case. It always generates a Script Error in python unittest.
My code;
import unittest
#unittest.skip("something")
def main():
try:
something = []
for _ in range(4):
test.log("something happened")
The result is;
Error Script Error
Detail: SkipTest: something
Do you have any idea about the issue?
Unittest is a module that act as testing framework. You should use it according to the framework practices (taken from tutorialspoint.com):
import unittest
def add(x,y):
return x+y
class SimpleTest(unittest.TestCase):
#unittest.skip("demonstrating skipping")
def testadd1(self):
self.assertEquals(add(4,5),9)
if __name__ == '__main__':
unittest.main()
Squish test scripts written in Python are unrelated to the unittest module. I cannot tell how the two could be used together.
Squish offers the test.skip() function for skipping test cases:
test.skip(message);
test.skip(message, detail);
This function skips further execution of the current script test case, or the current BDD scenario (or BDD scenario outline iteration), by throwing an exception and adding a SKIPPED entry to Squish's test log with the given message string, and with the given detail, if provided. If the test case logged verification failures before the skip, it is still considered failed.
I can't find a way to add string to my HTML report that represent my test steps.
I saw in https://pypi.org/project/pytest-html/
that I should try with:
extra.text('Add some simple Text')
but seems that it doesn't work.
from pytest_html import extras
class FirstFeatureTests:
def setup_class(self):
print("\n------------ in setup_class ------------")
def teardown_class(self):
print("------------ in teardown_class ------------")
#mark.example
def test_1_first_feature(self):
print("starting test !!!!!")
extras.text("step 1: ")
extras.text('step 2: ')
assert True
I expect that each test will contains test steps represented as string with iformative description.
is there any way to do so?
Allure is certainly better suited for your needs as it has all the test reporting features (steps, feature, stories, etc.) for pytest. But it is written in java and you need to install pytest allure as well as allure binary locally for it to work. And you may have to jump few hoops to make it work in your existing pytest codebase.
If you want to use pytest-html for generating test steps, this is a possible solution:
# Contents of top level conftest.py
import pytest
#pytest.fixture(scope='session', autouse=True)
def step(request):
#pytest.mark.optionalhook
def pytest_html_results_table_html(request, report, data):
data.append(html.div(str(request.param), class_='Step'))
#Contents of fixture or test code
def test_a(step):
step("abc")
assert True
I have not run the code locally but this is what final code for adding step should look like.
I would suggest you to try allure instead of pytest-html in this case. it has easy integration with pytest and the api is really comfortable to use.
check out this repository for more information.
and this one for usage examples.
Hello I have a test module like the following under "test.py":
class TestBasic(unittest.TestCase):
def setUp(self):
# set up in here
class TestA(TestBasic):
def test_one(self):
self.assertEqual(1,1)
def test_two(self):
self.assertEqual(2,1)
if __name__ == "__main__":
unittest.main()
And this works pretty good, but I need a way to print which test passed, for example I could print the output to the console:
test_one: PASSED
test_two: FAILED
Now the twist, I could add a print statement right after the self.assertEqual() and that would be a passed test and I could just print it, but I need to run the test from a different module, let's say "test_reporter.py" where I have something like this:
import test
suite = unittest.TestLoader().loadTestsFromModule(test)
results = unittest.TextTestRunner(verbosity=0).run(suite)
at this point with results is when I build a report.
So please any suggestion is welcome
Thanks !!
Like Corey's comment mentioned, if you set verbosity=2 unittest will print the result of each test run.
results = unittest.TextTestRunner(verbosity=2).run(suite)
If you want a little more flexibility - and you might since you are creating suites and using test runners - I recommend that you take a look at Twisted Trial. It extends Python's unittest module and provides a few more assertions and reporting features.
Writing your tests will be exactly the same (besides subclassing twisted.trial.unittest.TestCase vs python's unittest) so your workflow won't change. You can still use your TestLoader but you'll have the options of many more TestReporters http://twistedmatrix.com/documents/11.1.0/api/twisted.trial.reporter.html.
For example, the default TestReporter is TreeReporter which returns the following output:
In nosetests, I know that you can specify which tests you want to run via a nosetests config file as such:
[nosetests]
tests=testIWT_AVW.py:testIWT_AVW.tst_bynd1,testIWT_AVW.py:testIWT_AVW.tst_bynd3
However, the above just looks messy and becomes harder to maintain when a lot of tests are added, especially without being able to use linebreaks. I found it a lot more convenient to be able to specify which tests I want to run using unittests TestSuite feature. e.g.
def custom_suite():
suite = unittest.TestSuite()
suite.addTest(testIWT_AVW('tst_bynd1'))
suite.addTest(testIWT_AVW('tst_bynd3'))
return suite
if __name__=="__main__":
runner = unittest.TextTestRunner()
runner.run(custom_suite())
Question: How do I specify which tests should be run by nosetests within my .py file? Thanks.
P.S. If there is a way to specify tests via a nosetest config file that doesn't force all tests to be written on one line I would be open to it as well, as a second alternative
I'm not entirely sure whether you want to run the tests programmatically or from the command line. Either way this should cover both:
import itertools
from nose.loader import TestLoader
from nose import run
from nose.suite import LazySuite
paths = ("/path/to/my/project/module_a",
"/path/to/my/project/module_b",
"/path/to/my/project/module_c")
def run_my_tests():
all_tests = ()
for path in paths:
all_tests = itertools.chain(all_tests, TestLoader().loadTestsFromDir(path))
suite = LazySuite(all_tests)
run(suite=suite)
if __name__ == '__main__':
run_my_tests()
Note that the nose.suite.TestLoader object has a number of different methods available for loading tests.
You can call the run_my_tests method from other code or you can run this from the command line with a python interpreter, rather than through nose. If you have other nose configuration, you may need to pass that in programmatically as well.
If I'm correctly understanding your question, you have several options here:
you can mark your tests with special nose decorators: istest and nottest. See docs
you can mark tests with tags
you can join test cases in test suites. I haven't used it by myself, but it seems that you have to override nose's default test discovery to respect your test suites (see docs)
Hope that helps.
I'm doing TDD using Python and the unittest module. In NUnit you can Assert.Inconclusive("This test hasn't been written yet").
So far I haven't been able to find anything similar in Python to indicate that "These tests are just placeholders, I need to come back and actually put the code in them."
Is there a Pythonic pattern for this?
With the new and updated unittest module you can skip tests:
#skip("skip this test")
def testSomething(self):
pass # TODO
def testBar(self):
self.skipTest('We need a test here, really')
def testFoo(self):
raise SkipTest('TODO: Write a test here too')
When the test runner runs these, they are counted separately ("skipped: (n)").
I would not let them pass or show OK, because you will not find them easily back.
Maybe just let them fail and the reason (not written yet), which seems logical because you have a test that is not finished.
I often use self.fail as a todo list
def test_some_edge_case(self):
self.fail('Need to check for wibbles')
Works well for me when I'm doing tdd.