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Last Updated: Dec 20, 2023
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Nose2

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Basics of python
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Introduction

Nose2 is a popular Python test runner that can detect and execute unit tests in your project. If you're familiar with Python's standard library, and unit test, and prefer it to other Python test automation frameworks, you should take a look at Nose2 Python.

Nose2 Python is based on unit tests and extends the framework's functionality with a vast plugin ecosystem. In simple terms, Nose2 is a unit test module extension. Our last blog on the Selenium Python Nose tutorial went over the older version of Nose in detail (1.3.7). A small percentage of the development and testing community still uses it.

In this blog, we'll look into the successor to Nose, the Nose2 framework. You should be able to use plugins in Nose2 to enhance your Selenium Python testing experience for Selenium test automation by the end of this Python Nose lesson.

Must Recommended Topic, Floor Division in Python and Convert String to List Python.

How to Install the Nose2 Framework

Before we begin with this Python Nose tutorial, you must first install the Nose2 framework (if you do not already have it). Using the terminal, run the following command to install Nose2.

pip install nose2

 

Import nose2 in the implementation to import the Nose2 package. If a specific module from a package is required, it can be imported using the following syntax:

from nose2.<package_name> import <module_name>
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Execution of Nose2 Python Tests

As Nose2 is different from the Nose test, the command for triggering tests in Nose2 is also different. Below is the command for executing tests in Nose2

nose2 --verbose <filename_without_.py>

 

For example, if the filename that contains Nose2 tests is Test_Nose2_example.py, the command used for executing the tests inside should be:

nose2 --verbose Test_Nose2_example

Test Discovery in Nose2

In Nose2, the nomenclature is used for modules (or files) and test cases beginning with test_ applies. The test classes that surround the test methods should start with the word Test.

A plugin for Nose2 facilitates automatic test module discovery. The plugin looks for test-related modules (or test files) in packages and folders. The loadTestsFromModule() hook is then fired for all discoveries, allowing the other plugins to load the actual tests. More information regarding the discovery-based test loader may be found in Nose2.

Also See, Intersection in Python

Example for Usage of Nose2 Framework

import unittest
from selenium import webdriver
import time
from time import sleep
from selenium.webdriver.common.by import By
 
class ChromeSearch(unittest.TestCase):
    def testSearchLambdatestChrome(self):
        self.driver = webdriver.Chrome()
        self.driver.get('https://www.google.com')
        self.driver.maximize_window()
        title = "Google"
        assert title == self.driver.title
 
        searchText = "LambdaTest"
        searchBox = driver.find_element(By.XPATH, "//input[@name='q']")
        searchBox.send_keys(searchText)
 
        # Using Sleep is absolutely not a good programming practice
        # It is used here only for the demonstration purpose
        time.sleep(5)
        searchBox.submit()
 
        time.sleep(5)
 
        # Click on the LambdaTest HomePage Link
        title = "Most Powerful Cross Browser Testing Tool Online | LambdaTest"
        lt_link = driver.find_element(By.XPATH, "//h3[.='LambdaTest: Most Powerful Cross Browser Testing Tool Online']")
        lt_link.click()
 
        time.sleep(10)
        assert title == driver.title  
        time.sleep(2)
 
        # Release the resources in a teardown function
        print("TearDown has been initiated")
        driver.quit()
 
if __name__ == '__main__':
    import nose2
    nose2.main()  

Also read,  Python filename extensions

Fixtures in Nose2

Fixtures are supported at the class, module, and test (or method) levels in Nose2, as they are in other popular frameworks such as PyTest.

import unittest
from selenium import webdriver
import time
from time import sleep
from selenium.webdriver.common.by import By
from nose2.tools import params
 
class ChromeSearch(unittest.TestCase):
    def setUp(self):
        print("setUp is initiated")
        self.driver = webdriver.Chrome()
        self.driver.maximize_window()
 
def testSearchLambdatestChrome(self):
        self.driver.get('https://www.google.com')
        title = "Google"
        assert title == self.driver.title
 
        searchText = "LambdaTest"
        # search_box = driver.find_element_by_xpath("//input[@name='q']")
        searchBox = self.driver.find_element(By.XPATH, "//input[@name='q']")
        searchBox.send_keys(search_text)
 
        # Using Sleep is absolutely not a good programming practice
        # It is used here for the demonstration purpose
        time.sleep(5)
        searchBox.submit()
 
        time.sleep(5)
 
        # Click on for the LambdaTest HomePage Link
        title = "Most Powerful Cross Browser Testing Tool Online | LambdaTest"
        lt_link = self.driver.find_element(By.XPATH, "//h3[.='LambdaTest: Most Powerful Cross Browser Testing Tool Online']")
        lt_link.click()
 
        time.sleep(10)
        assert title == self.driver.title  
        time.sleep(2)
       
    def testToDoApp(self):
        self.driver.get('https://lambdatest.github.io/sample-todo-app/')
        self.driver.maximize_window()
        self.driver.find_element(By.NAME, "li1").click()
        self.driver.find_element(By.NAME, "li2").click()
 
        title = "Sample page - lambdatest.com"
        assert title ==  self.driver.title
 
        sampleText = "Happy Testing at LambdaTest"
        emailTextField =  self.driver.find_element(By.ID, "sampletodotext")
        emailTextField.send_keys(sampleText)
        time.sleep(5)
 
        self.driver.find_element(By.ID, "addbutton").click()
        time.sleep(5)
 
        assert self.driver.find_element(By.XPATH, "//span[.='Happy Testing at LambdaTest']").text == sample_text
 
    def tearDown(self):
        # Close the opened browser
        print("TearDown initiated")
        self.driver.quit()
       
if __name__ == '__main__':
    import nose2
    nose2.main()

Differences Between Nose2, Nose, and unittest2

  • Nose2 is compatible with all Python versions currently maintained by the Python team, whereas Nose is only compatible with Python 2.4. (and above).
  • Nose2, like unittest2, only supports module and class level fixtures but not package-level fixtures.
  • Unlike Nose, which uses lazy loading, Nose2 does not require a custom importer because it uses __import__ to import test modules ().
  • There is more support for parameterized tests and generator tests than for Nose. Nose2 supports test generators in test classes, test methods, and unittest TestCase subclasses.
    Also see, How to Check Python Version in CMD

Frequently Asked Questions

How can we do Logging and Reporting in Nose2?

Selenium's advanced bug reports aid in the communication between testers and developers. They also aid in the faster resolution of difficulties, hence increasing the overall quality of the web product. We'll look at how to make reports in Nose2 Python in this section of the Python Nose tutorial.

What do we mean by parallel testing in Nose2?

Parallel testing in Selenium allows you to run the same tests in many test environments at the same time. We'll look into parallel testing in Nose2 Python in this segment of the Python Nose Tutorial.The mp plugin was added to Nose2 version 0.3 to allow testing to be distributed across several processes. Though parallel test execution improves execution speed (due to the fact that tests are run in parallel), the benefit is more noticeable in IO-bound tests than in CPU-bound tests.

Which type of testing is done when one of your existing functions stop working?

Regression testing is a sort of testing that is used to ensure that a software change does not affect the product's existing functioning.

What is Django nose?

Django-nose brings all of nose's features to your Django tests, such as testing only your apps by default, rather than all of the standard ones in INSTALLED APPS. Tests are executed in one or more individual modules (or apps, or classes, or folders, or just running a specific test).

Which of the following decorator is used to skip a test if a given condition is false with unit test?

unittest.skipIf(condition, reason)

Conclusion

In this article, we have extensively discussed the Nose2 test runner in python. We saw its uses and key concepts. 

After reading about the Nose2 test runner, are you not feeling excited to read/explore more articles on the topic of Python? Don't worry; Coding Ninjas has you covered. To learn, see Exception Handling in PythonClean-up Action In PythonShort-Circuiting in Python, and Lambda Function in Python.

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