Python 3 unittest

Today we will learn about python unittest and look through python unit test example programs. In previous tutorial we learned about python zip function. Python unittest module is used to test a unit of source code. Suppose, you need to test your project. You know what kind of data the function will return. After writing huge code, you need to check it whether the output is correct or not. Normally, what we do is printing the output and match it with the reference output file or check the output manually.

To reduce this pain, Python has introduced unittest module. Using this module you can check the output of the function by some simple code. In this tutorial we will discuss about basic usage of Python unittest module and write some python unit test cases to test a class functions. First of all we have to write some code to unit test them. We will have a Python class. We named the class file as Person. And the output of the above code will be like below.

An individual testcase is created by subclassing unittest.

python 3 unittest

By overriding or adding appropriate functions, we can add logic to test. The following code will be succeeded if a is equals to b. Otherwise you can use command prompt to run this module. So the command to run python unittest will be:. Now, we will test those function using unittest. So we have designed two test cases for those two function.

Have a look at the following code, you will understand it easily. Note that the unittest module executes the test functions in the order of their name, not in the order they are defined. Below images show the output produced by our unit test program — both in normal mode and in verbose mode.

To learn more, read the Official Documentation. For any further query please use the comment box. Your email address will not be published. I would love to connect with you personally. Table of Contents 1 Python unittest 1.If you are already familiar with the basic concepts of testing, you might want to skip to the list of assert methods.

Each is the de facto standard unit testing framework for its respective language. The unittest module provides classes that make it easy to support these qualities for a set of tests.

To achieve this, unittest supports some important concepts:. The test case and test fixture concepts are supported through the TestCase and FunctionTestCase classes; the former should be used when creating new tests, and the latter can be used when integrating existing test code with a unittest -driven framework.

When building test fixtures using TestCasethe setUp and tearDown methods can be overridden to provide initialization and cleanup for the fixture.

With FunctionTestCaseexisting functions can be passed to the constructor for these purposes. When the test is run, the fixture initialization is run first; if it succeeds, the cleanup method is run after the test has been executed, regardless of the outcome of the test. Each instance of the TestCase will only be used to run a single test method, so a new fixture is created for each test. Test suites are implemented by the TestSuite class. A test runner is an object that provides a single method, runwhich accepts a TestCase or TestSuite object as a parameter, and returns a result object.

The class TestResult is provided for use as the result object. Alternate runners can be implemented for other environments such as graphical environments without any need to derive from a specific class. This is intended largely for ease of use for those new to unit testing. For production environments it is recommended that tests be driven by a continuous integration system such as BuildbotJenkins or Hudson. The unittest module provides a rich set of tools for constructing and running tests.

This section demonstrates that a small subset of the tools suffice to meet the needs of most users. Here is a short script to test three functions from the random module:. A testcase is created by subclassing unittest.

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The three individual tests are defined with methods whose names start with the letters test. This naming convention informs the test runner about which methods represent tests.Unit test is very useful and helpful in programming. Python provide built-in unittest module for you to test python class and functions.

With third party modules such as html-testRunner and xmlrunneryou can also generate test case reports in html or xml format. This article will tell you how to do that. Run the test suite with test result. This is similar with above methods. The only difference is that you need to load all the test class in each. TestSuite object. I am using htmltestrunner, but I am also interested in obtaining xml output for continuous integration reporting.

Python-unittest-tutorial

The above answer does not seem to answer this question. The above example only shows that the test is run through several times. Which function are you using? In the example, the function that is executed is one running all the tests without giving out reports…. In the above examples all test cases are part of same test suite. Your email address will not be published. This site uses Akismet to reduce spam.

Learn how your comment data is processed. Skip to content. Is it possible for one run to generate both outputs? Yes, you can generate both html and xml report. Use htmltestrunner to generate html report. Use xmlrunner to generate xml report.

Leave a Reply Cancel reply Your email address will not be published.The unittest module is actually a testing framework that was originally inspired by JUnit. It currently supports test automation, the sharing of setup and shutdown code, aggregating tests into collections and the independence of tests from the reporting framework.

I always find a code example or two to be the quickest way to learn how something new works. Then put the following code into it:. This module defines four mathematical functions: add, subtract, multiply and divide. For example, if you were to call the add function with two strings, it would happily concatenate them together and return them.

But for the purposes of illustration, this module will do for creating a test case. Then we subclass TestCase and add three tests, which translates into three methods. The first function tests the addition of two integers; the second function tests the addition of two floating point numbers; and the last function concatenates two strings together.

This is actually important! It tells the test runner which methods are tests that it should run. Each test should have at least one assert which will verify that the result is as we expected.

python 3 unittest

The unittest module supports many different types of asserts. You can test for exceptions, for Boolean conditions, and for many other conditions. Open up a terminal and navigate to the folder that contains your mymath module and your test module:. You will note that there are three periods. Each period represents a test that has passed. Then it tells us that it ran 3 tests, the time it took and the result: OK. That tells us that all the tests passed successfully.

As you can see, this shows us exactly what tests were run and the results of each test. This also leads us into our next section where we will learn about some of the commands we can use with unittest on the command line. The unittest module comes with a few other commands that you might find useful. To find out what they are, you can run the unittest module directly and pass it the -h as shown below:.

This will cause the following output to be printed to stdout. Note that I have cut out a portion of the output that covered Test Discovery command line options for brevity:. Then run the following command:. The cool thing about using the unittest module on the command line is that we can use it to call specific functions in our test.

Alternatively, if you had multiple test cases in this test module, then you could call just one test case at a time, like this:. All this does is call our TestAdd subclass and runs all the test methods in it. So the result should be the same as if we ran it in the first example:.Released: Feb 20, View statistics for this project via Libraries.

Tags pyunit, unittest, junit xml, xunit, report, testrunner, xmlrunner. A unittest test runner that can save test results to XML files in xUnit format. The files can be consumed by a wide range of tools, such as build systems, IDEs and continuous integration servers.

TestCase ; this doesn't map well to an existing xUnit concept, so you won't find it in the schema. What that means, is that you lose some granularity in the reports for sub-tests.

This should parse the XML file without issues. There are many tools claiming to write JUnit reports, so you will find many schemas with minor differences. The easiest way to install unittest-xml-reporting is via Pip :. Or you can manually download the latest released version from PyPI. In fact, the only difference between this script and the original one is the last line:.

We are always looking for good contributions, so please just fork the repository and send pull requests with tests! If you would like write access to the repository, or become a maintainer, feel free to get in touch. Please use tox to test your changes before sending a pull request. Feb 20, Nov 8, Mar 25, Mar 22, Mar 15, Mar 14, Jan 9, May 18, Feb 6, Apr 5, Feb 13, Jan 22, Nov 15, Each is the de facto standard unit testing framework for its respective language.

The unittest module provides classes that make it easy to support these qualities for a set of tests. To achieve this, unittest supports some important concepts:.

The test case and test fixture concepts are supported through the TestCase and FunctionTestCase classes; the former should be used when creating new tests, and the latter can be used when integrating existing test code with a unittest -driven framework. When building test fixtures using TestCasethe setUp and tearDown methods can be overridden to provide initialization and cleanup for the fixture.

With FunctionTestCaseexisting functions can be passed to the constructor for these purposes. When the test is run, the fixture initialization is run first; if it succeeds, the cleanup method is run after the test has been executed, regardless of the outcome of the test. Each instance of the TestCase will only be used to run a single test method, so a new fixture is created for each test.

Test suites are implemented by the TestSuite class. A test runner is an object that provides a single method, runwhich accepts a TestCase or TestSuite object as a parameter, and returns a result object. The class TestResult is provided for use as the result object.

Alternate runners can be implemented for other environments such as graphical environments without any need to derive from a specific class. The unittest module provides a rich set of tools for constructing and running tests. This section demonstrates that a small subset of the tools suffice to meet the needs of most users.

Here is a short script to test three functions from the random module:. A testcase is created by subclassing unittest.

Python 3 Unittest Html And Xml Report Example

The three individual tests are defined with methods whose names start with the letters test. This naming convention informs the test runner about which methods represent tests.

These methods are used instead of the assert statement so the test runner can accumulate all test results and produce a report. When a setUp method is defined, the test runner will run that method prior to each test.

Likewise, if a tearDown method is defined, the test runner will invoke that method after each test.If you are already familiar with the basic concepts of testing, you might want to skip to the list of assert methods.

Each is the de facto standard unit testing framework for its respective language. The unittest module provides classes that make it easy to support these qualities for a set of tests.

To achieve this, unittest supports some important concepts:. The test case and test fixture concepts are supported through the TestCase and FunctionTestCase classes; the former should be used when creating new tests, and the latter can be used when integrating existing test code with a unittest -driven framework.

When building test fixtures using TestCasethe setUp and tearDown methods can be overridden to provide initialization and cleanup for the fixture. With FunctionTestCaseexisting functions can be passed to the constructor for these purposes.

When the test is run, the fixture initialization is run first; if it succeeds, the cleanup method is run after the test has been executed, regardless of the outcome of the test.

Each instance of the TestCase will only be used to run a single test method, so a new fixture is created for each test. Test suites are implemented by the TestSuite class. A test runner is an object that provides a single method, runwhich accepts a TestCase or TestSuite object as a parameter, and returns a result object.

The class TestResult is provided for use as the result object. Alternate runners can be implemented for other environments such as graphical environments without any need to derive from a specific class. The unittest module provides a rich set of tools for constructing and running tests.

This section demonstrates that a small subset of the tools suffice to meet the needs of most users. Here is a short script to test three functions from the random module:.

python 3 unittest

A testcase is created by subclassing unittest. The three individual tests are defined with methods whose names start with the letters test. This naming convention informs the test runner about which methods represent tests. The crux of each test is a call to assertEqual to check for an expected result; assertTrue to verify a condition; or assertRaises to verify that an expected exception gets raised.

These methods are used instead of the assert statement so the test runner can accumulate all test results and produce a report. When a setUp method is defined, the test runner will run that method prior to each test. Likewise, if a tearDown method is defined, the test runner will invoke that method after each test. In the example, setUp was used to create a fresh sequence for each test.

The final block shows a simple way to run the tests. When run from the command line, the above script produces an output that looks like this:. Instead of unittest. For example, the last two lines may be replaced with:.

The above examples show the most commonly used unittest features which are sufficient to meet many everyday testing needs. The remainder of the documentation explores the full feature set from first principles. The unittest module can be used from the command line to run tests from modules, classes or even individual test methods:.

You can pass in a list with any combination of module names, and fully qualified class or method names. The basic building blocks of unit testing are test cases — single scenarios that must be set up and checked for correctness. An instance of a TestCase -derived class is an object that can completely run a single test method, together with optional set-up and tidy-up code.

The testing code of a TestCase instance should be entirely self contained, such that it can be run either in isolation or in arbitrary combination with any number of other test cases. The simplest TestCase subclass will simply override the runTest method in order to perform specific testing code:. If the test fails, an exception will be raised, and unittest will identify the test case as a failure.


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