It seems that some additional code is required in the class Car. It shows that speed can become negative, which is impossible. Next, click the button again, and see the test debug output: Let's look at the debugger output:Ĭlick the button to skip the library classes and go into the class Car: We've placed the breakpoint at the () statement of the test_should_not_allow_negative_speed method. But individual test cases can be executed simply by specifying their names on the terminal: python unittestprogram.py testProgram. To do that, click in the Navigation bar, or right-click the editor background at the method test_should_not_allow_negative_speed and choose Debug from the context menu: Then unittest.main() builds a TestSuite object that contains all the tests that have method names starting with 'test', then a TextTestRunnerwhich then executes each method and prints the results. For example, we'll put a breakpoint in the following place: Next, let's look deeper into the test code and debug one of the tests that failed. This time some tests pass successfully: Debugging tests Right-click the test_Car.py editor tab and choose Run 'Unittests in test_Car.py': If you’re interested in learning about using the `unittest` framework, you can check out their docs.ĭef test_should_not_allow_negative_speed(self):
#Python unittest how to
How to write unit tests is out of scope for this article. Each is the de facto standard unit testing framework for its respective language. JUnit is, in turn, a Java version of Kents Smalltalk testing framework. Now we know that we can run tests, let’s start writing some actual test code. The Python unit testing framework, sometimes referred to as PyUnit, is a Python language version of JUnit, by Kent Beck and Erich Gamma. A Run/Debug configuration will be created automatically: However, we can see that the test fails by default: You can run the test by clicking the Run icon in the gutter near the class definition. Unit testing means testing different blocks of code that provide some functionality, and it might result in errors in the. We are going to test whether our car is able to accelerate and brake, so let's select those checkboxes: To do this, we need to open Car.py, then right-click the name of the class, point to Go To, and then choose Test (or just press Ctrl+Shift+T):Ī popup appears that suggests to create a new test: Creating testsĪ quick way to create tests is to have P圜harm stub them out from the class we’d like to test. To explicitly set the required test runner in the project settings, press Ctrl+Alt+S to open the IDE settings and select Tools | Python Integrated Tools, and then select the target test runner from the Default test runner list.įor more details, see Testing frameworks. If no specific test runner is installed, P圜harm uses unittest. P圜harm auto-detects a test runner that is installed on your Python interpreter and uses it to run tests.
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