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Most software development doesn't involve writing new code - it's modifying existing code. Ensuring that existing code continues to work in the way we expect is a key part of the software development process. One way to do ensure the behavior of our app is with a *test suite*.
Running the test suite
It turns out the project from the core tutorial already has a test suite! When we originally generated our project, two top-level directories were generated: ``src`` and ``tests``. The ``src`` folder contains the code for our app; the ``tests`` folder contains our test suite. Inside the ``tests`` folder is a file named ``test_app.py`` with the following content::
This is a `Pytest <https://pytest.org>`__ *test case* - a block of code that can be executed to verify some behavior of your app. In this case, the test is a placeholder, and doesn't test anything about our app - but it is a test that we can perform.
We can run this test suite using the ``--test`` option to ``briefcase dev``. As this is the first time we are running tests, we also need to pass in the ``-r`` option to ensure that the test requirements are also installed:
macOS
Linux
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Success! We've just executed a single test that verifies Python math works in the way we'd expect (What a relief!).
Let's replace this placeholder test with a test to verify that our ``greeting()`` method behaves the way we'd expect. Replace the contents of ``test_app.py`` with the following::
This defines two new tests, verifying the two behaviors we expect to see: the output when a name is provided, and the output when the name is empty.

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  1. BeeWare
  2. Tutorial
  3. Topics
  4. testing
  5. English
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../../tutorial/topics/testing.rst:34 • ../../tutorial/topics/testing.rst:139 • ../../tutorial/topics/testing.rst:209 • ../../tutorial/topics/testing.rst:326 • ../../tutorial/topics/testing.rst:396 • 0910657b706845c3ace7e6647605a676 • 44922990ed9145e9851f611612bb4958 • 6b8ed72bdb45403c8514d0b0fb1c707c • 75cda337703e4d9e82200b55a7dc93e6 • f285a2fb7b4243cab92c587103782fea
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