To execute multiple test scripts efficiently, Python's unittest module provides the discover method for loading test cases. This approach allows batch execution using TextTestRunner.

Setting Up a Test Project

Create a new Pythonn project in PyCharm named test_project. Inside, create a tests directory with subdirectories module_a and module_b, each containing test scripts like test_alpha.py and test_beta.py.

Example test script:

import unittest

class SampleTest(unittest.TestCase):
    def setUp(self):
        print("Test setup complete.")
    
    def tearDown(self):
        print("Test cleanup complete.")
    
    def test_case_one(self):
        print("Running test case one.")
    
    def test_case_two(self):
        print("Running test case two.")

if __name__ == "__main__":
    unittest.main()

Loading Tests with Discover

Create a runner script execute_tests.py in the project root. Use discover to load tests from a directory.

Parameters for discover:

• start_dir: Directory containing test scripts.
• pattern: File pattern to match (e.g., "test*.py").
• top_level_dir: Optional top-level directory; set to None for default.

Example implementation:

import unittest

def load_test_cases():
    test_dir = "./tests"
    test_suite = unittest.TestSuite()
    discovered_tests = unittest.defaultTestLoader.discover(
        test_dir, 
        pattern="test*.py", 
        top_level_dir=None
    )
    test_suite.addTests(discovered_tests)
    return test_suite

if __name__ == "__main__":
    runner = unittest.TextTestRunner()
    runner.run(load_test_cases())

Running the Test Suite

The discover method recursively searches start_dir for Python files matching pattern. It returns a TestSuite containing all discovered test cases. Use TextTestRunner().run() to execute them.

Alternative directory specification:

import os
test_dir = os.path.join(os.getcwd(), "tests")

This method simplifies batch execution by automating test discovery and suite assembly.