Add Tests

The unittest module in Python provides a framework for writing and running unit tests. Unit testing is a method of testing individual units or components of a software to ensure they function correctly in isolation. The unittest module follows the xUnit style of testing and is inspired by the Java JUnit testing framework.

Test cases are created by subclassing the unittest.TestCase class. Each test case consists of one or more test methods that perform specific test scenarios.

setUp and tearDown methods can be defined in a test case class to run code before and after each test method.

Assertions are used to verify that certain conditions are met during the execution of a test. Common assertions include assertEqual, assertNotEqual, assertTrue, assertFalse, etc.

tests/test_grep.py:

import os
import shutil
import tempfile
import unittest

from grepy.grep import grep, grep_count, grep_recursive

class TestGrepFunctions(unittest.TestCase):

    def setUp(self):
        # Create a temporary directory for testing
        self.test_dir = tempfile.mkdtemp()

    def tearDown(self):
        # Remove the temporary directory after testing
        shutil.rmtree(self.test_dir)

    def test_grep_single_file(self):
        # Create a test file
        test_file_path = os.path.join(self.test_dir, 'test_file.txt')
        with open(test_file_path, 'w') as test_file:
            test_file.write("apple\nbanana\norange\n")

        # Test grep function on a single file
        result = grep('apple', test_file_path)
        self.assertEqual(result, {test_file_path: [(1, 'apple')]})

    def test_grep_ignore_case(self):
        # Create a test file
        test_file_path = os.path.join(self.test_dir, 'test_file.txt')
        with open(test_file_path, 'w') as test_file:
            test_file.write("apple\nBanana\norange\n")

        # Test grep function with case-insensitive option
        result = grep('banana', test_file_path, options=['i'])
        self.assertEqual(result, {test_file_path: [(2, 'Banana')]})

    def test_grep_recursive(self):
        # Create nested test directories and files
        subdir_path = os.path.join(self.test_dir, 'subdir')
        os.makedirs(subdir_path, exist_ok=True)
        file1_path = os.path.join(self.test_dir, 'test_file1.txt')
        file2_path = os.path.join(subdir_path, 'test_file2.txt')
        with open(file1_path, 'w') as file1, open(file2_path, 'w') as file2:
            file1.write("apple\nbanana\norange\n")
            file2.write("apple\nkiwi\nbanana\n")

        # Test grep_recursive function
        result = grep_recursive('kiwi', self.test_dir)
        expected_result = {file1_path: [], file2_path: [(2, 'kiwi')]}
        self.assertEqual(result, expected_result)

    def test_grep_count(self):
        # Create test files
        test_file1_path = os.path.join(self.test_dir, 'test_file1.txt')
        test_file2_path = os.path.join(self.test_dir, 'test_file2.txt')
        with open(test_file1_path, 'w') as file1, open(test_file2_path, 'w') as file2:
            file1.write("apple\nbanana\norange\n")
            file2.write("apple\nkiwi\nbanana\n")

        # Test grep_count function
        result = grep_recursive('apple', self.test_dir)
        count = grep_count(result)
        self.assertEqual(count, 2)

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

Run the tests:

python3 -m unittest tests/test_grep.py

Or, you may use the discover subcommand:

cd tests
python3 -m unittest discover

The unittest module supports test discovery, which automatically discovers and runs all test cases in a directory or module.

You should get test results as below:

....
----------------------------------------------------------------------
Ran 4 tests in 0.005s

OK

If there's something wrong, you will get a detailed assertion error messge like this:

...F
======================================================================
FAIL: test_grep_single_file (tests.test_grep.TestGrepFunctions)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/Users/projects/lr_grepy/tests/test_grep.py", line 26, in test_grep_single_file
    self.assertEqual(result, {test_file_path: [(1, 'a2pple')]})
AssertionError: {'/va[27 chars]wgzbhddyr40000gn/T/tmp1qd0uxar/test_file.txt': [(1, 'apple')]} != {'/va[27 chars]wgzbhddyr40000gn/T/tmp1qd0uxar/test_file.txt': [(1, 'a2pple')]}
  {'/var/folders/wx/hdjympxj7h3_ntwgzbhddyr40000gn/T/tmp1qd0uxar/test_file.txt': [(1,
-                                                                                  'apple')]}
+                                                                                  'a2pple')]}
?                                                                                    +


----------------------------------------------------------------------
Ran 4 tests in 0.006s

FAILED (failures=1)

Then, you can fix your implementations based on this error message.

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