bpo-45050 created a unittest file for Calculate the number of lines and characters in a file.analyze_text.py

Lib/test/analyze_text.py

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+import os
+import unittest
+
+
+def analyze_text(filename):
+    """Calculate the number of lines and characters in a file.
+    Args:
+        filename: The name of the file to analyze.
+    Raises:
+        IOError: If ``filename`` does not exist or can't be read.
+    Returns: A tuple where the first element is the number of lines in
+        the file and the second element is the number of characters.
+    """
+    lines = 0
+    chars = 0
+    with open(filename, 'r') as f:
+        for line in f:
+            lines += 1
+            chars += len(line)
+    return (lines, chars)
+
+
+class TextAnalysisTests(unittest.TestCase):
+    """Tests for the ``analyze_text()`` function."""
+
+    def setUp(self):
+        """Fixture that creates a file for the text methods to use."""
+        self.filename = 'text_analysis_test_file.txt'
+        with open(self.filename, 'w') as f:
+            f.write('Now we are engaged in a great civil war.\n'
+                    'testing whether that nation,\n'
+                    'or any nation so conceived and so dedicated,\n'
+                    'can long endure.')
+
+    def tearDown(self):
+        """Fixture that deletes the files used by the test methods."""
+        try:
+            os.remove(self.filename)
+        except:
+            pass
+
+    def test_function_runs(self):
+        """Basic smoke test: does the function run."""
+        analyze_text(self.filename)
+
+    def test_line_count(self):
+        """Check that the line count is correct."""
+        self.assertEqual(analyze_text(self.filename)[0], 4)
+
+    def test_character_count(self):
+        """Check that the character count is correct."""
+        self.assertEqual(analyze_text(self.filename)[1], 131)
+
+    def test_no_such_file(self):
+        """Check the proper exception is thrown for a missing file."""
+        with self.assertRaises(IOError):
+            analyze_text('foobar')
+
+    def test_no_deletion(self):
+        """Check that the function doesn't delete the input file."""
+        analyze_text(self.filename)
+        self.assertTrue(os.path.exists(self.filename))
+
+
+if __name__ == '__main__':
+    unittest.main()

Misc/NEWS.d/next/Tests/2021-08-30-16-19-59.bpo-45050.mRsMNG.rst

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+created a unittest file(analyze_text.py) for Calculate the number of lines and characters