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solutions/tests/test_is_palindrome.py

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+"""
+Test module for the is_palindrome function.
+
+Test categories:
+    - Standard cases: typical strings to verify palindrome status
+    - Edge cases: empty string, single-character strings
+    - Defensive tests: invalid input types
+
+Created on 03-01-25
+Updated on 10-01-25
+
+"""
+
+import unittest
+import sys
+from pathlib import Path
+
+sys.path.append(str(Path(__file__).parent.parent))
+from is_palindrome import is_palindrome
+
+
+class TestIsPalindrome(unittest.TestCase):
+    def test_palindrome(self):
+        """Test for a string that is a palindrome."""
+        result = is_palindrome("madam")
+        self.assertTrue(result)
+
+    def test_non_palindrome(self):
+        """Test for a string that is not a palindrome."""
+        result = is_palindrome("hello")
+        self.assertFalse(result)
+
+    def test_empty_string(self):
+        """Test for an empty string."""
+        result = is_palindrome("")
+        self.assertTrue(result)
+
+    def test_single_character(self):
+        """Test for a single-character string."""
+        result = is_palindrome("a")
+        self.assertTrue(result)
+
+    def test_invalid_input_type(self):
+        """Test for invalid input types."""
+        with self.assertRaises(TypeError):
+            is_palindrome(12345)
+
+
+if __name__ == "__main__":
+    unittest.main()