problems

problems/easy/palindrome-checker/solution.py

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+"""
+Palindrome Checker
+
+You're building a word game that awards bonus points for palindromes.
+Given a string, determine if it reads the same forwards and backwards,
+ignoring case and non-alphanumeric characters.
+
+Example 1:
+    Input: text = "A man, a plan, a canal: Panama"
+    Output: True
+    Explanation: "amanaplanacanalpanama" is a palindrome
+
+Example 2:
+    Input: text = "race a car"
+    Output: False
+    Explanation: "raceacar" is not a palindrome
+
+Example 3:
+    Input: text = " "
+    Output: True
+    Explanation: Empty after removing non-alphanumeric
+
+Constraints:
+    - Input is always a string
+    - Ignore spaces, punctuation, and case
+    - Empty string is considered a palindrome
+"""
+
+
+def is_palindrome(text: str) -> bool:
+    """Return True if text is a palindrome, False otherwise."""
+    pass  # Your implementation here
+

problems/easy/palindrome-checker/tests.py

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+"""Tests for palindrome-checker."""
+import pytest
+from solution import is_palindrome
+
+
+class TestBasicCases:
+    """Test basic functionality with typical inputs."""
+
+    def test_simple_palindrome(self):
+        """Test basic palindrome word."""
+        assert is_palindrome("racecar") == True
+
+    def test_sentence_palindrome(self):
+        """Test palindrome with spaces and punctuation."""
+        assert is_palindrome("A man, a plan, a canal: Panama") == True
+
+    def test_not_palindrome(self):
+        """Test non-palindrome string."""
+        assert is_palindrome("hello") == False
+
+
+class TestEdgeCases:
+    """Test edge cases and boundary conditions."""
+
+    def test_empty_string(self):
+        """Test with empty input."""
+        assert is_palindrome("") == True
+
+    def test_single_character(self):
+        """Test with single character."""
+        assert is_palindrome("a") == True
+
+    def test_only_spaces(self):
+        """Test with only whitespace."""
+        assert is_palindrome("   ") == True
+
+    def test_mixed_case(self):
+        """Test case insensitivity."""
+        assert is_palindrome("RaceCar") == True
+
+    def test_numbers_in_string(self):
+        """Test with numbers."""
+        assert is_palindrome("12321") == True
+