Implement Robust String Reversal Functionality with Comprehensive Test Coverage

src/string_reversal.py

@@ -0,0 +1,26 @@
+def reverse_string(input_string: str) -> str:
+    """
+    Reverse the given input string using a manual character-by-character reversal.
+
+    Args:
+        input_string (str): The string to be reversed.
+
+    Returns:
+        str: The reversed string.
+
+    Raises:
+        TypeError: If the input is not a string.
+    """
+    # Check if input is a string
+    if not isinstance(input_string, str):
+        raise TypeError("Input must be a string")
+
+    # Create a list to store reversed characters
+    reversed_chars = []
+
+    # Iterate through the string from the end to the beginning
+    for i in range(len(input_string) - 1, -1, -1):
+        reversed_chars.append(input_string[i])
+
+    # Join the characters back into a string
+    return ''.join(reversed_chars)

tests/test_string_reversal.py

@@ -0,0 +1,33 @@
+import pytest
+from src.string_reversal import reverse_string
+
+def test_reverse_standard_string():
+    """Test reversing a standard string."""
+    assert reverse_string("hello") == "olleh"
+
+def test_reverse_empty_string():
+    """Test reversing an empty string."""
+    assert reverse_string("") == ""
+
+def test_reverse_palindrome():
+    """Test reversing a palindrome string."""
+    assert reverse_string("racecar") == "racecar"
+
+def test_reverse_with_spaces():
+    """Test reversing a string with spaces."""
+    assert reverse_string("hello world") == "dlrow olleh"
+
+def test_reverse_with_special_characters():
+    """Test reversing a string with special characters."""
+    assert reverse_string("h3llo!") == "!oll3h"
+
+def test_reverse_with_mixed_characters():
+    """Test reversing a string with mixed characters."""
+    assert reverse_string("A1b2C3!@") == "@!3C2b1A"
+
+def test_non_string_input():
+    """Test that a TypeError is raised for non-string inputs."""
+    with pytest.raises(TypeError, match="Input must be a string"):
+        reverse_string(123)
+        reverse_string(None)
+        reverse_string(["hello"])