Implement Robust String Reversal Function with Comprehensive Testing

src/string_reversal.py

@@ -0,0 +1,19 @@
+def reverse_string(input_string: str) -> str:
+    """
+    Reverses the given input string.
+
+    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")
+
+    # Reverse the string using slicing
+    return input_string[::-1]

tests/test_string_reversal.py

@@ -0,0 +1,37 @@
+import pytest
+from src.string_reversal import reverse_string
+
+def test_basic_string_reversal():
+    """Test reversing a standard string."""
+    assert reverse_string("hello") == "olleh"
+
+def test_empty_string():
+    """Test reversing an empty string."""
+    assert reverse_string("") == ""
+
+def test_single_character():
+    """Test reversing a single character string."""
+    assert reverse_string("a") == "a"
+
+def test_string_with_spaces():
+    """Test reversing a string with spaces."""
+    assert reverse_string("hello world") == "dlrow olleh"
+
+def test_string_with_special_characters():
+    """Test reversing a string with special characters."""
+    assert reverse_string("a1b2c3!@#") == "#@!3c2b1a"
+
+def test_unicode_string():
+    """Test reversing a unicode string."""
+    assert reverse_string("こんにちは") == "はちにんこ"
+
+def test_invalid_input_type():
+    """Test that a TypeError is raised for non-string inputs."""
+    with pytest.raises(TypeError, match="Input must be a string"):
+        reverse_string(123)
+
+    with pytest.raises(TypeError, match="Input must be a string"):
+        reverse_string(None)
+
+    with pytest.raises(TypeError, match="Input must be a string"):
+        reverse_string(["hello"])