diff --git a/src/string_reversal.py b/src/string_reversal.py
new file mode 100644
index 0000000..ca3c8c0
--- /dev/null
+++ b/src/string_reversal.py
@@ -0,0 +1,19 @@
+def reverse_string(input_string):
+    """
+    Reverse a given 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")
+    
+    # Return the reversed string
+    return input_string[::-1]
\ No newline at end of file
diff --git a/tests/test_string_reversal.py b/tests/test_string_reversal.py
new file mode 100644
index 0000000..dfeea21
--- /dev/null
+++ b/tests/test_string_reversal.py
@@ -0,0 +1,38 @@
+import pytest
+from src.string_reversal import reverse_string
+
+def test_reverse_normal_string():
+    """Test reversing a normal string."""
+    assert reverse_string("hello") == "olleh"
+    assert reverse_string("python") == "nohtyp"
+
+def test_reverse_empty_string():
+    """Test reversing an empty string."""
+    assert reverse_string("") == ""
+
+def test_reverse_single_char():
+    """Test reversing a single character string."""
+    assert reverse_string("a") == "a"
+
+def test_reverse_with_spaces():
+    """Test reversing a string with spaces."""
+    assert reverse_string("hello world") == "dlrow olleh"
+
+def test_reverse_with_special_chars():
+    """Test reversing a string with special characters."""
+    assert reverse_string("hello, world!") == "!dlrow ,olleh"
+
+def test_reverse_with_unicode():
+    """Test reversing a string with unicode characters."""
+    assert reverse_string("こんにちは") == "はちにんこ"
+
+def test_invalid_input_type():
+    """Test that 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"])
\ No newline at end of file