diff --git a/src/fml_doc_gen/write_docstring_to_file.py b/src/fml_doc_gen/write_docstring_to_file.py
index ba4de45..76d2eb2 100644
--- a/src/fml_doc_gen/write_docstring_to_file.py
+++ b/src/fml_doc_gen/write_docstring_to_file.py
@@ -1,5 +1,6 @@
+import os
 
-def write_docstring_to_file(docstring: str, output_file: str) -> None:
+def write_docstring_to_file(docstring: str, output_file: str = None) -> None:
     """
     Writes the generated docstring to a specified output file.
 
@@ -31,4 +32,22 @@ def write_docstring_to_file(docstring: str, output_file: str) -> None:
     # This writes the docstring to 'docstring_output.txt'
     """
 
-    pass
+
+    print(docstring)
+    print("\n*** End of Docstring ***\n")
+
+    if output_file:
+        output_dir = os.path.dirname(output_file) or "."
+        if not os.path.exists(output_dir):
+            raise ValueError(f"This directory '{output_dir}' does not exist.")
+        
+        if not os.access(output_dir, os.W_OK):
+            raise ValueError(f"This directory '{output_dir}' is not writable")
+            
+        try:
+            with open(output_file, 'w') as file:
+                file.write(docstring)
+        except ValueError as e:
+            print(f"An error occurred while writing to the file: {e}")
+
+        
diff --git a/tests/test_write_docstring_to_file.py b/tests/test_write_docstring_to_file.py
new file mode 100644
index 0000000..78e320e
--- /dev/null
+++ b/tests/test_write_docstring_to_file.py
@@ -0,0 +1,62 @@
+import os
+from tempfile import NamedTemporaryFile, TemporaryDirectory
+import pytest
+from fml_doc_gen.write_docstring_to_file import write_docstring_to_file
+
+
+@pytest.fixture
+def valid_docstring():
+    """Fixture for a valid docstring."""
+    return """
+    Writes the generated docstring to a specified output file.
+
+    Parameters
+    ----------
+    docstring : str
+        The docstring to be written to the file.
+    output_file : str
+        The path to the output file.
+
+    Returns
+    -------
+    None
+        This function does not return anything.
+    """
+
+
+def test_write_to_valid_file(valid_docstring):
+    """Test writing the docstring to a valid file"""
+    with NamedTemporaryFile(suffix=".txt",delete=False) as temp_file:
+        file_path = temp_file.name  
+
+    try:
+        write_docstring_to_file(valid_docstring, output_file=file_path)
+
+        with open(file_path, "r") as file:
+            content = file.read()
+
+        assert content.strip() == valid_docstring.strip()
+    finally:
+        if os.path.exists(file_path):
+            os.remove(file_path)
+
+
+def test_invalid_directory(valid_docstring):
+    """Test writing to a file in a non-existent directory."""
+    with TemporaryDirectory() as temp_dir:
+        non_existent_dir = os.path.join(temp_dir, "nonexistent")
+        file_path = os.path.join(non_existent_dir, "docstring_output.txt")
+        with pytest.raises(ValueError, match=f"This directory '{non_existent_dir}' does not exist"):
+            write_docstring_to_file(valid_docstring, output_file=file_path)
+
+def test_non_writable_directory(valid_docstring):
+    """Test writing to a file in a non-writable directory."""
+    with TemporaryDirectory() as temp_dir:
+        # Make the temp_dir directory non writable
+        os.chmod(temp_dir, 0o500)  
+        file_path = os.path.join(temp_dir, "docstring_output.txt")
+        try:
+            with pytest.raises(ValueError, match=f"This directory '{temp_dir}' is not writable"):
+                write_docstring_to_file(valid_docstring, output_file=file_path)
+        finally:
+            os.chmod(temp_dir, 0o700)  
\ No newline at end of file