diff --git a/functions/write_file.py b/functions/write_file.py
new file mode 100644
index 0000000..be8c43f
--- /dev/null
+++ b/functions/write_file.py
@@ -0,0 +1,27 @@
+import os
+
+
+def write_file(working_directory, file_path, content):
+    try:
+        full_path = os.path.join(working_directory, file_path)
+        abs_working_directory = os.path.abspath(working_directory)
+        abs_target_path = os.path.abspath(full_path)
+
+        if not abs_target_path.startswith(abs_working_directory):
+            return (
+                f'Error: Cannot write to "{file_path}" as it is outside the permitted working directory'
+            )
+
+        parent_dir = os.path.dirname(abs_target_path)
+        if parent_dir and not os.path.exists(parent_dir):
+            os.makedirs(parent_dir, exist_ok=True)
+
+        with open(abs_target_path, "w", encoding="utf-8") as f:
+            f.write(content)
+
+        return (
+            f'Successfully wrote to "{file_path}" ({len(content)} characters written)'
+        )
+
+    except Exception as e:
+        return f"Error: {e}"
\ No newline at end of file
diff --git a/tests.py b/tests.py
index 92ab937..ac00bbe 100644
--- a/tests.py
+++ b/tests.py
@@ -1,25 +1,24 @@
-from functions.get_file_content import get_file_content
+from functions.write_file import write_file
 
 
 def run_tests():
     cases = [
-        ("calculator", "main.py"),
-        ("calculator", "pkg/calculator.py"),
-        ("calculator", "/bin/cat"),
-        ("calculator", "pkg/does_not_exist.py"),
+        ("calculator", "lorem.txt", "wait, this isn't lorem ipsum"),
+        ("calculator", "pkg/morelorem.txt", "lorem ipsum dolor sit amet"),
+        ("calculator", "/tmp/temp.txt", "this should not be allowed"),
     ]
 
-    for working_dir, file_path in cases:
-        print(f'get_file_content("{working_dir}", "{file_path}"):')
+    for working_dir, file_path, content in cases:
+        print(f'write_file("{working_dir}", "{file_path}", "{content}"):')
 
-        result = get_file_content(working_dir, file_path)
+        result = write_file(working_dir, file_path, content)
 
         print("Result:")
-        # Indent each line of output
+
         for line in result.splitlines():
             print(" " + line)
 
-        print()  # Blank line between cases
+        print()
 
 
 if __name__ == "__main__":