diff --git a/functions/__pycache__/get_files_info.cpython-312.pyc b/functions/__pycache__/get_files_info.cpython-312.pyc
new file mode 100644
index 0000000..a8099de
Binary files /dev/null and b/functions/__pycache__/get_files_info.cpython-312.pyc differ
diff --git a/functions/get_files_info.py b/functions/get_files_info.py
new file mode 100644
index 0000000..21f9523
--- /dev/null
+++ b/functions/get_files_info.py
@@ -0,0 +1,33 @@
+import os
+
+def get_files_info(working_directory, directory="."):
+    try:
+        full_path = os.path.join(working_directory, directory)
+
+        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 list "{directory}" as it is outside the permitted working directory'
+            )
+
+        if not os.path.isdir(abs_target_path):
+            return f'Error: "{directory}" is not a directory'
+
+        results = []
+        for entry in os.listdir(abs_target_path):
+            entry_path = os.path.join(abs_target_path, entry)
+            try:
+                is_dir = os.path.isdir(entry_path)
+                size = os.path.getsize(entry_path)
+                results.append(
+                    f"- {entry}: file_size={size} bytes, is_dir={str(is_dir)}"
+                )
+            except Exception as e:
+                results.append(f"- {entry}: Error accessing file info ({e})")
+
+        return "\n".join(results)
+
+    except Exception as e:
+        return f"Error: {e}"
\ No newline at end of file
diff --git a/tests.py b/tests.py
new file mode 100644
index 0000000..c29a555
--- /dev/null
+++ b/tests.py
@@ -0,0 +1,30 @@
+from functions.get_files_info import get_files_info
+
+
+def run_tests():
+    cases = [
+        ("calculator", "."),
+        ("calculator", "pkg"),
+        ("calculator", "/bin"),
+        ("calculator", "../"),
+    ]
+
+    for working_dir, directory in cases:
+        print(f'get_files_info("{working_dir}", "{directory}"):')
+
+        result = get_files_info(working_dir, directory)
+
+        if directory == ".":
+            print("Result for current directory:")
+        else:
+            print(f"Result for '{directory}' directory:")
+
+        # Indent each line of result
+        for line in result.splitlines():
+            print(f" {line}")
+
+        print()  # Extra newline between test cases
+
+
+if __name__ == "__main__":
+    run_tests()
\ No newline at end of file