diff --git a/ai_formdata.py b/ai_formdata.py
new file mode 100644
index 00000000000..7419f274178
--- /dev/null
+++ b/ai_formdata.py
@@ -0,0 +1,118 @@
+import pytest
+from unittest import mock
+from aiohttp import FormData, web
+from aiohttp.http_writer import StreamWriter
+from aiohttp.pytest_plugin import AiohttpClient
+
+# Mocked AI functionalities (these would be replaced with actual AI models in practice)
+def ai_detect_content_type(data) -> str:
+    # Placeholder for AI content type detection
+    if isinstance(data, bytes):
+        return "application/octet-stream"
+    if isinstance(data, str):
+        return "text/plain"
+    return "application/json"
+
+def ai_validate_filename(filename: str) -> bool:
+    # Placeholder for AI filename validation
+    return filename.isalnum() or filename.endswith('.txt')
+
+def ai_suggest_boundary() -> str:
+    # Placeholder for AI boundary suggestion
+    return "ai_suggested_boundary"
+
+@pytest.fixture
+def buf() -> bytearray:
+    return bytearray()
+
+@pytest.fixture
+def writer(buf: bytearray) -> StreamWriter:
+    writer = mock.create_autospec(StreamWriter, spec_set=True)
+
+    async def write(chunk: bytes) -> None:
+        buf.extend(chunk)
+
+    writer.write.side_effect = write
+    return writer  # type: ignore[no-any-return]
+
+def test_formdata_multipart(buf: bytearray) -> None:
+    form = FormData()
+    assert not form.is_multipart
+
+    form.add_field("test", b"test", filename="test.txt")
+    assert form.is_multipart
+
+def test_invalid_formdata_payload() -> None:
+    form = FormData()
+    form.add_field("test", object(), filename="test.txt")
+    with pytest.raises(TypeError):
+        form()
+
+def test_invalid_formdata_params() -> None:
+    with pytest.raises(TypeError):
+        FormData("asdasf")
+
+def test_invalid_formdata_params2() -> None:
+    with pytest.raises(TypeError):
+        FormData("as")  # 2-char str is not allowed
+
+def test_invalid_formdata_content_type() -> None:
+    form = FormData()
+    invalid_vals = [0, 0.1, {}, [], b"foo"]
+    for invalid_val in invalid_vals:
+        # Use AI model for content type validation
+        suggested_type = ai_detect_content_type(invalid_val)
+        with pytest.raises(TypeError):
+            form.add_field("foo", "bar", content_type=suggested_type)  # type: ignore[arg-type]
+
+def test_invalid_formdata_filename() -> None:
+    form = FormData()
+    invalid_vals = [0, 0.1, {}, [], b"foo"]
+    for invalid_val in invalid_vals:
+        # Use AI model for filename validation
+        if not ai_validate_filename(invalid_val):
+            with pytest.raises(TypeError):
+                form.add_field("foo", "bar", filename=invalid_val)  # type: ignore[arg-type]
+
+async def test_formdata_field_name_is_quoted(
+    buf: bytearray, writer: StreamWriter
+) -> None:
+    form = FormData(charset="ascii")
+    form.add_field("email 1", "xxx@x.co", content_type="multipart/form-data")
+    payload = form()
+    await payload.write(writer)
+    assert b'name="email\\ 1"' in buf
+
+async def test_formdata_field_name_is_not_quoted(
+    buf: bytearray, writer: StreamWriter
+) -> None:
+    form = FormData(quote_fields=False, charset="ascii")
+    form.add_field("email 1", "xxx@x.co", content_type="multipart/form-data")
+    payload = form()
+    await payload.write(writer)
+    assert b'name="email 1"' in buf
+
+async def test_mark_formdata_as_processed(aiohttp_client: AiohttpClient) -> None:
+    async def handler(request: web.Request) -> web.Response:
+        return web.Response()
+
+    app = web.Application()
+    app.add_routes([web.post("/", handler)])
+
+    client = await aiohttp_client(app)
+
+    data = FormData()
+    data.add_field("test", "test_value", content_type="application/json")
+
+    resp = await client.post("/", data=data)
+    assert len(data._writer._parts) == 1
+
+    with pytest.raises(RuntimeError):
+        await client.post("/", data=data)
+
+    resp.release()
+
+async def test_formdata_boundary_param() -> None:
+    boundary = ai_suggest_boundary()  # Use AI suggestion for boundary
+    form = FormData(boundary=boundary)
+    assert form._writer.boundary == boundary