chore: import upstream snapshot with attribution

tests/unittests/workflow/test_workflow_bytes.py

@@ -0,0 +1,137 @@
+# Copyright 2026 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Tests for Workflow handling of bytes and serialization."""
+
+from __future__ import annotations
+
+from typing import Any
+from typing import AsyncGenerator
+
+from google.adk.agents.context import Context
+from google.adk.events.event import Event
+from google.adk.runners import Runner
+from google.adk.sessions.in_memory_session_service import InMemorySessionService
+from google.adk.workflow import BaseNode
+from google.adk.workflow import START
+from google.adk.workflow._workflow import Workflow
+from google.genai import types
+from pydantic import ConfigDict
+from pydantic import Field
+import pytest
+
+# --- Helpers ---
+
+
+class _BytesOutputNode(BaseNode):
+  """Yields bytes content or raw bytes."""
+
+  raw_bytes: bool = False
+
+  async def _run_impl(
+      self, *, ctx: Context, node_input: Any
+  ) -> AsyncGenerator[Any, None]:
+    data = b"\x89PNG\r\n\x1a\n"
+    if self.raw_bytes:
+      yield data
+    else:
+      yield Event(
+          content=types.Content(
+              parts=[types.Part.from_bytes(data=data, mime_type="image/png")]
+          ),
+          output="bytes_sent",
+      )
+
+
+class _InputCapturingNode(BaseNode):
+  """Captures node_input for later assertion."""
+
+  model_config = ConfigDict(arbitrary_types_allowed=True)
+  received_inputs: list[Any] = Field(default_factory=list)
+
+  async def _run_impl(
+      self, *, ctx: Context, node_input: Any
+  ) -> AsyncGenerator[Any, None]:
+    self.received_inputs.append(node_input)
+    yield {"received": node_input}
+
+
+async def _run_workflow(wf, message="start"):
+  """Run a Workflow through Runner, return collected events."""
+  ss = InMemorySessionService()
+  runner = Runner(app_name="test", node=wf, session_service=ss)
+  session = await ss.create_session(app_name="test", user_id="u")
+  msg = types.Content(parts=[types.Part(text=message)], role="user")
+  events = []
+  async for event in runner.run_async(
+      user_id="u", session_id=session.id, new_message=msg
+  ):
+    events.append(event)
+  return events, ss, session
+
+
+# --- Tests ---
+
+
+@pytest.mark.asyncio
+async def test_bytes_in_content_output():
+  """Content with bytes propagates to downstream node."""
+  a = _BytesOutputNode(name="a", raw_bytes=False)
+  b = _InputCapturingNode(name="b")
+  wf = Workflow(name="wf", edges=[(START, a, b)])
+
+  events, _, _ = await _run_workflow(wf)
+
+  assert b.received_inputs == ["bytes_sent"]
+
+
+@pytest.mark.asyncio
+async def test_raw_bytes_output():
+  """Raw bytes output propagates to downstream node."""
+  a = _BytesOutputNode(name="a", raw_bytes=True)
+  b = _InputCapturingNode(name="b")
+  wf = Workflow(name="wf", edges=[(START, a, b)])
+
+  events, _, _ = await _run_workflow(wf)
+
+  assert len(b.received_inputs) == 1
+  assert isinstance(b.received_inputs[0], bytes)
+
+
+@pytest.mark.xfail(reason="Checkpoint/resume not yet in new Workflow.")
+@pytest.mark.asyncio
+async def test_bytes_in_node_input_serialization():
+  """Bytes in node input survive checkpoint/resume."""
+  assert False, "TODO"
+
+
+@pytest.mark.xfail(reason="Checkpoint/resume not yet in new Workflow.")
+@pytest.mark.asyncio
+async def test_bytes_in_typed_model_input():
+  """Bytes in Pydantic model input survive round-trip."""
+  assert False, "TODO"
+
+
+@pytest.mark.xfail(reason="Checkpoint/resume not yet in new Workflow.")
+@pytest.mark.asyncio
+async def test_bytes_in_trigger_buffer():
+  """Bytes in trigger buffer survive serialization."""
+  assert False, "TODO"
+
+
+@pytest.mark.xfail(reason="Checkpoint/resume not yet in new Workflow.")
+@pytest.mark.asyncio
+async def test_bytes_full_workflow_resume():
+  """Full resume with bytes data end-to-end."""
+  assert False, "TODO"