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cowork-local/tests/unit/test_fakes.py
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"""Unit tests for FakeProvider and FakeToolExecutor test doubles."""
from __future__ import annotations
import pytest
from providers.base import ProviderError
from tests.fakes.fake_provider import FakeProvider
from tests.fakes.fake_tool_executor import FakeToolExecutor
def test_fake_provider_text_streaming() -> None:
"""Verify that FakeProvider streams text chunks to on_text callback."""
provider = FakeProvider()
provider.queue_response(content="Hello world", chunks=["Hello ", "world"])
streamed: list[str] = []
response = provider.chat(
messages=[{"role": "user", "content": "Hi"}],
on_text=lambda piece: streamed.append(piece),
)
assert response["role"] == "assistant"
assert response["content"] == "Hello world"
assert "".join(streamed) == "Hello world"
assert provider.call_count == 1
def test_fake_provider_tool_calls_and_reasoning() -> None:
"""Verify reasoning streaming and tool_calls payload emission."""
provider = FakeProvider()
tool_call = {
"id": "call_123",
"name": "save_file",
"arguments": {"filename": "out.txt", "content": "data"},
}
provider.queue_response(
content="Creating file",
tool_calls=[tool_call],
reasoning="User wants output in a file",
)
reasoning_chunks: list[str] = []
response = provider.chat(
messages=[{"role": "user", "content": "Save to out.txt"}],
on_reasoning=lambda piece: reasoning_chunks.append(piece),
)
assert response["content"] == "Creating file"
assert response["tool_calls"] == [tool_call]
assert reasoning_chunks == ["User wants output in a file"]
def test_fake_provider_error_injection() -> None:
"""Verify that queued exceptions are raised on demand."""
provider = FakeProvider()
provider.queue_error(ProviderError("Rate limit exceeded (429)"))
with pytest.raises(ProviderError, match="Rate limit exceeded"):
provider.chat(messages=[{"role": "user", "content": "Hi"}])
def test_fake_provider_cancellation() -> None:
"""Verify that cancellation stops execution immediately."""
provider = FakeProvider()
provider.queue_response(content="Long reply", chunks=["Part 1", "Part 2"])
is_cancelled = False
def cancel_fn() -> bool:
return is_cancelled
is_cancelled = True
with pytest.raises(ProviderError, match="aborted by user cancel"):
provider.chat(
messages=[{"role": "user", "content": "Hi"}],
cancel=cancel_fn,
)
def test_fake_tool_executor() -> None:
"""Verify that FakeToolExecutor records calls and returns expected mock outputs."""
executor = FakeToolExecutor()
executor.set_mock_response("read_file", {"ok": True, "content": "file contents"})
executor.register_handler("calc", lambda args: {"ok": True, "result": args.get("a", 0) + args.get("b", 0)})
res1 = executor.execute("read_file", {"path": "test.txt"})
assert res1["ok"] is True
assert res1["content"] == "file contents"
res2 = executor.execute("calc", {"a": 5, "b": 10})
assert res2["result"] == 15
assert len(executor.call_log) == 2
assert executor.get_calls_for("calc")[0]["args"] == {"a": 5, "b": 10}