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"""Direct unit coverage for REPL streaming helpers.""" |
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from __future__ import annotations |
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from types import SimpleNamespace |
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from unittest.mock import patch |
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from dlm.repl.streaming import CaptureStreamer, build_streamer, concatenate_tokens, should_stream |
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def test_should_stream_tracks_stdout_tty_state() -> None: |
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with patch("sys.stdout", new=SimpleNamespace(isatty=lambda: True)): |
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assert should_stream() is True |
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with patch("sys.stdout", new=SimpleNamespace(isatty=lambda: False)): |
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assert should_stream() is False |
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def test_should_stream_handles_broken_stdout() -> None: |
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class MissingIsAtty: |
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pass |
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class RaisesValueError: |
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@staticmethod |
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def isatty() -> bool: |
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raise ValueError("closed") |
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with patch("sys.stdout", new=MissingIsAtty()): |
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assert should_stream() is False |
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with patch("sys.stdout", new=RaisesValueError()): |
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assert should_stream() is False |
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def test_capture_streamer_is_noop_and_keeps_text_buffer() -> None: |
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streamer = CaptureStreamer() |
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streamer.put(["ignored"]) |
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streamer.end() |
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assert streamer.text == "" |
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def test_build_streamer_returns_capture_streamer_when_disabled() -> None: |
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assert isinstance(build_streamer(object(), stream_to_stdout=False), CaptureStreamer) |
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def test_build_streamer_wraps_transformers_text_streamer() -> None: |
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calls: list[tuple[object, bool, bool]] = [] |
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class FakeTextStreamer: |
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def __init__( |
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self, tokenizer: object, *, skip_prompt: bool, skip_special_tokens: bool |
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) -> None: |
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calls.append((tokenizer, skip_prompt, skip_special_tokens)) |
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fake_transformers = SimpleNamespace(TextStreamer=FakeTextStreamer) |
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tokenizer = object() |
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with patch.dict("sys.modules", {"transformers": fake_transformers}): |
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streamer = build_streamer(tokenizer, stream_to_stdout=True) |
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assert isinstance(streamer, FakeTextStreamer) |
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assert calls == [(tokenizer, True, True)] |
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def test_concatenate_tokens_joins_token_pieces() -> None: |
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assert concatenate_tokens(["hello", " ", "world"]) == "hello world" |