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import io
import re
from contextlib import redirect_stdout

from inference import log_end, log_start, log_step


def test_log_format_lines() -> None:
    buffer = io.StringIO()

    with redirect_stdout(buffer):
        log_start("easy", "b2b_support_triage_env", "Qwen")
        log_step(1, '{"action_type":"submit"}', 0.5, False, None)
        log_end(True, 1, 0.99, [0.5])

    lines = [line for line in buffer.getvalue().strip().splitlines() if line]
    assert len(lines) == 3

    assert re.match(r"^\[START\] task=easy env=b2b_support_triage_env model=Qwen$", lines[0])
    assert re.match(r"^\[STEP\] step=1 action=\{.*\} reward=0\.50 done=false error=null$", lines[1])
    assert re.match(r"^\[END\] success=true steps=1 score=0\.990 rewards=0\.50$", lines[2])