marchwarden/tests/test_trace.py

"""Tests for the trace logger."""

import json
import os
import tempfile
import uuid

from researchers.web.trace import TraceLogger


class TestTraceLogger:
    def _make_logger(self, tmp_dir, **kwargs):
        return TraceLogger(trace_dir=tmp_dir, **kwargs)

    def test_generates_trace_id(self):
        with tempfile.TemporaryDirectory() as tmp:
            logger = self._make_logger(tmp)
            # Should be a valid UUID
            uuid.UUID(logger.trace_id)

    def test_uses_provided_trace_id(self):
        with tempfile.TemporaryDirectory() as tmp:
            logger = self._make_logger(tmp, trace_id="my-custom-id")
            assert logger.trace_id == "my-custom-id"

    def test_creates_trace_dir(self):
        with tempfile.TemporaryDirectory() as tmp:
            nested = os.path.join(tmp, "deep", "nested", "dir")
            logger = TraceLogger(trace_dir=nested)
            assert os.path.isdir(nested)
            logger.close()

    def test_file_path(self):
        with tempfile.TemporaryDirectory() as tmp:
            logger = self._make_logger(tmp, trace_id="test-123")
            assert str(logger.file_path).endswith("test-123.jsonl")

    def test_log_step_creates_file(self):
        with tempfile.TemporaryDirectory() as tmp:
            with self._make_logger(tmp) as logger:
                logger.log_step("search", query="test")
            assert logger.file_path.exists()

    def test_log_step_increments_counter(self):
        with tempfile.TemporaryDirectory() as tmp:
            with self._make_logger(tmp) as logger:
                e1 = logger.log_step("search")
                e2 = logger.log_step("fetch")
                e3 = logger.log_step("synthesize")
            assert e1["step"] == 1
            assert e2["step"] == 2
            assert e3["step"] == 3

    def test_log_step_required_fields(self):
        with tempfile.TemporaryDirectory() as tmp:
            with self._make_logger(tmp) as logger:
                entry = logger.log_step("search", decision="relevant query")
            assert entry["action"] == "search"
            assert entry["decision"] == "relevant query"
            assert "timestamp" in entry
            assert "step" in entry

    def test_log_step_extra_kwargs(self):
        with tempfile.TemporaryDirectory() as tmp:
            with self._make_logger(tmp) as logger:
                entry = logger.log_step(
                    "fetch_url",
                    url="https://example.com",
                    content_hash="sha256:abc123",
                    content_length=5000,
                )
            assert entry["url"] == "https://example.com"
            assert entry["content_hash"] == "sha256:abc123"
            assert entry["content_length"] == 5000

    def test_entries_are_valid_jsonl(self):
        with tempfile.TemporaryDirectory() as tmp:
            with self._make_logger(tmp) as logger:
                logger.log_step("search", query="test")
                logger.log_step("fetch_url", url="https://example.com")
                logger.log_step("synthesize", decision="done")

            with open(logger.file_path) as f:
                lines = [l.strip() for l in f if l.strip()]

            assert len(lines) == 3
            for line in lines:
                parsed = json.loads(line)
                assert "step" in parsed
                assert "action" in parsed
                assert "timestamp" in parsed

    def test_read_entries(self):
        with tempfile.TemporaryDirectory() as tmp:
            with self._make_logger(tmp) as logger:
                logger.log_step("search", query="q1")
                logger.log_step("fetch_url", url="https://example.com")

            entries = logger.read_entries()
            assert len(entries) == 2
            assert entries[0]["action"] == "search"
            assert entries[0]["query"] == "q1"
            assert entries[1]["action"] == "fetch_url"

    def test_read_entries_empty_file(self):
        with tempfile.TemporaryDirectory() as tmp:
            logger = self._make_logger(tmp)
            entries = logger.read_entries()
            assert entries == []

    def test_context_manager_closes_file(self):
        with tempfile.TemporaryDirectory() as tmp:
            with self._make_logger(tmp) as logger:
                logger.log_step("search")
            assert logger._file is None

    def test_timestamp_format(self):
        with tempfile.TemporaryDirectory() as tmp:
            with self._make_logger(tmp) as logger:
                entry = logger.log_step("search")
            # ISO 8601 UTC format
            ts = entry["timestamp"]
            assert ts.endswith("Z")
            assert "T" in ts

    def test_flush_after_each_write(self):
        """Entries should be readable immediately, not buffered."""
        with tempfile.TemporaryDirectory() as tmp:
            logger = self._make_logger(tmp)
            logger.log_step("search", query="test")
            # Read without closing
            entries = logger.read_entries()
            assert len(entries) == 1
            logger.close()

    def test_multiple_loggers_different_files(self):
        with tempfile.TemporaryDirectory() as tmp:
            with self._make_logger(tmp, trace_id="trace-a") as a:
                a.log_step("search", query="a")
            with self._make_logger(tmp, trace_id="trace-b") as b:
                b.log_step("search", query="b")

            assert a.read_entries()[0]["query"] == "a"
            assert b.read_entries()[0]["query"] == "b"
            assert a.file_path != b.file_path