claude-code-chat-browser/tests/test_session_cache.py at fe31c5bfcb66fc0b16a0ea321f34dab8a185ed83 · cppalliance/claude-code-chat-browser · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
"""Unit tests for utils.session_cache."""

from __future__ import annotations

import os
import shutil
from pathlib import Path

import pytest

from utils.jsonl_parser import parse_session
from utils.session_cache import clear_cache, get_cached_session, set_max_entries

FIXTURES = Path(__file__).resolve().parent / "fixtures"
SAMPLE_SESSION = FIXTURES / "session_with_tools.jsonl"


@pytest.fixture
def sample_session(tmp_path: Path) -> Path:
    dest = tmp_path / "session.jsonl"
    shutil.copy(SAMPLE_SESSION, dest)
    return dest


@pytest.fixture(autouse=True)
def _reset_cache() -> None:
    clear_cache()
    set_max_entries(200)


def test_cache_returns_same_data_as_direct_parse(sample_session: Path) -> None:
    path = str(sample_session)
    assert get_cached_session(path) == parse_session(path)


def test_cache_hit_avoids_reparse(sample_session: Path, monkeypatch: pytest.MonkeyPatch) -> None:
    path = str(sample_session)
    get_cached_session(path)
    calls = 0

    def counting_parse(p: str):
        nonlocal calls
        calls += 1
        return parse_session(p)

    monkeypatch.setattr("utils.session_cache.parse_session", counting_parse)
    get_cached_session(path)
    assert calls == 0


def test_cache_invalidates_on_mtime_change(
    sample_session: Path, monkeypatch: pytest.MonkeyPatch
) -> None:
    path = str(sample_session)
    get_cached_session(path)

    calls = 0

    def counting_parse(p: str):
        nonlocal calls
        calls += 1
        return parse_session(p)

    monkeypatch.setattr("utils.session_cache.parse_session", counting_parse)

    stat = sample_session.stat()
    os.utime(sample_session, (stat.st_mtime + 1, stat.st_mtime + 1))
    get_cached_session(path)
    assert calls == 1


def test_cache_normalizes_relative_and_absolute_paths(
    sample_session: Path,
    tmp_path: Path,
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    calls = 0

    def counting_parse(p: str):
        nonlocal calls
        calls += 1
        return parse_session(p)

    monkeypatch.setattr("utils.session_cache.parse_session", counting_parse)
    rel = "session.jsonl"
    abs_path = str(sample_session.resolve())
    original_cwd = os.getcwd()
    try:
        os.chdir(tmp_path)
        get_cached_session(rel)
        assert calls == 1
        get_cached_session(abs_path)
        assert calls == 1
    finally:
        os.chdir(original_cwd)


def test_lru_eviction(
    sample_session: Path, tmp_path: Path, monkeypatch: pytest.MonkeyPatch
) -> None:
    set_max_entries(2)
    content = sample_session.read_text(encoding="utf-8")
    paths = []
    for name in ("a.jsonl", "b.jsonl", "c.jsonl"):
        p = tmp_path / name
        p.write_text(content, encoding="utf-8")
        paths.append(p)

    for p in paths:
        get_cached_session(str(p))

    calls = 0

    def counting_parse(p: str):
        nonlocal calls
        calls += 1
        return parse_session(p)

    monkeypatch.setattr("utils.session_cache.parse_session", counting_parse)
    get_cached_session(str(paths[2]))
    assert calls == 0
    get_cached_session(str(paths[1]))
    assert calls == 0
    get_cached_session(str(paths[0]))
    assert calls == 1


def test_set_max_entries_rejects_negative() -> None:
    with pytest.raises(ValueError, match="non-negative"):
        set_max_entries(-1)


def test_returns_parsed_when_mtime_after_parse_raises(
    sample_session: Path, monkeypatch: pytest.MonkeyPatch
) -> None:
    path = str(sample_session)
    real_getmtime = os.path.getmtime
    calls = 0

    def getmtime_side_effect(p: str) -> float:
        nonlocal calls
        calls += 1
        if calls == 2:
            raise OSError("file removed after parse")
        return real_getmtime(p)

    monkeypatch.setattr(os.path, "getmtime", getmtime_side_effect)
    result = get_cached_session(path)
    assert result == parse_session(path)