Attach to existing tmux Claude session

tests/test_pty_manager.py

@@ -1,22 +1,84 @@
 """PtyManager 테스트."""
 
+from __future__ import annotations
+
+from collections.abc import Sequence
+
 import pytest
 
 from lazy_enter.pty_manager import PtyManager
 
 
+class FakeSpawn:
+    def __init__(self, *_args: object, **_kwargs: object) -> None:
+        self.before = ""
+        self._alive = True
+
+    def isalive(self) -> bool:
+        return self._alive
+
+    def sendline(self, _text: str) -> None:
+        return None
+
+    def expect(self, *_args: object, **_kwargs: object) -> None:
+        return None
+
+    def close(self, force: bool = False) -> None:
+        assert force is True
+        self._alive = False
+
+
 def test_initial_state():
-    pty = PtyManager("echo hello")
+    pty = PtyManager("claude")
     assert not pty.is_alive
 
 
-def test_start_and_stop():
-    pty = PtyManager("cat")
-    try:
-        pty.start()
-    except OSError as exc:
-        pytest.skip(f"PTY unavailable in this environment: {exc}")
+def test_start_raises_when_tmux_session_missing(monkeypatch: pytest.MonkeyPatch):
+    def fake_run(
+        cmd: Sequence[str],
+        check: bool,
+        capture_output: bool,
+        text: bool,
+    ):
+        assert list(cmd) == ["tmux", "has-session", "-t", "claude"]
+        assert check is False
+        assert capture_output is True
+        assert text is True
 
+        class Result:
+            returncode = 1
+
+        return Result()
+
+    monkeypatch.setattr("lazy_enter.pty_manager.subprocess.run", fake_run)
+
+    pty = PtyManager("claude")
+    with pytest.raises(RuntimeError):
+        pty.start()
+
+
+def test_start_and_stop_attach(monkeypatch: pytest.MonkeyPatch):
+    def fake_run(
+        _cmd: Sequence[str],
+        check: bool,
+        capture_output: bool,
+        text: bool,
+    ):
+        assert check is False
+        assert capture_output is True
+        assert text is True
+
+        class Result:
+            returncode = 0
+
+        return Result()
+
+    monkeypatch.setattr("lazy_enter.pty_manager.subprocess.run", fake_run)
+    monkeypatch.setattr("lazy_enter.pty_manager.pexpect.spawn", FakeSpawn)
+
+    pty = PtyManager("claude")
+    pty.start()
     assert pty.is_alive
+
     pty.stop()
     assert not pty.is_alive