add tests for dirmanager

tests/test_dir_manager.py

@@ -0,0 +1,30 @@
+
+import time
+import pytest
+from pytest_abra.dir_manager import DirManager
+from pathlib import Path
+
+def test_get_latest_session_id_from_non_existing_dir(tmp_path: Path):
+    out = DirManager.get_latest_session_id(tmp_path / "not_exist")
+    assert out is None
+
+def test_get_latest_session_id_from_empty_dir(tmp_path: Path):
+    out = DirManager.get_latest_session_id(tmp_path)
+    assert out is None
+
+def test_get_latest_session_id_single(tmp_path: Path):
+    (tmp_path / "a").mkdir()
+    out = DirManager.get_latest_session_id(tmp_path)
+    assert out == "a"
+
+    
+
+@pytest.mark.slow
+def test_get_latest_session_id(tmp_path: Path):
+    (tmp_path / "a").mkdir()
+    time.sleep(1.1)
+    (tmp_path / "b").mkdir()
+    out = DirManager.get_latest_session_id(tmp_path)
+    assert out == "b"
+
+