diff --git a/tests/conftest.py b/tests/conftest.py
new file mode 100644
index 0000000..f4003d6
--- /dev/null
+++ b/tests/conftest.py
@@ -0,0 +1,80 @@
+"""Shared pytest setup and teardown for ExplorerPro.
+
+1. Safe Symlink & Numbered Dir Cleanup (Windows):
+   On Windows, pytest's `cleanup_dead_symlinks` in `_pytest.pathlib` checks
+   `left_dir.resolve().exists()` on `pytest-current` (a directory symlink).
+   Without Developer Mode or when symlink permissions differ, `exists()` raises
+   `PermissionError: [WinError 5] Zugriff verweigert: '...\\pytest-current'`.
+   When raised inside `tmp_path_factory._exit_stack.close()` at sessionfinish,
+   CPython aborts with `Fatal Python error: Aborted` / `STATUS_STACK_BUFFER_OVERRUN`
+   (exit code 1). Suppressing OSError in `cleanup_dead_symlinks` and `cleanup_numbered_dir`
+   guards against this Windows-specific teardown failure.
+
+2. Clean Qt Top-Level Widget Teardown:
+   Closes and schedules `deleteLater()` for remaining top-level Qt widgets
+   and processes pending events, preventing dangling QObject destructors
+   at interpreter exit.
+"""
+from __future__ import annotations
+
+import os
+
+os.environ.setdefault("QT_QPA_PLATFORM", "offscreen")
+
+try:
+    import _pytest.pathlib as _pytest_pathlib
+
+    _orig_cleanup_dead_symlinks = _pytest_pathlib.cleanup_dead_symlinks
+    _orig_cleanup_numbered_dir = _pytest_pathlib.cleanup_numbered_dir
+
+    def _safe_cleanup_dead_symlinks(root):
+        try:
+            _orig_cleanup_dead_symlinks(root)
+        except OSError:
+            pass
+
+    def _safe_cleanup_numbered_dir(root, prefix, keep, consider_lock_dead_if_created_before):
+        try:
+            _orig_cleanup_numbered_dir(root, prefix, keep, consider_lock_dead_if_created_before)
+        except OSError:
+            pass
+
+    _pytest_pathlib.cleanup_dead_symlinks = _safe_cleanup_dead_symlinks
+    _pytest_pathlib.cleanup_numbered_dir = _safe_cleanup_numbered_dir
+except (ImportError, AttributeError):
+    pass
+
+import pytest
+from PySide6.QtWidgets import QApplication
+
+
+@pytest.fixture(autouse=True)
+def _cleanup_qt_widgets():
+    """Ensure top-level Qt widgets created during a test are closed and drained."""
+    yield
+    app = QApplication.instance()
+    if app is not None:
+        for widget in app.topLevelWidgets():
+            try:
+                widget.close()
+                widget.deleteLater()
+            except Exception:
+                pass
+        app.processEvents()
+
+
+def pytest_sessionfinish(session, exitstatus):
+    """Drain any remaining events before interpreter shutdown."""
+    app = QApplication.instance()
+    if app is not None:
+        try:
+            for widget in app.topLevelWidgets():
+                try:
+                    widget.close()
+                    widget.deleteLater()
+                except Exception:
+                    pass
+            for _ in range(5):
+                app.processEvents()
+        except Exception:
+            pass
diff --git a/tests/test_checksum_dialog.py b/tests/test_checksum_dialog.py
index d9fdb8d..ffc1523 100644
--- a/tests/test_checksum_dialog.py
+++ b/tests/test_checksum_dialog.py
@@ -71,10 +71,13 @@ def test_checksum_dialog_non_existent_file(tmp_path: Path):
 
 def test_checksum_dialog_close_cancels_worker(tmp_path: Path):
     """Prüft, dass closeEvent den Worker sauber abbricht."""
-    _ensure_app()
+    app = _ensure_app()
     sample = tmp_path / "cancel_test.txt"
     sample.write_bytes(b"X" * (500 * 1024))
 
     dlg = ChecksumDialog(str(sample))
     dlg.closeEvent(QCloseEvent())
     assert dlg.worker is not None
+    dlg.close()
+    dlg.deleteLater()
+    app.processEvents()
diff --git a/tests/test_store_regressions_20260928.py b/tests/test_store_regressions_20260928.py
index a7fe322..fe02fe0 100644
--- a/tests/test_store_regressions_20260928.py
+++ b/tests/test_store_regressions_20260928.py
@@ -254,3 +254,48 @@ def test_frozen_run_button_starts_interpreter_not_explorerpro(tmp_path, monkeypa
     editor._run_code()
     assert launched == [(str(interpreter), [str(script)])]
     editor.close()
+
+
+def test_right_click_on_unselected_row_selects_row(tmp_path, monkeypatch):
+    _app()
+    first = tmp_path / "first.txt"
+    second = tmp_path / "second.txt"
+    first.write_text("first", encoding="utf-8")
+    second.write_text("second", encoding="utf-8")
+
+    browser = FileBrowser()
+    browser.resize(800, 500)
+    browser.show()
+    browser.navigate_to(str(tmp_path))
+    for _ in range(100):
+        _app().processEvents()
+        if browser.proxy.rowCount(browser.table.rootIndex()) == 2:
+            break
+        time.sleep(.01)
+
+    idx_first = browser.proxy.mapFromSource(browser.model.index(str(first)))
+    browser.table.selectRow(idx_first.row())
+    assert [Path(p) for p in browser.get_selected_files()] == [first]
+
+    idx_second = browser.proxy.mapFromSource(browser.model.index(str(second)))
+    assert not browser.table.selectionModel().isRowSelected(idx_second.row(), idx_second.parent())
+
+    menus = []
+
+    class CapturingMenu(QMenu):
+        def exec(self, *args):
+            menus.append(self)
+
+    monkeypatch.setattr(browser_module, "QMenu", CapturingMenu)
+    pos = browser.table.visualRect(idx_second).center()
+    event = QContextMenuEvent(
+        QContextMenuEvent.Reason.Mouse, pos, browser.table.viewport().mapToGlobal(pos)
+    )
+    QApplication.sendEvent(browser.table.viewport(), event)
+
+    assert browser.table.selectionModel().isRowSelected(idx_second.row(), idx_second.parent())
+    assert second in [Path(p) for p in browser.get_selected_files()]
+
+    browser.close()
+    browser.deleteLater()
+    _app().processEvents()