diff --git a/beeref/__main__.py b/beeref/__main__.py
index 8f4908a..eae1a50 100755
--- a/beeref/__main__.py
+++ b/beeref/__main__.py
@@ -30,7 +30,7 @@ logger = logging.getLogger('BeeRef')
 
 class BeeRefMainWindow(QtWidgets.QWidget):
 
-    def __init__(self, app, filename=None):
+    def __init__(self, app):
         super().__init__()
         self.setWindowTitle('BeeRef')
         self.setWindowIcon(BeeAssets().logo)
@@ -38,9 +38,9 @@ class BeeRefMainWindow(QtWidgets.QWidget):
         layout.setContentsMargins(QtCore.QMargins(0, 0, 0, 0))
         self.setLayout(layout)
         self.resize(500, 300)
-        self.show()
         self.view = BeeGraphicsView(app, self)
         layout.addWidget(self.view)
+        self.show()
 
     def __del__(self):
         del self.view
@@ -81,4 +81,4 @@ def main():
 
 
 if __name__ == '__main__':
-    main()
+    main()  # pragma: no cover
diff --git a/tests/test_main.py b/tests/test_main.py
new file mode 100644
index 0000000..233fdca
--- /dev/null
+++ b/tests/test_main.py
@@ -0,0 +1,32 @@
+from unittest.mock import patch
+
+from PyQt6 import QtCore
+
+from beeref.__main__ import BeeRefMainWindow, main
+from beeref.assets import BeeAssets
+from beeref.view import BeeGraphicsView
+
+from .base import BeeTestCase
+
+
+class BeeRefMainWindowTestCase(BeeTestCase):
+
+    @patch('PyQt6.QtWidgets.QWidget.show')
+    def test_init(self, show_mock):
+        window = BeeRefMainWindow(self.app)
+        assert window.windowTitle() == 'BeeRef'
+        assert BeeAssets().logo == BeeAssets().logo
+        assert window.windowIcon()
+        assert window.contentsMargins() == QtCore.QMargins(0, 0, 0, 0)
+        assert isinstance(window.view, BeeGraphicsView)
+        show_mock.assert_called_once()
+
+
+class BeeRefMainTestCase(BeeTestCase):
+
+    @patch('PyQt6.QtWidgets.QApplication')
+    def test_run(self, app_mock):
+        app_mock.return_value = self.app
+        with patch.object(self.app, 'exec') as exec_mock:
+            main()
+            exec_mock.assert_called_once_with()
diff --git a/tests/test_selection.py b/tests/test_selection.py
index f0b12b9..7389e9e 100644
--- a/tests/test_selection.py
+++ b/tests/test_selection.py
@@ -206,6 +206,26 @@ class SelectableMixinTestCase(SelectableMixinBaseTestCase):
         self.item.SELECT_ROTATE_SIZE = 100
         assert self.item.select_rotate_size == 25
 
+    def test_draw_debug_shape_rect(self):
+        painter = MagicMock()
+        self.item.draw_debug_shape(
+            painter,
+            QtCore.QRectF(5, 6, 20, 30),
+            255, 0, 0)
+        painter.fillRect.assert_called_once()
+        painter.fillPath.assert_not_called()
+
+    def test_draw_debug_shape_path(self):
+        painter = MagicMock()
+        path = QtGui.QPainterPath()
+        path.addRect(QtCore.QRectF(5, 6, 20, 30))
+        self.item.draw_debug_shape(
+            painter,
+            path,
+            0, 255, 0)
+        painter.fillPath.assert_called_once()
+        painter.fillRect.assert_not_called()
+
     @patch('beeref.items.BeePixmapItem.draw_debug_shape')
     def test_paint_when_not_selected(self, debug_mock):
         painter = MagicMock()