diff --git a/DataAnnotation/labelme/tests/labelme_tests/test_app.py b/DataAnnotation/labelme/tests/labelme_tests/test_app.py
new file mode 100644
index 0000000000000000000000000000000000000000..018ab88c2ea47248cb6443bfa02280478199c04e
--- /dev/null
+++ b/DataAnnotation/labelme/tests/labelme_tests/test_app.py
@@ -0,0 +1,64 @@
+import os.path as osp
+import shutil
+import tempfile
+
+import labelme.app
+import labelme.config
+import labelme.testing
+
+
+here = osp.dirname(osp.abspath(__file__))
+data_dir = osp.join(here, 'data')
+
+
+def test_MainWindow_open(qtbot):
+    win = labelme.app.MainWindow()
+    qtbot.addWidget(win)
+    win.show()
+    win.close()
+
+
+def test_MainWindow_open_json(qtbot):
+    filename = osp.join(data_dir, 'apc2016_obj3.json')
+    labelme.testing.assert_labelfile_sanity(filename)
+    win = labelme.app.MainWindow(filename=filename)
+    qtbot.addWidget(win)
+    win.show()
+    win.close()
+
+
+def test_MainWindow_annotate_jpg(qtbot):
+    tmp_dir = tempfile.mkdtemp()
+    filename = osp.join(tmp_dir, 'apc2016_obj3.jpg')
+    shutil.copy(osp.join(data_dir, 'apc2016_obj3.jpg'),
+                filename)
+    output_file = osp.join(tmp_dir, 'apc2016_obj3.json')
+
+    config = labelme.config.get_default_config()
+    win = labelme.app.MainWindow(
+        config=config,
+        filename=filename,
+        output_file=output_file,
+    )
+    qtbot.addWidget(win)
+    win.show()
+
+    def check_imageData():
+        assert hasattr(win, 'imageData')
+        assert win.imageData is not None
+
+    qtbot.waitUntil(check_imageData)  # wait for loadFile
+
+    label = 'shelf'
+    points = [
+        (26, 70),
+        (176, 730),
+        (986, 742),
+        (1184, 102),
+    ]
+    shape = label, points, None, None, 'polygon', {}
+    shapes = [shape]
+    win.loadLabels(shapes)
+    win.saveFile()
+
+    labelme.testing.assert_labelfile_sanity(output_file)