adding python smoke test for MSDDetector

modules/xfeatures2d/include/opencv2/xfeatures2d.hpp

@@ -282,7 +282,7 @@ class CV_EXPORTS_W MSDDetector : public Feature2D {
 
 public:
 
-    static Ptr<MSDDetector> create(int m_patch_radius = 3, int m_search_area_radius = 5,
+   CV_WRAP static Ptr<MSDDetector> create(int m_patch_radius = 3, int m_search_area_radius = 5,
             int m_nms_radius = 5, int m_nms_scale_radius = 0, float m_th_saliency = 250.0f, int m_kNN = 4,
             float m_scale_factor = 1.25f, int m_n_scales = -1, bool m_compute_orientation = false);
 };

modules/xfeatures2d/misc/python/test/test_descriptors.py

@@ -0,0 +1,24 @@
+#!/usr/bin/env python
+
+# Python 2/3 compatibility
+from __future__ import print_function
+
+import os
+import numpy as np
+import cv2 as cv
+
+from tests_common import NewOpenCVTests
+
+class MSDDetector_test(NewOpenCVTests):
+
+    def test_create(self):
+
+        msd = cv.xfeatures2d.MSDDetector_create()
+        self.assertFalse(msd is None)
+
+        img1 = np.zeros((100, 100, 3), dtype=np.uint8)
+        kp1_, des1_ = msd.detectAndCompute(img1, None)
+
+
+if __name__ == '__main__':
+    NewOpenCVTests.bootstrap()