connectedcomponents test case

diff --git a/modules/imgproc/test/test_connectedcomponents.cpp b/modules/imgproc/test/test_connectedcomponents.cpp
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+++ b/modules/imgproc/test/test_connectedcomponents.cpp
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+/*M///////////////////////////////////////////////////////////////////////////////////////
+//
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+//  If you do not agree to this license, do not download, install,
+//  copy or use the software.
+//
+//
+//                           License Agreement
+//                For Open Source Computer Vision Library
+//
+// Copyright (C) 2000-2008, Intel Corporation, all rights reserved.
+// Copyright (C) 2009, Willow Garage Inc., all rights reserved.
+// Third party copyrights are property of their respective owners.
+//
+// Redistribution and use in source and binary forms, with or without modification,
+// are permitted provided that the following conditions are met:
+//
+//   * Redistribution's of source code must retain the above copyright notice,
+//     this list of conditions and the following disclaimer.
+//
+//   * Redistribution's in binary form must reproduce the above copyright notice,
+//     this list of conditions and the following disclaimer in the documentation
+//     and/or other materials provided with the distribution.
+//
+//   * The name of the copyright holders may not be used to endorse or promote products
+//     derived from this software without specific prior written permission.
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+// This software is provided by the copyright holders and contributors "as is" and
+// any express or implied warranties, including, but not limited to, the implied
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+// In no event shall the Intel Corporation or contributors be liable for any direct,
+// indirect, incidental, special, exemplary, or consequential damages
+// (including, but not limited to, procurement of substitute goods or services;
+// loss of use, data, or profits; or business interruption) however caused
+// and on any theory of liability, whether in contract, strict liability,
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+//
+//M*/
+
+#include "test_precomp.hpp"
+#include <string>
+
+using namespace cv;
+using namespace std;
+
+class CV_ConnectedComponentsTest : public cvtest::BaseTest
+{
+public:
+    CV_ConnectedComponentsTest();
+    ~CV_ConnectedComponentsTest();
+protected:
+    void run(int);
+};
+
+CV_ConnectedComponentsTest::CV_ConnectedComponentsTest() {}
+CV_ConnectedComponentsTest::~CV_ConnectedComponentsTest() {}
+
+void CV_ConnectedComponentsTest::run( int /* start_from */)
+{
+    string exp_path = string(ts->get_data_path()) + "connectedcomponents/ccomp_exp.png";
+    Mat exp = imread(exp_path, 0);
+    Mat orig = imread(string(ts->get_data_path()) + "connectedcomponents/concentric_circles.png", 0);
+
+    if (orig.empty())
+    {
+        ts->set_failed_test_info( cvtest::TS::FAIL_INVALID_TEST_DATA );
+        return;
+    }
+
+    Mat bw = orig > 128;
+    Mat labelImage;
+    int nLabels = connectedComponents(bw, labelImage, 8, CV_32S);
+
+    for(int r = 0; r < labelImage.rows; ++r){
+        for(int c = 0; c < labelImage.cols; ++c){
+            int l = labelImage.at<int>(r, c);
+            bool pass = l >= 0 && l <= nLabels;
+            if(!pass){
+                ts->set_failed_test_info( cvtest::TS::FAIL_INVALID_OUTPUT );
+                return;
+            }
+        }
+    }
+
+    if( exp.empty() || orig.size() != exp.size() )
+    {
+        imwrite(exp_path, labelImage);
+        exp = labelImage;
+    }
+
+    if (0 != norm(labelImage > 0, exp > 0, NORM_INF))
+    {
+        ts->set_failed_test_info( cvtest::TS::FAIL_MISMATCH );
+        return;
+    }
+    if (nLabels != norm(labelImage, NORM_INF)+1)
+    {
+        ts->set_failed_test_info( cvtest::TS::FAIL_MISMATCH );
+        return;
+    }
+    ts->set_failed_test_info(cvtest::TS::OK);
+}
+
+TEST(Imgproc_ConnectedComponents, regression) { CV_ConnectedComponentsTest test; test.safe_run(); }
+