updated tests and test data

modules/ximgproc/test/test_main.cpp

 #include "test_precomp.hpp"
 
-CV_TEST_MAIN("ximpgroc")
+CV_TEST_MAIN("")

modules/ximgproc/test/test_structured_edge_detection.cpp

@@ -5,10 +5,11 @@ namespace cvtest
 
 TEST(ximpgroc_StructuredEdgeDetection, regression)
 {
-    cv::String dir = cvtest::TS::ptr()->get_data_path();
+    cv::String subfolder = "cv/ximgproc/";
+    cv::String dir = cvtest::TS::ptr()->get_data_path() + subfolder;
     int nTests = 12;
     float threshold = 0.01f;
-
+    
     cv::String modelName = dir + "model.yml.gz";
     cv::Ptr<cv::ximgproc::StructuredEdgeDetection> pDollar =
         cv::ximgproc::createStructuredEdgeDetection(modelName);
@@ -17,6 +18,7 @@ TEST(ximpgroc_StructuredEdgeDetection, regression)
     {
         cv::String srcName = dir + cv::format( "sources/%02d.png", i + 1);
         cv::Mat src = cv::imread( srcName, 1 );
+        ASSERT_TRUE(!src.empty());
 
         cv::String previousResultName = dir + cv::format( "results/%02d.png", i + 1 );
         cv::Mat previousResult = cv::imread( previousResultName, 0 );

modules/xphoto/test/dct_image_denoising.cpp

@@ -7,7 +7,7 @@ namespace cvtest
         cv::String dir = cvtest::TS::ptr()->get_data_path() + "dct_image_denoising/";
         int nTests = 1;
 
-        double thresholds[] = {0.1};
+        double thresholds[] = {0.2};
 
         int psize[] = {8};
         double sigma[] = {9.0};
@@ -16,11 +16,13 @@ namespace cvtest
         {
             cv::String srcName = dir + cv::format( "sources/%02d.png", i + 1);
             cv::Mat src = cv::imread( srcName, 1 );
+            ASSERT_TRUE(!src.empty());
 
             cv::String previousResultName = dir + cv::format( "results/%02d.png", i + 1 );
             cv::Mat previousResult = cv::imread( previousResultName, 1 );
+            ASSERT_TRUE(!src.empty());
 
-            cv::Mat currentResult, fastNlMeansResult;
+            cv::Mat currentResult;
 
             cv::dctDenoising(src, currentResult, sigma[i], psize[i]);
 

modules/xphoto/test/simple_color_balance.cpp

@@ -12,6 +12,7 @@ namespace cvtest
         {
             cv::String srcName = dir + cv::format( "sources/%02d.png", i + 1);
             cv::Mat src = cv::imread( srcName, 1 );
+            ASSERT_TRUE(!src.empty());
 
             cv::String previousResultName = dir + cv::format( "results/%02d.png", i + 1 );
             cv::Mat previousResult = cv::imread( previousResultName, 1 );