add dnn data search

Author: AleksandrPanov

modules/wechat_qrcode/test/test_main.cpp

@@ -11,4 +11,19 @@
 #include <hpx/hpx_main.hpp>
 #endif
 
-CV_TEST_MAIN("cv")
+static
+void initTests()
+{
+#ifdef HAVE_OPENCV_DNN
+    const char* extraTestDataPath =
+#ifdef WINRT
+        NULL;
+#else
+        getenv("OPENCV_DNN_TEST_DATA_PATH");
+#endif
+    if (extraTestDataPath)
+        cvtest::addDataSearchPath(extraTestDataPath);
+#endif  // HAVE_OPENCV_DNN
+}
+
+CV_TEST_MAIN("cv", initTests())