ts: refactor OpenCV tests

- removed tr1 usage (dropped in C++17)
- moved includes of vector/map/iostream/limits into ts.hpp
- require opencv_test + anonymous namespace (added compile check)
- fixed norm() usage (must be from cvtest::norm for checks) and other conflict functions
- added missing license headers

modules/ml/test/test_save_load.cpp

@@ -41,11 +41,7 @@
 
 #include "test_precomp.hpp"
 
-#include <iostream>
-#include <fstream>
-
-using namespace cv;
-using namespace std;
+namespace opencv_test {
 
 CV_SLMLTest::CV_SLMLTest( const char* _modelName ) : CV_MLBaseTest( _modelName )
 {
@@ -148,6 +144,8 @@ int CV_SLMLTest::validate_test_results( int testCaseIdx )
     return code;
 }
 
+namespace {
+
 TEST(ML_NaiveBayes, save_load) { CV_SLMLTest test( CV_NBAYES ); test.safe_run(); }
 TEST(ML_KNearest, save_load) { CV_SLMLTest test( CV_KNEAREST ); test.safe_run(); }
 TEST(ML_SVM, save_load) { CV_SLMLTest test( CV_SVM ); test.safe_run(); }
@@ -295,10 +293,11 @@ TEST(DISABLED_ML_SVM, linear_save_load)
     svm3->predict(samples, r3);
 
     double eps = 1e-4;
-    EXPECT_LE(norm(r1, r2, NORM_INF), eps);
-    EXPECT_LE(norm(r1, r3, NORM_INF), eps);
+    EXPECT_LE(cvtest::norm(r1, r2, NORM_INF), eps);
+    EXPECT_LE(cvtest::norm(r1, r3, NORM_INF), eps);
 
     remove(tname.c_str());
 }
 
+}} // namespace
 /* End of file. */