Added test for concatenation with empty matrices.

modules/core/test/test_concatenation.cpp

@@ -0,0 +1,147 @@
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+
+#include "test_precomp.hpp"
+
+using namespace cv;
+using namespace std;
+
+class Core_ConcatenationTest : public cvtest::BaseTest
+{
+public:
+    Core_ConcatenationTest(bool horizontal, bool firstEmpty, bool secondEmpty);
+protected:
+    int prepare_test_case( int );
+    void run_func();
+    int validate_test_results( int );
+
+    Mat mat0x5;
+    Mat mat10x5;
+    Mat mat20x5;
+
+    Mat mat5x0;
+    Mat mat5x10;
+    Mat mat5x20;
+
+    Mat result;
+
+    bool horizontal;
+    bool firstEmpty;
+    bool secondEmpty;
+
+private:
+    static bool areEqual(const Mat& m1, const Mat& m2);
+
+};
+
+Core_ConcatenationTest::Core_ConcatenationTest(bool horizontal, bool firstEmpty, bool secondEmpty)
+    : horizontal(horizontal)
+    , firstEmpty(firstEmpty)
+    , secondEmpty(secondEmpty)
+{
+    test_case_count = 1;
+
+    mat0x5 = Mat::ones(0,5, CV_8U);
+    mat10x5 = Mat::ones(10,5, CV_8U);
+    mat20x5 = Mat::ones(20,5, CV_8U);
+
+    mat5x0 = Mat::ones(5,0, CV_8U);
+    mat5x10 = Mat::ones(5,10, CV_8U);
+    mat5x20 = Mat::ones(5,20, CV_8U);
+}
+
+int Core_ConcatenationTest::prepare_test_case( int test_case_idx )
+{
+    cvtest::BaseTest::prepare_test_case( test_case_idx );
+    return 1;
+}
+
+void Core_ConcatenationTest::run_func()
+{
+    if (horizontal)
+    {
+        cv::hconcat((firstEmpty ? mat5x0 : mat5x10),
+                    (secondEmpty ? mat5x0 : mat5x10),
+                    result);
+    } else {
+        cv::vconcat((firstEmpty ? mat0x5 : mat10x5),
+                    (secondEmpty ? mat0x5 : mat10x5),
+                    result);
+    }
+}
+
+int Core_ConcatenationTest::validate_test_results( int )
+{
+    Mat expected;
+
+    if (firstEmpty && secondEmpty)
+        expected = (horizontal ? mat5x0 : mat0x5);
+    else if ((firstEmpty && !secondEmpty) || (!firstEmpty && secondEmpty))
+        expected = (horizontal ? mat5x10 : mat10x5);
+    else
+        expected = (horizontal ? mat5x10 : mat10x5);
+
+    if (areEqual(expected, result))
+    {
+        return cvtest::TS::OK;
+    } else
+    {
+        ts->printf( cvtest::TS::LOG, "Concatenation failed");
+        ts->set_failed_test_info( cvtest::TS::FAIL_MISMATCH );
+    }
+
+    return cvtest::TS::OK;
+}
+
+bool Core_ConcatenationTest::areEqual(const Mat &m1, const Mat &m2)
+{
+    return m1.size() == m2.size()
+            && m1.type() == m2.type()
+            && countNonZero(m1 != m2) == 0;
+}
+
+TEST(Core_Concatenation, hconcat_empty_nonempty) { Core_ConcatenationTest test(true, true, false); test.safe_run(); }
+TEST(Core_Concatenation, hconcat_nonempty_empty) { Core_ConcatenationTest test(true, false, true); test.safe_run(); }
+TEST(Core_Concatenation, hconcat_empty_empty) { Core_ConcatenationTest test(true, true, true); test.safe_run(); }
+
+TEST(Core_Concatenation, vconcat_empty_nonempty) { Core_ConcatenationTest test(false, true, false); test.safe_run(); }
+TEST(Core_Concatenation, vconcat_nonempty_empty) { Core_ConcatenationTest test(false, false, true); test.safe_run(); }
+TEST(Core_Concatenation, vconcat_empty_empty) { Core_ConcatenationTest test(false, true, true); test.safe_run(); }