Jasper unit-tests and removed a superfluous assertion.

3rdparty/libjasper/jas_cm.c

@@ -842,7 +842,6 @@ static int jas_cmshapmat_apply(jas_cmpxform_t *pxform, jas_cmreal_t *in,
                 *dst++ = a2;
             }
         } else {
-assert(0);
             while (--cnt >= 0) {
                 a0 = *src++;
                 src++;

modules/imgcodecs/test/test_grfmt.cpp

@@ -87,6 +87,9 @@ TEST(Imgcodecs_imread, regression)
 {
     const char* const filenames[] =
     {
+#ifdef HAVE_JASPER
+        "Rome.jp2",
+#endif
         "color_palette_alpha.png",
         "multipage.tif",
         "rle.hdr",
@@ -109,6 +112,16 @@ TEST(Imgcodecs_imread, regression)
     }
 }
 
+#ifdef HAVE_JASPER
+TEST(Imgcodecs_jasper, regression)
+{
+    const string folder = string(cvtest::TS::ptr()->get_data_path()) + "/readwrite/";
+
+    ASSERT_TRUE(imread_compare(folder + "Bretagne2.jp2", IMREAD_UNCHANGED));
+    ASSERT_TRUE(imread_compare(folder + "Bretagne2.jp2", IMREAD_GRAYSCALE));
+}
+#endif
+
 class CV_GrfmtWriteBigImageTest : public cvtest::BaseTest
 {
 public: