Thanks, @apavlenko.
I found two ``` EXPECT_MAT_NEAR ``` macros:
One in ``` ocl ``` https://github.com/Itseez/opencv/blob/fee2ed37fc27dbfd25f850f627b8121a308eb200/modules/ocl/test/utility.hpp#L94
Another in ``` gpu ```
https://github.com/Itseez/opencv/blob/96b008cd292a1969be7e7e661492661f3cadcfe0/modules/ts/include/opencv2/ts/gpu_test.hpp#L110

How can I include one of these to ``` imgproc ``` module?
Or, should I define a similar macro in somewhere else?