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How many tests are supposed to be passed?

Downloaded and compiled OpenCV 3.0 gold with VS2013 without any problem. The new build created all necessary dlls and also _perf_.exe and _test_.exe files for testing. Regarding this, I have a couple of questions.

How can I run all perf_.exe and test_.exe? I couldn't find any way to do this so I simply made a batch file to run every test files and put their results into a text file. I wonder if this is a right way.
Looking at test results from _test_.exe files, most of tests passed but there are some (sometimes hundreds) tests failed. Is this normal? Considering these tests are unit tests, I think they should all pass. Does this mean my build has a problem?

How many tests are supposed to be passed?

How can I run all perf_.exe and test_.exe? I couldn't find any way to do this so I simply made a batch file to run every test files and put their results into a text file. I wonder if this is a right way.
Looking at test results from _test_.exe files, most of tests passed but there are some (sometimes hundreds) tests failed. Is this normal? Considering these tests are unit tests, I think they should all pass. Does this mean my build has a problem?

UPDATE: As berak recommended, I've downloaded necessary files and set the system variable OPENCV_TEST_DATA_PATH, but still get many errors like following in opencv_test_core.exe. So question #2 still stands.

[ RUN ] OCL_Arithm/Pow.Mat/0 unknown file: error: SEH exception with code 0xc0000005 thrown in the test body.

[ FAILED ] OCL_Arithm/Pow.Mat/0, where GetParam() = (CV_32F, Channels(1), fals e) (131 ms)