G-API: division test is disabled for MathOperatorTest

[ghost]

Testing of the divsion operation has been disabled by @alalek with PR #13096

I am filing this issue in order to track fixing and re-enabling of these tests

Reasoning provided by @alalek about these tests:

Div by exact zero has been changed in OpenCV 4.x (to follow IEEE 754 for floating point numbers): #12826

Div by values near zero provides unreliable results.
Small error in denominator provides has huge impact on result. So inputs should be "normalized" (avoided values near zero), or compare function should be based on input values too (it is not enough to provide "expected" and "actual" results only)

[dmatveev]

@elatkin is this issue still relevant? There was a PR merged

[ghost]

@elatkin is this issue still relevant? There was a PR merged

PR #13096 disables the opDiv and opDivR cases of the MathOperatorTestCPU

This issue intends to track fixing and restoring of those test cases

[dmatveev]

Ok, thanks!

[alalek]

Looks like tests were updated by #18257 (4.5.0)