This function compares two value by a test_returnValue_... function
that fits the class of the reference input parameter.
test_returnValue_any(result, reference, xmlTestSpec)(any) Any value of type character, numeric, data.frame or list
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(any) Any value of type character, numeric, data.frame or list
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(XMLNode) An XMLNode of type RTest_test_returnValue_...
The function will not return anything but call testthat functions
creating outputs in the reporter