Test symmath's dynamath functionality

[Carlos-Muniz]

symmath is used to check symbolic mathematics expression inputs against what an expected mathematical expression. It also has an extra variable called dynamath that is xml code that can be evaluated into a mathematical expression.

This functionality is not well tested, with only one test that even covers using the dynamath variable. There needs to be more tests to be sure that this functionality works as implemented. And in the probable case that dynamath doesn't work in its current implementation, it needs to be fixed.