Added default to second argument of expectException() so that it can be called with a single argument (the expected exception type). Should also fix failures in the tests which call the function with a single argument.
Added default to second argument of expectException() so that it can be called with a single argument (the expected exception type). Should also fix failures in the tests which call the function with a single argument.

mxunit/mxunit,dfair98/mxunit,mxunit/mxunit,mikesprague/mxunit,dfair98/mxunit,mikesprague/mxunit,virtix/mxunit