Interpreter Evaluation Tests could fail if VS2013 is installed

[mkommend]

Currently the interpreter evaluation tests check if a tree that consists of log(-3) evaluates to double.NaN. With VS2012 Assert.AreEqual(double.NaN, double.NaN, epsilon) is true, while with VS2013 installed this evaluates to false and the assert is violated. Therefore, the unit tests should be adapted to explicitly check if both provided values are double.NaN and only otherwise evaluate the asserts.

For more information see: ​http://stackoverflow.com/questions/2524462/double-nan-equality-in-ms-test

[mkommend]

r11430: Adapted interpreter evaluation test to explicitly check if both values (interpreted and expected) are double.NaN.

[gkronber]

Reviewed r11430.

[mkommend]

r11534: Merged r11430 into stable.