Why can't we afford to properly test the potential monster breakthrough of EMdrive or other possible breakthroughs?

Here is the 712 page breakdown of NASA $18 billion 2017 budget which provides only a few million for Advanced concepts and innovation projects and has not budgeted a launch of an EMDrive to Space Station.

Although NASA conducts a much more visible space program, DOD's space program is larger. There is no easy way to track national security space funding since "space" is not a specific item in DOD's budget. A portion of these activities are classified ("black") programs for which budgetary information is not available on an unclassified basis. The rest of the funding is for unclassified ("white") programs, but is spread throughout the DOD budget in research and development, operations and management, and procurement accounts for the three services and defense-wide activities. The majority of funding is in the Air Force accounts, but is difficult to identify except for major programs. According to the fiscal year (FY) 2011 edition of the annual Aeronautics and Space Report of the President (the most recent available), DOD's FY2011 space budget was $27.3 billion, which is thought to represent all spending (classified and unclassified) for national security space activities