Parameterize Unit Tests

[rchen20]

Some of the unit tests are potentially parametrizable. In particular, we can cut down the .cpp source files by generating them in CMake. Here is a list of directories to slim down by applying some of our more advanced infrastructure (in raja/tests/unit/):

• [ ] atomic
• [ ] hip
• [ ] index
• [ ] internal
• [ ] reducer
• [ ] util/operator
• [ ] util
• [ ] view-layout