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"stk_classic::mesh::Selector Unit Testing"

Selector unit testing environment.
A special set of mesh parts and entities are set up in the following configuration for the Selector unit testing.
Parts: PartA, PartB, PartC, PartD, PartU
PartU = MetaData.universal_part()
Entities: Entity1, Entity2, Entity3, Entity4, Entity5

PartA contains Entity1, Entity2
PartB contains Entity2, Entity3
PartC contains Entity3, Entity4
PartD contains no entities
Entity5 is not contained in any Part

|----------|--|-------|--|----------|    |-------------|
|<--PartA---->|       |<--PartC---->|    |   PartD     |
|          |<---PartB--->|          |    |             |
|  1       |2 |       |3 |       4  | 5  |             |
|          |  |       |  |          |    |             |
|          |  |       |  |          |    |             |
|----------|--|-------|--|----------|    |-------------|

Note: The unit test names use the convention of "i" for intersection, "u" for union, and "c" for complement.