[FEA]: Create Test Utility for Geometry Generators

[isVoid]

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Is this a new feature, an improvement, or a change to existing functionality?

Improvement

How would you describe the priority of this feature request

Medium

Please provide a clear description of problem you would like to solve.

geometry_generator.cuh now contains 3 types of generator: multipolygon_generator, multilinestring_generator and multipoint_generator. However only the multipolygon one is tested. The rest should also have a test for it.

Describe any alternatives you have considered

No response

Additional context

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