Port operator tests from R to googletest

[paleolimbot]

Accessors:

• [ ] s2_is_collection(): https://github.com/r-spatial/s2/blob/main/tests/testthat/test-s2-accessors.R#L2-L17
• [ ] s2_is_valid(): https://github.com/r-spatial/s2/blob/main/tests/testthat/test-s2-accessors.R#L19-L69
• [ ] s2_dimension(): https://github.com/r-spatial/s2/blob/main/tests/testthat/test-s2-accessors.R#L19-L69
• [ ] s2_num_points(): https://github.com/r-spatial/s2/blob/main/tests/testthat/test-s2-accessors.R#L78-L88
• [ ] s2_is_empty(): https://github.com/r-spatial/s2/blob/main/tests/testthat/test-s2-accessors.R#L90-L98
• [ ] s2_area(): https://github.com/r-spatial/s2/blob/main/tests/testthat/test-s2-accessors.R#L100-L116
• [ ] s2_length(): https://github.com/r-spatial/s2/blob/main/tests/testthat/test-s2-accessors.R#L118-L125
• [ ] s2_perimeter(): https://github.com/r-spatial/s2/blob/main/tests/testthat/test-s2-accessors.R#L127-L139
• [ ] s2_x() and s2_y(): https://github.com/r-spatial/s2/blob/main/tests/testthat/test-s2-accessors.R#L141-L152
• [ ] s2_project()/s2_project_normalized(): https://github.com/r-spatial/s2/blob/main/tests/testthat/test-s2-accessors.R#L154-L184
• [ ] s2_interpolate(): https://github.com/r-spatial/s2/blob/main/tests/testthat/test-s2-transformers.R#L630-L655
• [ ] s2_distance(): https://github.com/r-spatial/s2/blob/main/tests/testthat/test-s2-accessors.R#L186-L206
• [ ] s2_max_distance(): https://github.com/r-spatial/s2/blob/main/tests/testthat/test-s2-accessors.R#L208-L228

Bounds:

• [ ] s2_bounds_cap(): https://github.com/r-spatial/s2/blob/main/tests/testthat/test-s2-bounds.R#L2-L13
• [ ] s2_bounds_rect(): https://github.com/r-spatial/s2/blob/main/tests/testthat/test-s2-bounds.R#L15-L44

Transformers:

• [ ] s2_centroid(): https://github.com/r-spatial/s2/blob/main/tests/testthat/test-s2-transformers.R#L2-L33
• [ ] s2_point_on_surface(): https://github.com/r-spatial/s2/blob/main/tests/testthat/test-s2-transformers.R#L35-L47
• [ ] s2_boundary(): https://github.com/r-spatial/s2/blob/main/tests/testthat/test-s2-transformers.R#L49-L66
• [ ] s2_closest_point(): https://github.com/r-spatial/s2/blob/main/tests/testthat/test-s2-transformers.R#L68-L71
• [ ] s2_clearance_line_between(): https://github.com/r-spatial/s2/blob/main/tests/testthat/test-s2-transformers.R#L73-L89
• [ ] s2_difference(): https://github.com/r-spatial/s2/blob/main/tests/testthat/test-s2-transformers.R#L91-L130
• [ ] s2_sym_difference(): https://github.com/r-spatial/s2/blob/main/tests/testthat/test-s2-transformers.R#L132-L174
• [ ] s2_intersection(): https://github.com/r-spatial/s2/blob/main/tests/testthat/test-s2-transformers.R#L176-L243
• [ ] s2_union(): https://github.com/r-spatial/s2/blob/main/tests/testthat/test-s2-transformers.R#L245-L330
• [ ] Options for the builder: https://github.com/r-spatial/s2/blob/main/tests/testthat/test-s2-transformers.R#L332-L364
• [ ] s2_coverage_union_agg(): https://github.com/r-spatial/s2/blob/main/tests/testthat/test-s2-transformers.R#L366-L383
• [ ] s2_union_agg(): https://github.com/r-spatial/s2/blob/main/tests/testthat/test-s2-transformers.R#L385-L421
• [ ] s2_rebuild_agg(): https://github.com/r-spatial/s2/blob/main/tests/testthat/test-s2-transformers.R#L423-L440
• [ ] s2_centroid_agg(): https://github.com/r-spatial/s2/blob/main/tests/testthat/test-s2-transformers.R#L442-L456
• [ ] s2_rebuild(): https://github.com/r-spatial/s2/blob/main/tests/testthat/test-s2-transformers.R#L483-L602
• [ ] s2_convex_hull(): https://github.com/r-spatial/s2/blob/main/tests/testthat/test-s2-transformers.R#L657-L664
• [ ] s2_convex_hull_agg(): https://github.com/r-spatial/s2/blob/main/tests/testthat/test-s2-transformers.R#L667-L714

Predicates:

• [ ] s2_contains(): https://github.com/r-spatial/s2/blob/main/tests/testthat/test-s2-predicates.R#L2-L23
• [ ] s2_equals(): https://github.com/r-spatial/s2/blob/main/tests/testthat/test-s2-predicates.R#L68-L81
• [ ] s2_intersects(): https://github.com/r-spatial/s2/blob/main/tests/testthat/test-s2-predicates.R#L83-L101
• [ ] s2_intersects_box(): https://github.com/r-spatial/s2/blob/main/tests/testthat/test-s2-predicates.R#L103-L124
• [ ] s2_dwithin(): https://github.com/r-spatial/s2/blob/main/tests/testthat/test-s2-predicates.R#L149-L182

[benbovy]

I'm happy to help on this! I might have some time in the two forthcoming months.

[paleolimbot]

Awesome! I haven't had time to make any progress but I had planned to do a few here and there over the summer as time allows.