neighbor_sample C++ tests

[rusty1s]

No description provided.

[codecov-commenter]

Codecov Report

Merging #80 (d53ed19) into master (0383af5) will increase coverage by 7.82%.
The diff coverage is n/a.

❗ Current head d53ed19 differs from pull request most recent head 3f50bd8. Consider uploading reports for the commit 3f50bd8 to get more accurate results

@@            Coverage Diff             @@
##           master      #80      +/-   ##
==========================================
+ Coverage   79.25%   87.07%   +7.82%     
==========================================
  Files          14       14              
  Lines         294      294              
==========================================
+ Hits          233      256      +23     
+ Misses         61       38      -23     

Impacted Files	Coverage Δ
pyg_lib/csrc/sampler/cpu/neighbor_kernel.cpp	57.69% <0.00%> (+46.15%)	⬆️
pyg_lib/csrc/sampler/neighbor.cpp	100.00% <0.00%> (+78.57%)	⬆️

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more