add tests to make sure indexed datasets are ready to use

[Yujie-W]

Library issues

[codecov[bot]]

Codecov Report

Merging #76 (f193418) into main (5afd448) will increase coverage by 0.26%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #76      +/-   ##
==========================================
+ Coverage   62.89%   63.15%   +0.26%     
==========================================
  Files           6        6              
  Lines         380      380              
==========================================
+ Hits          239      240       +1     
+ Misses        141      140       -1     

Impacted Files	Coverage Δ
src/Collector.jl	93.65% <100.00%> (+0.79%)	:arrow_up:

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[Yujie-W]

bors r+

[bors[bot]]

Build succeeded:

• docs-build
• macos-latest
• ubuntu-latest
• version-test
• windows-latest