[runtime] Add more tests for wasm runtime

[yunwei37]

No description provided.

[codecov]

Codecov Report

Merging #68 (3ea082e) into main (31ee9c4) will increase coverage by 5.26%.
The diff coverage is 100.00%.

❗ Current head 3ea082e differs from pull request most recent head 7241aaf. Consider uploading reports for the commit 7241aaf to get more accurate results

@@            Coverage Diff             @@
##             main      #68      +/-   ##
==========================================
+ Coverage   72.72%   77.98%   +5.26%     
==========================================
  Files          10       10              
  Lines         924      954      +30     
==========================================
+ Hits          672      744      +72     
+ Misses        252      210      -42     

Impacted Files	Coverage Δ
runtime/wasm-bpf-rs/src/lib.rs	99.25% <100.00%> (+22.11%)	⬆️

... and 3 files with indirect coverage changes

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