nydus-image: add unit test for setting default compression algorithm

[xwb1136021767]

Relevant Issue (if applicable)

Add unit test for da501f7.

Details

Please describe the details of PullRequest.

Types of changes

What types of changes does your PullRequest introduce? Put an x in all the boxes that apply:

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation Update (if none of the other choices apply)

Checklist

Go over all the following points, and put an x in all the boxes that apply.

• I have updated the documentation accordingly.
• I have added tests to cover my changes.

[anolis-bot]

@xwb1136021767 , a new test job has been submitted. Please wait in patience. The test job url: https://tone.openanolis.cn/ws/nrh4nnio/test_result/83209

[codecov]

Codecov Report

Merging #1354 (94db6de) into master (98834dd) will increase coverage by 0.14%.
The diff coverage is 94.44%.

@@            Coverage Diff             @@
##           master    #1354      +/-   ##
==========================================
+ Coverage   45.80%   45.94%   +0.14%     
==========================================
  Files         122      122              
  Lines       37733    37766      +33     
  Branches    37733    37766      +33     
==========================================
+ Hits        17284    17353      +69     
+ Misses      19538    19501      -37     
- Partials      911      912       +1     

Impacted Files	Coverage Δ
builder/src/core/blob.rs	25.29% <94.44%> (+11.66%)	⬆️

... and 3 files with indirect coverage changes

[anolis-bot]

@xwb1136021767 , The CI test is completed, please check result:

Test Case		Test Result
build rust golang image		✅ SUCCESS
compile nydusd		✅ SUCCESS
compile ctr remote		✅ SUCCESS
compile nydus snapshotter		✅ SUCCESS
run container with rafs		✅ SUCCESS
run container with zran		✅ SUCCESS
run container with rafs and compile linux		✅ SUCCESS

Congratulations, your test job passed!