tests(nano): test custom import

[glevco]

Motivation

Tie tests together, changing the mutability test to use our custom import, and making sure our custom import is used by blueprints. By doing this, we can provide a solution to the mutability of objects in our custom import, and the tests will reflect that.

Acceptance Criteria

• Add new BlueprintTestCase.register_blueprint_contents method.
• Add new test to make sure our custom import is being called.
• Change test_exposed_properties to use our custom import instead of the builtin.

Checklist

• If you are requesting a merge into master, confirm this code is production-ready and can be included in future releases as soon as it gets merged

[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 85.67%. Comparing base (3884064) to head (332e9b0).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
hathor/nanocontracts/custom_builtins.py	50.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1346      +/-   ##
==========================================
+ Coverage   85.65%   85.67%   +0.02%     
==========================================
  Files         425      425              
  Lines       32217    32217              
  Branches     5016     5016              
==========================================
+ Hits        27595    27602       +7     
+ Misses       3611     3604       -7     
  Partials     1011     1011              

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[github-actions]

Bencher Report

Branch	tests/nano/custom-import
Testbed	ubuntu-22.04

Click to view all benchmark results

Benchmark	Latency	Benchmark Result minutes (m) (Result Δ%)	Lower Boundary minutes (m) (Limit %)	Upper Boundary minutes (m) (Limit %)
sync-v2 (up to 20000 blocks)	📈 view plot 🚷 view threshold	1.70 m (+3.75%) Baseline: 1.64 m	1.48 m (86.75%)	1.81 m (94.32%)

🐰 View full continuous benchmarking report in Bencher