test: add java.lang.ref.* tests

[brianheineman]

No description provided.

[github-actions]

Bencher Report

Branch	add-reference-tests
Testbed	Linux

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Benchmark	Latency	nanoseconds (ns)
default_class_loader	📈 view plot ⚠️ NO THRESHOLD	6,682,100.00 ns
from_bytes	📈 view plot ⚠️ NO THRESHOLD	32,190.00 ns
hello_world	📈 view plot ⚠️ NO THRESHOLD	188,130,000.00 ns
load_hash_map	📈 view plot ⚠️ NO THRESHOLD	426.70 ns
load_invalid_class	📈 view plot ⚠️ NO THRESHOLD	19,503.00 ns
to_bytes	📈 view plot ⚠️ NO THRESHOLD	18,052.00 ns
to_string	📈 view plot ⚠️ NO THRESHOLD	123,540.00 ns
verify	📈 view plot ⚠️ NO THRESHOLD	815.97 ns
vm_init	📈 view plot ⚠️ NO THRESHOLD	177,670,000.00 ns

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.93%. Comparing base (a051385) to head (072d7fe).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #549   +/-   ##
=======================================
  Coverage   93.93%   93.93%           
=======================================
  Files         583      583           
  Lines       59336    59336           
=======================================
  Hits        55739    55739           
  Misses       3597     3597           

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