GROOVY-12117: adding tests for some edge cases

[blackdrag]

This test is an attempt to clarify some semantic gaps in our tests for traits

[github-actions]

⚠️ Performance Alert ⚠️

Possible performance regression was detected for benchmark.
Benchmark result of this commit is worse than the previous benchmark result exceeding threshold 1.50.

Benchmark suite	Current: f27a508	Previous: 93f3d16	Ratio
org.apache.groovy.perf.grails.DynamicDispatchBench.methodMissingSavePattern	38.83550699247537 ms/op	23.4392629811486 ms/op	1.66

This comment was automatically generated by workflow using github-action-benchmark.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 68.5524%. Comparing base (c1f1e5e) to head (f27a508).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@                Coverage Diff                 @@
##               master      #2646        +/-   ##
==================================================
+ Coverage     68.5485%   68.5524%   +0.0039%     
- Complexity      33744      33746         +2     
==================================================
  Files            1523       1523                
  Lines          127940     127940                
  Branches        23254      23254                
==================================================
+ Hits            87701      87706         +5     
+ Misses          32459      32455         -4     
+ Partials         7780       7779         -1     

see 5 files with indirect coverage changes

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[github-actions]

JMH summary — classic (commit 4bf7e7c)

Speedup vs trailing 90-day baseline on gh-pages. Higher = faster.
1.00 = in line with history. Per-benchmark ratio, geomean within group.
Time-per-op units inverted so direction is consistent.

Group	Speedup	n
bench	1.007 ×	26
core	1.063 ×	77
grails	0.977 ×	80

_{Baseline: dev/bench/jmh/<part>/classic/data.js on gh-pages, trailing 90 days. Daily dashboard · Per-suite raw data}

[github-actions]

JMH summary — indy (commit 4bf7e7c)

Speedup vs trailing 90-day baseline on gh-pages. Higher = faster.
1.00 = in line with history. Per-benchmark ratio, geomean within group.
Time-per-op units inverted so direction is consistent.

Group	Speedup	n
bench	0.967 ×	26
core	3.568 ×	77
grails	2.271 ×	80

_{Baseline: dev/bench/jmh/<part>/indy/data.js on gh-pages, trailing 90 days. Daily dashboard · Per-suite raw data}

[testlens-app]

✅ All tests passed ✅

🏷️ Commit: f27a508
▶️ Tests: 98887 executed
⚪️ Checks: 31/31 completed

---

Learn more about TestLens at testlens.app.

[paulk-asert]

@blackdrag I tried to merge these into the existing test hierarchy. Let me know if you spot any problems.
416652c