test(workflow-operator): add unit tests for ImageTaskCodegen

[Ma77Ball]

What changes were proposed in this PR?

• Add common/workflow-operator/src/test/scala/org/apache/texera/amber/operator/huggingFace/codegen/ImageTaskCodegenSpec.scala, a new ScalaTest spec for ImageTaskCodegen, which previously had no dedicated unit tests.
• Cover the nine-task mapping.
• Cover image-only vs image-plus-prompt payload branches including the zero-shot label guard, and all parse branches.
• Confirm snippet determinism across contexts and no leakage of ctx string values.

Any related issues, documentation, discussions?

Closes: #6658

How was this PR tested?

• Run: sbt "WorkflowOperator/testOnly *ImageTaskCodegenSpec", expect all 15 tests passing.
• Test-only change; no production code is modified.

Was this PR authored or co-authored using generative AI tooling?

Co-authored with Claude Opus 4.8 in compliance with ASF

[github-actions]

Automated Reviewer Suggestions

Based on the git blame history of the changed files, we recommend the following reviewers:

• No candidates found from git blame history.

[github-actions]

⚠️ Benchmark changes need a look

🟢 0 better · 🔴 4 worse · ⚪ 11 noise (<±5%) · 0 without baseline

Compared against main 964e915 benchmarked on this same runner, so the delta is largely free of cross-runner hardware noise. The "7d avg" column still reflects the gh-pages dashboard. Treat <±5% as noise unless repeated.

Dashboard · Run

	config	throughput	MB/s	latency	max Δ latest / 7d
🔴	bs=10 sw=10 sl=64	552	0.337	17,406/27,952/27,952 us	🔴 +9.3% / 🔴 +73.4%
🔴	bs=100 sw=10 sl=64	1,162	0.709	82,135/126,238/126,238 us	🔴 +5.7% / 🟢 -19.0%
⚪	bs=1000 sw=10 sl=64	1,345	0.821	739,725/792,238/792,238 us	⚪ within ±5% / 🟢 +31.5%

Baseline details

Latest main 964e915 from same runner

config	metric	PR	latest main	7d avg	Δ latest	Δ 7d
bs=10 sw=10 sl=64	throughput	552 tuples/sec	566 tuples/sec	760.2 tuples/sec	-2.5%	-27.4%
bs=10 sw=10 sl=64	MB/s	0.337 MB/s	0.346 MB/s	0.464 MB/s	-2.6%	-27.4%
bs=10 sw=10 sl=64	p50	17,406 us	16,832 us	12,781 us	+3.4%	+36.2%
bs=10 sw=10 sl=64	p95	27,952 us	25,575 us	16,118 us	+9.3%	+73.4%
bs=10 sw=10 sl=64	p99	27,952 us	25,575 us	19,074 us	+9.3%	+46.5%
bs=100 sw=10 sl=64	throughput	1,162 tuples/sec	1,173 tuples/sec	988.68 tuples/sec	-0.9%	+17.5%
bs=100 sw=10 sl=64	MB/s	0.709 MB/s	0.716 MB/s	0.603 MB/s	-1.0%	+17.5%
bs=100 sw=10 sl=64	p50	82,135 us	82,405 us	101,448 us	-0.3%	-19.0%
bs=100 sw=10 sl=64	p95	126,238 us	119,411 us	107,410 us	+5.7%	+17.5%
bs=100 sw=10 sl=64	p99	126,238 us	119,411 us	120,258 us	+5.7%	+5.0%
bs=1000 sw=10 sl=64	throughput	1,345 tuples/sec	1,340 tuples/sec	1,023 tuples/sec	+0.4%	+31.5%
bs=1000 sw=10 sl=64	MB/s	0.821 MB/s	0.818 MB/s	0.624 MB/s	+0.4%	+31.5%
bs=1000 sw=10 sl=64	p50	739,725 us	743,371 us	983,888 us	-0.5%	-24.8%
bs=1000 sw=10 sl=64	p95	792,238 us	788,437 us	1,030,100 us	+0.5%	-23.1%
bs=1000 sw=10 sl=64	p99	792,238 us	788,437 us	1,056,513 us	+0.5%	-25.0%

Raw CSV

config_idx,batch_size,schema_width,string_len,num_batches,total_ms,total_tuples,total_bytes,tuples_per_sec,mb_per_sec,lat_p50_us,lat_p95_us,lat_p99_us
0,10,10,64,20,362.04,200,128000,552,0.337,17406.30,27951.71,27951.71
1,100,10,64,20,1720.65,2000,1280000,1162,0.709,82134.90,126238.26,126238.26
2,1000,10,64,20,14868.02,20000,12800000,1345,0.821,739725.47,792237.73,792237.73

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 74.68%. Comparing base (964e915) to head (27734ba).
⚠️ Report is 12 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #6659      +/-   ##
============================================
- Coverage     74.96%   74.68%   -0.28%     
- Complexity     3446     3450       +4     
============================================
  Files          1160     1157       -3     
  Lines         45795    45626     -169     
  Branches       5070     5027      -43     
============================================
- Hits          34328    34074     -254     
- Misses         9824     9902      +78     
- Partials       1643     1650       +7     

Flag	Coverage Δ		*Carryforward flag
access-control-service	70.00% <ø> (ø)
agent-service	76.76% <ø> (ø)		Carriedforward from c154e3c
amber	67.20% <ø> (+<0.01%)	⬆️
computing-unit-managing-service	20.49% <ø> (ø)
config-service	66.66% <ø> (ø)
file-service	67.21% <ø> (ø)
frontend	78.29% <ø> (-0.55%)	⬇️	Carriedforward from c154e3c
notebook-migration-service	78.94% <ø> (ø)
pyamber	91.83% <ø> (-0.32%)	⬇️	Carriedforward from c154e3c
workflow-compiling-service	55.14% <ø> (ø)

*This pull request uses carry forward flags. Click here to find out more.

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[aglinxinyuan]

Please fix the scalafmtCheck.

[Copilot]

Pull request overview

Adds a dedicated ScalaTest spec for the Hugging Face ImageTaskCodegen to validate its handled task set and to regression-test key payload/parse snippet branches (including determinism and “no CodegenContext string leakage”).

Changes:

• Introduce ImageTaskCodegenSpec covering the nine-task mapping and core payload/parse branches.
• Add regression checks for snippet determinism across CodegenContext values and for absence of raw context-string inlining.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[aglinxinyuan]

LGTM!

[aglinxinyuan]

This test is failing the CI.

[Ma77Ball]

I had to lint the branch. It should work now.