test(amber): cover AI assistant initialization

[aglinxinyuan]

What changes were proposed in this PR?

Adds focused unit coverage for the OpenAI assistant handshake: a successful local /models response verifies the GET request and normalized bearer key, while non-success and malformed-URL paths verify the fallback result.

Any related issues, documentation, discussions?

Closes #7152

How was this PR tested?

• WorkflowExecutionService/testOnly org.apache.texera.web.resource.aiassistant.AiAssistantManagerSpec — 3 succeeded.
• WorkflowExecutionService/Test/scalafmtCheck and WorkflowExecutionService/Test/scalafix --check.

Mutation proof:

Production mutation	Result
Changed the HTTP method from GET to POST	1 test failed
Reversed the responseCode == 200 condition	2 tests failed
Returned OpenAI from the exception fallback	1 test failed

Each mutation was reverted before the final green test run.

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

Generated-by: Codex (GPT-5)

[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

🟢 2 better · 🔴 1 worse · ⚪ 12 noise (<±5%) · 0 without baseline

Compared against main 45b7b20 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	406	0.248	24,375/32,821/32,821 us	🔴 +11.6% / 🔴 +107.9%
🟢	bs=100 sw=10 sl=64	923	0.563	106,345/128,213/128,213 us	🟢 -13.8% / 🔴 +16.2%
⚪	bs=1000 sw=10 sl=64	1,098	0.67	905,544/958,101/958,101 us	⚪ within ±5% / 🟢 -10.8%

Baseline details

Latest main 45b7b20 from same runner

config	metric	PR	latest main	7d avg	Δ latest	Δ 7d
bs=10 sw=10 sl=64	throughput	406 tuples/sec	422 tuples/sec	771.62 tuples/sec	-3.8%	-47.4%
bs=10 sw=10 sl=64	MB/s	0.248 MB/s	0.258 MB/s	0.471 MB/s	-3.9%	-47.3%
bs=10 sw=10 sl=64	p50	24,375 us	21,834 us	12,626 us	+11.6%	+93.1%
bs=10 sw=10 sl=64	p95	32,821 us	32,772 us	15,786 us	+0.1%	+107.9%
bs=10 sw=10 sl=64	p99	32,821 us	32,772 us	19,344 us	+0.1%	+69.7%
bs=100 sw=10 sl=64	throughput	923 tuples/sec	934 tuples/sec	971.56 tuples/sec	-1.2%	-5.0%
bs=100 sw=10 sl=64	MB/s	0.563 MB/s	0.57 MB/s	0.593 MB/s	-1.2%	-5.1%
bs=100 sw=10 sl=64	p50	106,345 us	104,269 us	103,463 us	+2.0%	+2.8%
bs=100 sw=10 sl=64	p95	128,213 us	148,767 us	110,296 us	-13.8%	+16.2%
bs=100 sw=10 sl=64	p99	128,213 us	148,767 us	118,690 us	-13.8%	+8.0%
bs=1000 sw=10 sl=64	throughput	1,098 tuples/sec	1,093 tuples/sec	1,001 tuples/sec	+0.5%	+9.7%
bs=1000 sw=10 sl=64	MB/s	0.67 MB/s	0.667 MB/s	0.611 MB/s	+0.4%	+9.6%
bs=1000 sw=10 sl=64	p50	905,544 us	918,821 us	1,008,988 us	-1.4%	-10.3%
bs=1000 sw=10 sl=64	p95	958,101 us	945,299 us	1,055,260 us	+1.4%	-9.2%
bs=1000 sw=10 sl=64	p99	958,101 us	945,299 us	1,074,689 us	+1.4%	-10.8%

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
0,10,10,64,20,492.87,200,128000,406,0.248,24375.38,32820.58,32820.58
1,100,10,64,20,2167.87,2000,1280000,923,0.563,106345.02,128213.10,128213.10
2,1000,10,64,20,18220.23,20000,12800000,1098,0.670,905544.36,958101.43,958101.43

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.62%. Comparing base (45b7b20) to head (7c4c25d).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #7156   +/-   ##
=========================================
  Coverage     79.62%   79.62%           
+ Complexity     3836     3834    -2     
=========================================
  Files          1160     1160           
  Lines         46188    46188           
  Branches       5145     5145           
=========================================
+ Hits          36777    36779    +2     
+ Misses         7778     7771    -7     
- Partials       1633     1638    +5     

Flag	Coverage Δ		*Carryforward flag
access-control-service	70.00% <ø> (ø)		Carriedforward from 91ed98d
agent-service	77.42% <ø> (ø)		Carriedforward from 91ed98d
amber	73.20% <ø> (+0.11%)	⬆️
computing-unit-managing-service	20.49% <ø> (ø)		Carriedforward from 91ed98d
config-service	65.97% <ø> (ø)		Carriedforward from 91ed98d
file-service	66.80% <ø> (ø)		Carriedforward from 91ed98d
frontend	83.08% <ø> (-0.08%)	⬇️	Carriedforward from 91ed98d
notebook-migration-service	78.89% <ø> (ø)		Carriedforward from 91ed98d
pyamber	97.31% <ø> (-0.05%)	⬇️	Carriedforward from 91ed98d
workflow-compiling-service	26.31% <ø> (ø)		Carriedforward from 91ed98d

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

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[mengw15]

LGTM

[Copilot]

Pull request overview

Adds a new ScalaTest spec in the Amber backend to unit-test the OpenAI “handshake” logic in AiAssistantManager by exercising the private initOpenAI method against a local in-process HTTP server.

Changes:

• Introduces AiAssistantManagerSpec to validate the /models probe uses GET and emits a normalized Authorization: Bearer … header.
• Adds negative-path coverage for non-200 responses and malformed configured service URLs.

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