vllm-omni-test

name

vllm-omni-test

description

Generate and run tests for vllm-project/vllm-omni with CI-aligned levels and markers; wire new tests into Buildkite (test-ready.yml for L1/L2, test-merge.yml for L3, test-nightly.yml for L4). On completion, always provide copy-paste local and CI-like pytest commands plus prerequisites. Use when creating regression tests, adding L1-L4 coverage, selecting pytest markers, or validating fixes from issues/PRs.

vLLM-Omni Test Generator & Runner

Purpose

Use this skill to generate minimal, stable test cases and run them with the correct marker/level strategy for vllm-project/vllm-omni.

Link convention: Paths such as .buildkite/ and docs/contributing/ live at the vllm-omni repo root. Markdown links use repo-relative paths from this skill file (e.g. ../../../.buildkite/cuda/test-ready.yml, ../../../docs/contributing/ci/test_system_overview.md).

Default priorities:

1. Reproducible regression coverage for bug fixes
2. Correct test level and marker selection
3. Low flake, low dependency tests first
4. CI-compatible run commands
5. Actionable run commands for the human: whenever you add or change tests, always finish with copy-paste-ready pytest lines (local: single file and/or single test; CI-like: markers + --run-level), plus short prerequisites (GPU tier, HF cache, optional model_prefix). Do not assume the reader will infer commands from test-routing.md alone.

Inputs

• Issue/PR link and summary
• Changed files or suspected code path
• Whether the user wants local quick validation or CI-equivalent validation
• Hardware constraints (CPU only / CUDA / ROCm / NPU)

Workflow

Step 1: Classify Test Goal

• Bugfix regression: start from a minimal failing scenario and add assertions that prevent recurrence. Before writing tests, output required / recommended / not_needed: required — stable logic/contract bug that should have been caught; recommended — environment-sensitive but a small regression still helps; not_needed — one-off external/config failure or existing tests already cover the path. Prefer the narrowest stable L1 (CPU) case; escalate to L2/L3 only when the bug needs real weights or serving.
• Feature coverage: verify new behavior and one negative/boundary case.
• Perf/benchmark claim: require benchmark-oriented tests and explicit metrics.

Step 2: Select Test Level

• L1: unit/logic, deterministic, CPU-friendly, fastest feedback.
• L2: basic e2e/integration and platform-dependent checks.
• L3/L4: advanced model/integration/perf validation.

Use references/test-routing.md for level-to-marker and command mapping.

Step 3: Pick Markers

Always attach markers deliberately:

• Level: core_model (L1/L2) and/or advanced_model (L3) and/or full_model (L4 nightly)
• Model type (required on model-centric e2e — pick exactly one):
  • omni — end-to-end multimodal LLM pipelines (thinker/talker/stages; Qwen-Omni family)
  • tts — speech synthesis / TTS-only models (/v1/audio/speech, voice clone, etc.)
  • diffusion — generative diffusion models (image / audio / text / video from noise)
• Cross-cutting area (when relevant): parallel, cache, example, benchmark
• Hardware: cpu, gpu, cuda, rocm, npu, …; SKU (H100, L4, …) and cards_{n} via @hardware_test(...) / hardware_marks(...) only — never pytest.mark.H100 (check-mark rejects it)
• Optional: slow. Multi-card: num_cards=N on the helper (filter with cards_N / not cards_1)

Baseline smoke (L2 + L3): The simplest e2e case per model — default deploy, minimal request — should usually carry both @pytest.mark.core_model and @pytest.mark.advanced_model on the same test function so test-ready.yml and test-merge.yml share one test. send_*_request picks validation depth from --run-level. References: test_voxcpm2_tts.py::test_text_to_audio_001, test_qwen3_tts_customvoice.py::test_text_to_audio_001. Heavier scenarios use advanced_model only; L4 expansion uses full_model.

For hardware-aware tests, prefer @hardware_test(...) or hardware_marks(...) in tests/helpers/mark.py.

Diffusion nightly split (test-nightly.yml): all diffusion tests use pytest.mark.diffusion, but CI groups them by output modality, not by separate pytest markers:

Nightly group	Scope	Typical models / paths
Diffusion X2I(&A&T) Model Test	x2i (image), x2a (audio), x2t (text) and other non-video diffusion	Qwen-Image*, BAGEL, FLUX, SD3, Z-Image, LongCat, DreamZero, … — test_*_expansion.py under X2I shards; L4 sweep uses -k "not test_wan and not test_bagel_expansion and not hunyuan" for L4
Diffusion X2V Model Test	x2v (video) only	Wan2.2, HunyuanVideo 1.5, Wan VACE, … — e.g. test_wan22_expansion.py, test_hunyuan_video_15_expansion.py

Wire new video diffusion expansion tests into the X2V group; wire image/audio/text diffusion expansion tests into X2I(&A&T). Do not place x2v modules in X2I shards (see comment in test-nightly.yml above the X2I group).

Naming: generated test module files (L2–L4, model-centric e2e)

When adding new pytest modules whose primary scope is a specific model (typical under tests/e2e/offline_inference/ or tests/e2e/online_serving/), use this filename pattern:

Level	Filename pattern	Example (model Qwen/Qwen2.5-Omni-7B)
L2, L3	test_{lowercase_model_slug}.py	test_qwen2_5_omni.py
L4	test_{lowercase_model_slug}_expansion.py	test_qwen2_5_omni_expansion.py

Slug rules for {lowercase_model_slug}:

1. Start from the HuggingFace-style id (e.g. Qwen/Qwen2.5-Omni-7B), but do not put the org into the filename: use the repo segment only (Qwen2.5-Omni-7B), not Qwen_... / qwen_qwen2_5_....
2. Lowercase; replace ., -, and whitespace with a single _ (e.g. Qwen2.5-Omni-7B → qwen2_5_omni). Omit trailing size tokens such as 7b / 30b in the basename when a single file covers that model line in the directory (matches test_qwen2_5_omni.py in-tree).
3. If two checkpoints in the same folder need separate modules, add a minimal disambiguator (e.g. _7b vs _3b) only then.
4. L1 unit tests are not bound to this pattern; use tests/<area>/test_<feature>.py as today.

Routing tables and commands: references/test-routing.md § Model-centric e2e filename convention.

Existing references: tests/e2e/offline_inference/test_qwen2_5_omni.py (L2-style omni), tests/e2e/offline_inference/test_qwen3_5_9b.py (L2-style omni, single-stage VL), tests/e2e/online_serving/test_qwen3_omni_expansion.py (L4-style omni), tests/e2e/online_serving/test_qwen_image_edit_expansion.py / test_qwen_image_expansion.py (L4-style diffusion).

Step 4: Generate Test Case Skeleton

1. Pick the functional scenario (then choose directory, fixtures, and markers):

Scenario	Typical location	Fixtures / runner pattern	Baseline markers & level
Offline inference e2e	tests/e2e/offline_inference/	Module (default): omni_runner + offline_client. Function (isolation only): omni_runner_function + offline_client_function. Diffusion/TTS may use Omni(...).generate directly	L2: core_model + one of omni / tts / diffusion; @hardware_test(...) when GPU/NPU is required
Online serving e2e	tests/e2e/online_serving/	Module (default): omni_server + online_client. Function (isolation only): omni_server_function + online_client_function. Clients: send_omni_request (omni), send_audio_speech_request (tts), send_diffusion_request / send_video_diffusion_request / send_images_generations_request (diffusion)	Baseline smoke: core_model + advanced_model; heavier paths: advanced_model only; L4 expansion: full_model
Documentation / runnable examples	tests/examples/offline_inference/, tests/examples/online_serving/	Offline docs (preferred): extract Python/Bash blocks from the doc README (e.g. ReadmeSnippet.extract_readme_snippets), pytest.mark.parametrize each snippet, run via example_runner.run with a stable output_subfolder. Online docs: copy client/request scripts into dedicated tests and keep them in sync with the doc page.	Usually L4: advanced_model, often example plus hardware marks matching the nightly docs-example job (see ). Full conventions: (introduced in : naming, output directory layout, skip rules, avoid trimming without a strong CI reason).

If the user’s test plan includes invalid parameter validation / invalid params / negative HTTP / 400 validation: do not add those test_* functions to tests/e2e/online_serving/test_*.py or *_expansion.py. Move or author them under tests/dfx/reliability/invalid_param_test/ in the endpoint-matching script (see Invalid parameter validation below). Success-path e2e and invalid-param dfx tests must stay in separate modules.

1b. Model type — omni vs tts vs diffusion

After choosing offline/online/docs/perf, classify the product under test and attach exactly one model-type marker. All three can live under the same tests/e2e/ trees; conventions diverge:

Dimension	Omni (pytest.mark.omni)	TTS (pytest.mark.tts)	Diffusion (pytest.mark.diffusion)
What it is	Multimodal LLM pipeline (thinker/talker/stages; text + vision + audio I/O)	Speech synthesis / voice models	Generative diffusion (noise → image, audio, text, or video)
Examples	Qwen2.5-Omni, Qwen3-Omni	Qwen3-TTS, VoxCPM2, Higgs-Audio, Step-Audio2	Qwen-Image, BAGEL, Wan2.2, HunyuanVideo
Offline runner	omni_runner + offline_client, generate_multimodal	Omni(...).generate with deploy YAML + TTS params	Omni(...).generate + OmniDiffusionSamplingParams
Online client	online_client.send_omni_request (chat completions, modalities)	online_client.send_audio_speech_request (/v1/audio/speech)	send_diffusion_request (chat/T2I), send_video_diffusion_request (/v1/videos, X2V), or send_images_generations_http_request / send_images_edits_http_request (DALL-E routes)
Typical assertions	Stage outputs, text/audio keywords via OfflineOmniClient / response handler	WAV bytes, stream chunks, speech endpoint contract	Image/video dimensions, final_output_type, assert_diffusion_response
Deploy YAML	Per-model deploy configs (ci/qwen3_omni_moe.yaml, …)	qwen3_tts.yaml, voxcpm2.yaml, …	Often default serve; parallel/offload YAML for heavy DiT
Nightly group (test-nightly.yml)	Omni Model Test — -m "full_model and omni"	—

Do not mix fixtures across types (e.g. do not use omni_runner layout for a pure diffusion or TTS model without mirroring an in-tree test in that family).

Diffusion only — X2I(&A&T) vs X2V (nightly routing, not extra markers):

• X2I(&A&T): image / audio / text generation — Qwen-Image*, FLUX, SD3, Z-Image, BAGEL (expansion), LongCat, audio diffusion, etc.
• X2V: video generation only — Wan2.2, HunyuanVideo 1.5, Wan VACE, LTX video similarity paths.

When adding a new test_*_expansion.py, place it in the matching nightly group step (explicit file list in test-nightly.yml), not only by marker expression.

2. Use the narrowest deterministic skeleton for the scenario

L1 unit / logic (CPU-first):

Mocking rule (L1 only): use pytest integration — mocker (pytest-mock) or monkeypatch (built-in). Do not import or call unittest.mock (patch, MagicMock, @patch, with patch(...), etc.) in L1 tests; patches must auto-revert with the test lifecycle.

import pytest

pytestmark = [pytest.mark.core_model, pytest.mark.cpu]


def test_<scenario_name>(mocker):
    # Prefer mocker.patch / mocker.spy / mocker.Mock — not unittest.mock.patch
    fake_fn = mocker.patch("vllm_omni.some.module.expensive_call", return_value=...)
    # Act
    # Assert
    fake_fn.assert_called_once()


def test_<env_or_attr>(monkeypatch):
    # For simple env / attribute substitution without a Mock object
    monkeypatch.setenv("SOME_FLAG", "1")
    monkeypatch.setattr("vllm_omni.some.module.CONST", 42)
    ...

Avoid in L1:

# BAD — do not use in L1 unit tests
from unittest.mock import patch, MagicMock

@patch("vllm_omni.some.module.fn")
def test_bad(mock_fn): ...

def test_also_bad():
    with patch("...") as m: ...

See L1 unit test constraints (mocking) below for the full do/don't list.

Offline multimodal e2e — Omni (representative):

@pytest.mark.core_model
@pytest.mark.omni
@hardware_test(...)
@pytest.mark.parametrize("omni_runner", test_params, indirect=True)
def test_<scenario>(omni_runner, offline_client) -> None:
    request_config = {"prompts": ..., "modalities": [...]}  # optional: images, videos, audios
    offline_client.send_omni_request(request_config)

Offline generative e2e — Diffusion (representative):

@pytest.mark.core_model
@pytest.mark.diffusion
@hardware_test(...)
@pytest.mark.parametrize("omni_runner", test_params, indirect=True)
def test_text_to_image_001(offline_client) -> None:
    offline_client.send_diffusion_request({"prompt": "...", "extra_body": {"num_inference_steps": 4, ...}})

Offline TTS e2e — Qwen3-TTS (two-stage; representative):

@pytest.mark.advanced_model
@pytest.mark.tts
@hardware_test(...)
@pytest.mark.parametrize("omni_runner", tts_server_params, indirect=True)
def test_text_to_audio_001(omni_runner, offline_client) -> None:
    offline_client.send_audio_speech_request({
        "input": "...",
        "task_type": "Base",
        "ref_audio": REF_AUDIO_URL,
        "ref_text": REF_TEXT,
    })

Offline TTS e2e — single-stage (Coqui XTTS, MOSS-TTS-Nano; representative):

@pytest.mark.advanced_model
@pytest.mark.tts
@hardware_test(...)
@pytest.mark.parametrize("omni_runner", tts_server_params, indirect=True)
def test_voice_clone_001(offline_client) -> None:
    offline_client.send_single_stage_tts_request({
        "input": "...",
        "language": "en",
        "prompt_audio_path": REF_AUDIO_PATH,
        "response_format": "wav",
        "run_level": "advanced_model",
    })

Online serving e2e — Omni (representative):

@pytest.mark.core_model
@pytest.mark.omni
@hardware_test(...)
@pytest.mark.parametrize("omni_server", test_params, indirect=True)
def test_text_to_text_001(omni_server, online_client) -> None:
    request_config = {"model": omni_server.model, "messages": ..., "modalities": ["text"]}
    online_client.send_omni_request(request_config)

Online serving e2e — TTS (representative):

@pytest.mark.core_model
@pytest.mark.advanced_model
@pytest.mark.tts
@hardware_test(...)
@pytest.mark.parametrize("omni_server", tts_server_params, indirect=True)
def test_text_to_audio_001(omni_server, online_client) -> None:
    request_config = {"model": omni_server.model, "input": "...", "response_format": "wav", ...}
    online_client.send_audio_speech_request(request_config)

Online serving e2e — Diffusion X2I (representative):

@pytest.mark.core_model
@pytest.mark.diffusion
@pytest.mark.parametrize("omni_server", _get_default_case(MODEL), indirect=True)
def test_text_to_image_001(omni_server, online_client) -> None:
    online_client.send_diffusion_request({...})  # chat completions + extra_body

Online serving e2e — Diffusion X2V (representative):

@pytest.mark.core_model
@pytest.mark.diffusion
def test_text_to_video_001(omni_server, online_client) -> None:
    online_client.send_video_diffusion_request({"model": ..., "form_data": {...}})  # /v1/videos

Documentation example tests: follow the Preferred Test Strategy in l4_doc_example_tests.inc.md: dynamic extraction for offline READMEs; explicit copied client code for online pages until extraction is justified; use the documented naming, output directory (page folder + case id), and skipping rules (e.g. Gradio-only scripts).

Performance tests: add or extend entries under tests/dfx/perf/tests/ (and JSON configs where the project uses them), with explicit baselines, mark on each case (hardware_marks + full_model + type marker), and the same nightly Perf step pattern as in-tree configs.

3. Cross-cutting rules

• New .py files need the Omni SPDX header (Copyright contributors to the vLLM-Omni project, not vLLM project). tests/ may keep stdlib re/base64; pickle is still banned unless the file is already on the pickle allowlist. Every collected tests/**/test_*.py needs a CI level mark and a hardware platform mark/helper (check-mark runs locally; GHA skips it). Do not write pytest.mark.H100 / pytest.mark.L4; use the helpers so cards_{n} is attached. Do not grow allowed_files to land a test. Policy: docs/contributing/README.md.
• Reuse existing fixtures for the chosen scenario; do not mix “online client” assumptions into offline OmniRunner tests without a clear reason.
• Avoid external network dependency in assertions unless the scenario is explicitly “online serving” or doc examples that require a model hub (then align with CI secrets/cache).
• Keep one test function = one intent (one modality combo, one endpoint contract, or one acceleration combo).
• E2E test function layout: one case → one test_<scenario> function with a name that states what is validated (endpoint, size/n, server flag, or route). Do not merge multiple cases into a single test that branches on request.node.callspec.id, param.id, or if case_id == .... Use @pytest.mark.parametrize("omni_server", [...], indirect=True) per function (usually one OmniServerParams per test). A loop inside one test is OK only when it serves that function’s single intent (e.g. three standard sizes in test_*_sizes_256_512_1024).
• Runtime fixture scope (tests/helpers/fixtures/runtime.py): default omni_server / omni_runner (module) + matching client/handler; use omni_server_function / omni_runner_function only when each test_* must start a fresh instance (see below).

L1 unit test constraints (mocking)

L1 tests (core_model and cpu, under tests/diffusion/, tests/engine/, tests/model_executor/, etc.) must follow the repo’s pytest-mock convention (pytest-mock>=3.10.0 in pyproject.toml [project.optional-dependencies] dev).

Do	Don't
def test_foo(mocker): + mocker.patch(...), mocker.spy(...), mocker.Mock(), mocker.MagicMock(), mocker.AsyncMock()	from unittest.mock import patch, MagicMock, Mock, AsyncMock
def test_bar(monkeypatch): + monkeypatch.setattr / setenv / delenv / setitem	@patch(...) decorator
Let mocker auto-stop patches after the test	with patch(...): / patch.object(...) context managers
Mirror neighboring L1 tests in the same directory	unittest.mock.create_autospec unless an existing file already documents an exception

Rationale: mocker ties patch lifecycle to pytest fixtures (no leaked patches across tests). unittest.mock decorators/context managers are easy to compose incorrectly with parametrized or async tests and are inconsistent with in-tree L1 style.

Minimal patterns:

def test_returns_cached_config(mocker):
    loader = mocker.patch(
        "vllm_omni.foo.load_yaml",
        return_value={"stages": []},
    )
    result = get_deploy_config("ci/foo.yaml")
    assert result["stages"] == []
    loader.assert_called_once_with("ci/foo.yaml")


def test_skips_when_env_unset(monkeypatch):
    monkeypatch.delenv("VLLM_OMNI_FEATURE", raising=False)
    assert should_enable_feature() is False

E2E levels (L2+) generally avoid mocks; if a rare L2 stub is unavoidable, still prefer mocker over unittest.mock for consistency.

Runtime fixtures — scope (tests/helpers/fixtures/runtime.py)

vLLM-Omni e2e tests start a real OmniServer (online) or OmniRunner (offline). Pick scope by how often the process must be recreated, not by test level alone.

Scope	Online fixtures	Offline fixtures	When to use
Module (default)	omni_server → online_client	omni_runner → offline_client	Default for L2/L3/L4 expansion — amortize model/server init across test_* in the same module. Same OmniServerParams / runner config can be reused by multiple tests.
Function	omni_server_function → online_client_function	omni_runner_function → offline_client_function	Only when required — each test_* must get a clean server/runner (no shared engine/GPU state). Typical: tests/dfx/reliability/, sleep/wakeup, crash/restart, tests that mutate global server state.

Rules:

1. Default to module scope (omni_server / omni_runner) unless the scenario explicitly needs a fresh instance per test function.
2. Indirect parametrize name must match the fixture name: @pytest.mark.parametrize("omni_server", ...) with omni_server + online_client; @pytest.mark.parametrize("omni_server_function", ...) with omni_server_function + online_client_function. Do not mix module fixture with function client (or vice versa).
3. Different OmniServerParams per test_* (e.g. default vs --enable-cpu-offload) is still OK with module omni_server — pytest parametrizes per test node; only switch to _function when isolation between tests matters, not merely because server_args differ.
4. One test_* with many server configs (expansion matrix) → single function + @pytest.mark.parametrize("omni_server", [...], indirect=True) + module omni_server (see in-tree test_qwen_image_expansion.py).

# Default — module-scoped server (L4 expansion)
@pytest.mark.parametrize("omni_server", [pytest.param(OmniServerParams(model=MODEL), marks=H100)], indirect=True)
def test_foo_images_generations_default_1024(omni_server, online_client) -> None:
    online_client.send_images_generations_request({...})

# Function-scoped — reliability / per-test clean state only
@pytest.mark.parametrize(
    "omni_server_function",
    [pytest.param(OmniServerParams(model=MODEL), marks=H100)],
    indirect=True,
)
def test_foo_sleep_wakeup_cycle(omni_server_function, online_client_function) -> None:
    online_client_function.send_omni_sleep_http_request({...})
    online_client_function.send_omni_wakeup_http_request({...})

Runtime send helpers — online and offline (tests/helpers/runtime.py)

L2+ e2e (online serving and offline inference) must call APIs through tests/helpers/runtime.py. Fixtures live in tests/helpers/fixtures/runtime.py; send/assert implementation lives in tests/helpers/runtime.py + tests/helpers/assertions.py.

Principle	Action
Reuse first	Grep runtime.py for an existing send_*_request on OnlineOmniClient (online) or OfflineOmniClient (offline) that matches the endpoint / pipeline shape.
Extend when close	If an existing send_*_request almost fits (e.g. missing one optional field), extend it in runtime.py — do not fork logic in the test file.
Add when missing	No suitable helper → add send_<feature>_request (high-level: call + general assert_*) or send_<route>_<verb>_http_request (low-level HTTP for negative/dfx) in runtime.py first, then call it from tests.
Test module owns payload only	In test_*.py: MODEL, deploy path, vendored media, get_prompt(), and inline request_config dicts only. No omni.generate(...), raw requests.post, OpenAI SDK calls, or _collect_audio() / _process_output() in e2e tests.

Online (online_client from omni_server): OnlineOmniClient.send_*_request.

Offline (offline_client from omni_runner): OfflineOmniClient.send_*_request.

Do	Don't
Online: online_client.send_omni_request, send_diffusion_request, send_audio_speech_request, send_video_diffusion_request, send_images_generations_request, …	requests.post(f"{base_url}/v1/...", json=…) or client.chat.completions.create(...) inside a test
Offline: offline_client.send_omni_request, send_diffusion_request, send_audio_speech_request, send_single_stage_tts_request, send_single_stage_tts_batch_request, …	omni_runner.omni.generate(...) + hand-rolled tensor/WAV extraction in test_*.py
Add missing send_* to runtime.py first; bundle general assert_* inside the send helper	A one-off def _post_* / def _collect_audio at the bottom of a test module
Mirror naming/style of neighboring send_* (docstring, request_config dict, optional run_level, err_code / err_message for negative cases)	Different parameter shapes per test file for the same endpoint

Workflow when generating online/offline e2e tests:

1. Decide whether the needed check is general (every success call of this send_*) or special (one case / one parameter combo only). See General vs special assert placement below.
2. Search runtime.py for a matching send_*_request; if missing, add it (with general assert_* inside) before writing the test body.
3. In the test module: build request_config → call send_*_request only for the general contract; call assert_* in the test file only for special, case-specific checks (import from assertions.py).
4. Reserve low-level send_*_http_request for negative/dfx tests (err_code / err_message) — not for ordinary L2+ success-path e2e.
5. When wiring Buildkite source_file_dependencies, include tests/helpers/runtime.py and/or tests/helpers/assertions.py when new helpers were added.

Exceptions (document in the test docstring why): models whose offline prompt path cannot go through existing handlers yet (e.g. test_higgs_audio_v2.py, test_voxtral_tts.py with custom tokenizer compose) may call omni.generate directly until a send_*_request is added to runtime.py — treat as debt, not the default for new TTS/diffusion/omni e2e.

General vs special assert placement:

Kind	Definition	Where it lives	Test file calls
General	Default success contract for this endpoint/client method — e.g. HTTP 200, data[] shape, n count, size dimensions, decodable image/audio, bundled omni/diffusion fields	Implement in assertions.py, invoke inside send_*_request in runtime.py (after low-level send / SDK call, when err_code is not set)	send_*_request only — do not repeat the same assert_*
Special	Extra check tied to this test case only — e.g. seed byte-identical replay, accuracy/CLIP threshold, perf ceiling, model-specific optional field	Add or reuse assert_* in assertions.py (never inline in test)	send_*_request then assert_<special>(...) once for that case

Changing request_config fields (size, n, seed, server flags) is not special validation — the general assert_* should read those from request_config inside send_*.

send_* ↔ assert_* pairing (online OnlineOmniClient):

High-level send_* (prefer in L2+ e2e)	Assert already invoked inside runtime.py	Low-level HTTP-only sibling
send_omni_request	assert_omni_response	send_chat_completions_http_request → assert_http_error only
send_diffusion_request	assert_diffusion_response	—
send_audio_speech_request	assert_audio_speech_response	send_audio_speech_http_request → assert_http_error only
send_video_diffusion_request	assert_diffusion_response	send_videos_*_http_request → assert_http_error only
send_images_generations_request (add when needed)	assert_images_generations_response (general — inside send)	send_images_generations_http_request → assert_http_error only
send_images_edits_request (add when needed)	assert_images_edits_response (general — inside send)	send_images_edits_http_request → assert_http_error only

Rule: Tests call high-level send_*_request for the general contract. Never call the same bundled assert_* again. Call an extra assert_* in the test only for special, case-specific validation.

Common OnlineOmniClient entry points (non-exhaustive — grep runtime.py before adding):

Area	High-level (SDK + assert)	Low-level HTTP (*_http_request)
Omni chat	send_omni_request	send_chat_completions_http_request
Diffusion T2I (chat route)	send_diffusion_request	—
Diffusion X2V	send_video_diffusion_request	send_videos_create_http_request, send_video_content_http_request, …
DALL-E T2I / edit	send_images_generations_request, send_images_edits_request	send_images_generations_http_request, send_images_edits_http_request
TTS (online)	send_audio_speech_request	send_audio_speech_http_request, send_audio_generate_http_request, …
Ops / meta	—	send_health_http_request, send_models_http_request, send_omni_sleep_http_request, …

Common OfflineOmniClient entry points (offline — grep runtime.py before adding):

Area	High-level (send_*_request + assert)	Notes
Omni multimodal	send_omni_request	generate_multimodal path
Diffusion offline	send_diffusion_request	chat-route / OmniTextPrompt offline
Qwen-style TTS	send_audio_speech_request	two-stage, generate_multimodal + mm_processor_kwargs
Single-stage TTS (Coqui XTTS, MOSS-TTS-Nano, …)	send_single_stage_tts_request, send_single_stage_tts_batch_request	prompt + additional_information + omni.generate — do not duplicate in tests
New model family	Add send_<family>_request here first	Then call from tests/e2e/offline_inference/test_*.py

L1 tests under tests/entrypoints/ may use FastAPI TestClient or direct handler calls with mocks; they do not need OnlineOmniClient / OfflineOmniClient. L2+ online and offline e2e must use runtime.py send_* helpers.

Invalid parameter validation (tests/dfx/reliability/invalid_param_test/)

When the user asks for invalid parameter validation, invalid request bodies, HTTP 4xx contract tests, or any case that sends malformed / out-of-range / mismatched API payloads against a live server:

1. Do not place these in tests/e2e/online_serving/ or *_expansion.py. If already drafted there, move the test_* into the correct invalid_param_test script and delete the duplicate from e2e.
2. Pick the script by HTTP route (extend an existing file; add a new test_invalid_<area>.py only when no in-tree script covers that route family):

API / area	Script
Omni chat completions, WebSocket video/realtime paths	test_invalid_omni_chat.py
POST /v1/audio/speech, stream, batch, voices	test_invalid_audio_speech.py
Audio diffusion endpoints	test_invalid_audio_diffusion.py
POST /v1/images/generations	test_invalid_image_generation.py
POST /v1/images/edits	test_invalid_image_editing.py
POST/GET/DELETE /v1/videos*	test_invalid_video_generation.py
Sleep / wakeup / server control	test_invalid_server_control.py

3. Match in-tree style in the chosen script:

Element	Convention
Module markers	pytestmark = [pytest.mark.slow, pytest.mark.<omni or tts or diffusion>]
Server fixture	_PARAMS / _QWEN3_TTS_SPEECH-style list of pytest.param(OmniServerParams(...), id="...", marks=hardware_marks(...)); @pytest.mark.parametrize("omni_server", _PARAMS, indirect=True)
Hardware	hardware_marks(res={"cuda": "H100"}) for heavy diffusion/omni/video; hardware_marks(res={"cuda": "L4"}) for smaller TTS models (must match weekly -m "slow and L4" step)
HTTP client	Low-level online_client.send_*_http_request({..., "err_code": 400, "err_message": (...)} ) — not send_*_request (success path)
Case shape	Prefer one test_* per route family + @pytest.mark.parametrize("body_spec, err_message", [...]) with stable id= per case; or dedicated test_<route>_malformed_json when not parametrized
Body helpers	_minimal_<endpoint>_json(omni_server) / _minimal_*_form_data(); merge overrides with body.update(body_spec)
Known gaps	pytest.mark.skip(reason="…#3649") as _SKIP_ISSUE_3649 when server validation is not yet strict (mirror neighboring cases)
Sections	Route banner comments (# ─── POST /v1/images/generations ───) like existing files
Shared fixtures	Reuse tests/dfx/reliability/invalid_param_test/conftest.py (tiny_png_bytes, env defaults)

4. Adding a new model to invalid-param coverage: append a pytest.param(OmniServerParams(model="...", stage_config_path=..., server_args=...), ...) entry to the script’s _PARAMS list — do not create test_invalid_<model>.py unless the route is new.

5. CI — .buildkite/cuda/test-weekly.yml only (not test-ready.yml / test-merge.yml / test-nightly.yml):

Weekly step	Command	When your cases run
Invalid parameters Test · H100	pytest -s -v tests/dfx/reliability/invalid_param_test/ -m "slow and H100"	Diffusion / omni / video invalid-param tests with H100 hardware mark
Invalid parameters Test · L4	pytest -s -v tests/dfx/reliability/invalid_param_test/ -m "slow and L4"	TTS / lighter models marked L4

• Trigger: build.env("WEEKLY") == "1" or PR label weekly-test.
• Default: extending an existing invalid_param_test script needs no YAML edit — the weekly steps already sweep the whole directory.
• Edit YAML only when adding a new hardware queue, a new top-level script that must run in isolation, or a model-specific weekly shard (mirror neighboring reliability steps).
• Weekly steps do not use source_file_dependencies.

Example — append to test_invalid_image_generation.py:

@pytest.mark.parametrize(
    "body_spec, err_message",
    [
        pytest.param({"seed": -1}, ("seed", "greater_than_equal", "0"), id="seed_negative"),
    ],
)
@pytest.mark.parametrize("omni_server", _PARAMS, indirect=True)
def test_images_generations_invalid_requests(
    omni_server: OmniServer,
    online_client: OnlineOmniClient,
    body_spec: dict[str, object],
    err_message: str | tuple[str, ...],
) -> None:
    body = _minimal_images_gen_json(omni_server)
    body.update(body_spec)
    online_client.send_images_generations_http_request(
        {"json": body, "timeout": 300, "err_code": 400, "err_message": err_message}
    )

See references/test-routing.md Invalid parameter / weekly CI.

Assertion helpers (tests/helpers/assertions.py)

Do not add module-local helpers such as _assert_images_generations_payload or _send_and_assert_* in e2e test files. Response/media validation belongs in tests/helpers/assertions.py, grouped by category:

Category	Existing anchors	When to extend vs add
Image (chat diffusion + DALL-E JSON)	assert_image_diffusion_response, assert_image_valid	DALL-E /v1/images/generations JSON → add assert_images_generations_response beside image helpers (reuses assert_image_valid); do not fork decode logic into tests
Video	assert_video_diffusion_response, assert_video_valid	Extend these for new video contracts
Audio	assert_audio_diffusion_response, assert_audio_speech_response, assert_audio_valid	Extend for new TTS/audio endpoints
Omni multimodal	assert_omni_response	Extend for new modality combos
HTTP errors	assert_http_error, assert_err_message_in_text	Used inside low-level send_*_http_request and negative tests

Do	Don't
Put general assert_* inside send_*_request in runtime.py; tests call send_*_request only	Call assert_diffusion_response after send_diffusion_request (general assert already bundled)
Put special assert_* in assertions.py and call it in the test after send_*_request when that case needs extra checks	Put general decode/count/size logic in the test because “this case uses n=4” (that belongs in general assert reading request_config)
Extend the matching category function, or add assert_<endpoint>_response next to its category	_send_and_assert_* or PIL/base64 loops in test_*.py
Use low-level send_*_http_request in dfx/negative tests (err_code)	Use low-level HTTP send + manual general assert in every L2+ expansion file

Workflow when generating tests:

1. Implement or reuse general assert_* in assertions.py (by category).
2. Wire it into send_*_request in runtime.py if not already bundled.
3. In the test: request_config → send_*_request. Add a separate assert_* import/call only for special case validation.
4. Update source_file_dependencies when runtime.py or assertions.py changes.

Example — DALL-E /v1/images/generations:

# tests/helpers/assertions.py — general contract (image category)
def assert_images_generations_response(resp_body: dict, request_config: dict, *, run_level: str | None = None) -> None:
    ...  # data[], n, size → assert_image_valid

# tests/helpers/runtime.py — general assert INSIDE send
def send_images_generations_request(self, request_config: dict[str, Any], ...) -> list[HttpResponse]:
    responses = self.send_images_generations_http_request(request_config, ...)
    if request_config.get("err_code") is None:
        body = responses[0].json_body
        assert isinstance(body, dict)
        assert_images_generations_response(body, request_config, run_level=self.run_level)
    return responses

# tests/e2e/.../test_foo_expansion.py — one case per test_* (no case_id branching)
@pytest.mark.parametrize("omni_server", [pytest.param(OmniServerParams(model=MODEL), marks=SINGLE_L4)], indirect=True)
def test_foo_images_generations_default_1024(omni_server, online_client) -> None:
    online_client.send_images_generations_request({"json": body, "timeout": 300})

@pytest.mark.parametrize("omni_server", [pytest.param(OmniServerParams(model=MODEL), marks=SINGLE_L4)], indirect=True)
def test_foo_images_generations_sizes_256_512_1024(omni_server, online_client) -> None:
    for size in ("256x256", "512x512", "1024x1024"):
        online_client.send_images_generations_request({"json": {**body, "size": size}, "timeout": 300})

# chat diffusion — separate test; send_diffusion_request bundles assert_diffusion_response
@pytest.mark.parametrize("omni_server", [pytest.param(OmniServerParams(model=MODEL), marks=SINGLE_L4)], indirect=True)
def test_foo_chat_completions_t2i_fallback(omni_server, online_client) -> None:
    online_client.send_diffusion_request({...})

L1 tests under tests/entrypoints/ may keep minimal asserts next to the handler under test when validating a single branch; still prefer assertions.py when the same JSON/media check appears in more than one file or level (e.g. L1 protocol test + L4 e2e).

Omni Test Writing Guidance (L1-L4 Layering)

When the goal is a general Omni/multimodal test case, prioritize mapping the test to the correct purpose, directory, and resource assumptions aligned with the layers (see test_system_overview.md and test_writing_guide.md):

• L1: Unit/logic validation on CPU (core_model and cpu). Cover input validation, branches, and exception paths (tests/<component>/test_*.py). Mock with mocker / monkeypatch only — not unittest.mock.
• L2: Basic e2e (online/offline basic scenarios). Prefer dummy/lightweight models to validate the end-to-end request-to-output-structure/streaming chain (typically tests/e2e/online_serving/ and tests/e2e/offline_inference/).
• L3/L4: Important integration, performance, and accuracy validation. L4 emphasizes “full functional scenarios + performance/stress + runnable doc examples” (typically *_expansion.py plus related expansion cases).

Also keep markers consistent with the run level: use core_model for L1/L2 and advanced_model for L3/L4, and pair with --run-level to select the intended CI strategy.

Diffusion Test Writing Guidance (L4 Coverage Combinations)

When the task involves diffusion models/features, organize L4 test cases following #1832: combine multiple diffusion features into as few test cases as possible to fit limited CI GPU resources.

Implementation strategy:

1. If “full L4 is too heavy”: first provide a reduced local validation case in L1/L2 (so the key assertion and the contract fix point are covered deterministically).
2. Then provide CI/nightly-ready L3/L4 high-marked cases (e.g. advanced_model) to broaden coverage under resource constraints.

L4 nightly sub-pillars — Function vs Accuracy vs Perf

L4 is not only test_*_expansion.py. In test-nightly.yml, each model-type group typically runs separate jobs:

Sub-pillar	Nightly step label pattern	What you add	Typical paths
Function	· Function Test with …	E2e expansion / feature matrix	tests/e2e/online_serving/test_<model>_expansion.py (or offline)
Accuracy	· Accuracy Test	Quality / similarity vs baseline	tests/e2e/accuracy/test_<model>*.py
Perf	· Perf Test · <Model>	Throughput / latency / memory benchmarks	tests/dfx/perf/tests/test_<model>_vllm_omni.json + runner script
Doc (optional)	· Doc Test	Runnable doc examples	tests/examples/*/test_text_to_image.py, …

Default when the user asks for “L4 functional cases”: deliver Function pillar only (*_expansion.py + Function Test shard in test-nightly.yml). Do not silently add Perf or Accuracy unless the user also asks for performance / benchmark / accuracy / full L4 / full L4 coverage.

When the user explicitly asks for L4 perf (or full L4 including perf):

1. Do not put throughput/latency assertions inside test_*_expansion.py — perf uses the dfx benchmark harness, not omni_server e2e fixtures.
2. Add or extend a JSON config under tests/dfx/perf/tests/ (mirror in-tree names: test_qwen_image_vllm_omni.json, test_cosmos3_vllm_omni.json, test_qwen3_omni_async_chunk.json).
3. Each JSON case: test_name, optional mark (hardware_marks required when present; marks: full_model + omni/tts/diffusion), server_params (model, serve_args or stage_config_name), benchmark_params[] with name and explicit baseline (throughput_qps, latency_mean, peak_memory_mb_mean, …). Diffusion cases also set server_type (e.g. "vllm-omni") and usually benchmark_endpoint.
4. Run locally via the matching script (model type → runner):

Model type	Runner script	Example config
Diffusion X2I/X2V	tests/dfx/perf/scripts/run_diffusion_benchmark.py	tests/dfx/perf/tests/test_qwen_image_vllm_omni.json
TTS	tests/dfx/perf/scripts/run_benchmark.py	tests/dfx/perf/tests/test_tts.json (shared) or test_{slug}.json (dedicated; use when the model must not join the shared nightly matrix before integration — e.g. test_voxcpm2.json, test_coqui_tts.json)
Omni	tests/dfx/perf/scripts/run_benchmark.py	test_qwen3_omni_no_async_chunk.json, test_qwen3_omni_async_chunk.json, test_qwen3_omni_vllm_text.json, test_qwen3_omni_multi_replicas.json

5. Wire test-nightly.yml · Perf Test step for that model (separate from Function Test): export DIFFUSION_BENCHMARK_DIR / BENCHMARK_DIR, run pytest on the script with --test-config-file (nightly perf steps do not use -m), upload artifacts (buildkite-agent artifact upload), often multi-GPU H100 for diffusion perf.
6. One benchmark scenario → one test_name block in JSON (same spirit as one test_* per function case). Combine server serve_args + workload in one entry; use multiple benchmark_params rows for size/step sweeps under the same server config.

Perf local commands:

cd tests
export DIFFUSION_BENCHMARK_DIR=tests/dfx/perf/results
export DIFFUSION_ATTENTION_BACKEND=FLASH_ATTN
# Single file (CI-like)
pytest -s -v dfx/perf/scripts/run_diffusion_benchmark.py \
  --test-config-file dfx/perf/tests/test_<model>_vllm_omni.json
# Bulk load + filter by JSON mark
pytest -sv dfx/perf/scripts/run_diffusion_benchmark.py -m "full_model and diffusion and H100"
pytest -sv dfx/perf/scripts/run_benchmark.py -m "full_model and omni and H100"

Clarify in the test plan which L4 pillars you deliver: Function only | Function + Perf | Function + Accuracy + Perf.

See references/test-routing.md L4 nightly pillars for Buildkite step patterns.

Step 5: Wire Buildkite (when CI must run the new test)

If the test is not already collected by an existing pipeline command (for example, L1 tests marked core_model and cpu are already covered by the Simple Unit Test step in ready/merge), update the appropriate pipeline under .buildkite/:

Test level	Edit this file	Typical trigger / intent
L1 and L2	.buildkite/cuda/test-ready.yml	PR ready label; L1 CPU + L2 GPU/basic e2e (steps labeled Omni ·, TTS ·, Diffusion ·)
L3	.buildkite/cuda/test-merge.yml	Post-merge; advanced_model integration per model type
L4	.buildkite/cuda/test-nightly.yml	Nightly; grouped by model type (see below)
Invalid param / reliability (weekly)	.buildkite/cuda/test-weekly.yml	Weekly; tests/dfx/reliability/invalid_param_test/ — not L1–L4 e2e pipelines

Level-specific Buildkite delivery (follow the user’s requested level):

User asks for	Document / edit only	Do not add by default
L4 (*_expansion.py, full_model)	test-nightly.yml — append file to the matching nightly shard (X2I / X2V / Omni / TTS) or note it is already collected by an existing -m / -k sweep	test-merge.yml (L3 / advanced_model) or test-ready.yml (L2)
L3	test-merge.yml with advanced_model + source_file_dependencies	test-nightly.yml unless user also wants nightly
L2	test-ready.yml with core_model + source_file_dependencies	merge / nightly pipelines
Invalid param	test-weekly.yml — Invalid parameters Test group (-m "slow and H100" / -m "slow and L4"). Usually no YAML edit when appending cases to existing invalid_param_test scripts	test-ready.yml, test-merge.yml, test-nightly.yml

test-nightly.yml shards use explicit pytest file paths in commands (and PR labels like diffusion-x2iat-test); they generally do not use source_file_dependencies. Only suggest merge/ready YAML when the requested level is L3/L2 (or the user explicitly asks for multi-level CI).

test-nightly.yml top-level groups (each uses full_model + type marker in pytest -m):

Group	Type marker	Notes
Omni Model Test	omni	Function / doc / accuracy / perf for Qwen-Omni family
TTS Model Test	tts	-m "full_model and L4 and tts" (and H100 variants when enabled); Perf Test uses run_benchmark.py + test_tts.json
Diffusion X2I(&A&T) Model Test	diffusion	Image/audio/text diffusion; explicit file shards for Function; Perf Test · <Model> uses run_diffusion_benchmark.py + JSON config
Diffusion X2V Model Test	diffusion	Video-only (Wan, HunyuanVideo, …); PR label diffusion-x2v-test; separate Perf steps when in-tree

Guidelines when editing YAML:

• Match markers and --run-level to the test: L1/L2 in test-ready.yml use core_model + omni / tts / diffusion as appropriate; L3 merge uses advanced_model; L4 nightly uses full_model with the same type marker.
• Diffusion L4: add x2i/x2a/x2t expansion files to an X2I(&A&T) step; add x2v expansion files to X2V — never rely on a broad tests/e2e/ sweep alone (shards exist to save GPU and avoid wrong queue).
• source_file_dependencies (required for new E2E jobs in test-ready.yml and test-merge.yml): every step under the :card_index_dividers: E2E Test group must declare source_file_dependencies so Buildkite only schedules the job when relevant paths change. Omitting it breaks path-based CI skipping for GPU e2e jobs.
• Reuse or extend an existing step when the new test shares the same marker expression, queue, and timeout; otherwise add a new steps: entry with the correct agents.queue, timeout_in_minutes, and docker/kubernetes plugin blocks consistent with neighboring jobs.
• Job timeout — use timeout_in_minutes on the step, not timeout before pytest: when adding or documenting a new E2E job in test-ready.yml / test-merge.yml, set timeout_in_minutes on the step and run pytest directly in commands. Do not wrap pytest in timeout 40m bash -c "..." / timeout 20m bash -c "..."; Buildkite already enforces the step deadline via timeout_in_minutes.
• Never omit plugins in skill examples or PR YAML snippets: H100 E2E steps on mithril-h100-pool use the full kubernetes block (resources, volumeMounts, env with HF_TOKEN secret, nodeSelector: gpu-h100-sxm, devshm + volumes). L4/docker steps on use the full block (, , volumes). Do not write — paste the complete block from a sibling step.

source_file_dependencies for E2E Test jobs (test-ready.yml, test-merge.yml)

When adding or splitting a step inside the E2E Test group, always include source_file_dependencies on that step. List paths the job actually depends on — at minimum:

1. Test module(s) — every tests/e2e/... file the pytest command runs (online and offline if both are in one step).
2. Model implementation — vllm_omni/model_executor/models/<family>/ and/or vllm_omni/diffusion/models/<family>/ as applicable.
3. Stage / input plumbing (omni & multi-stage TTS) — vllm_omni/model_executor/stage_input_processors/<family>.py when present.
4. Deploy / stage YAML — vllm_omni/deploy/<config>.yaml or vllm_omni/deploy/ci/<config>.yaml referenced by the test’s OmniServerParams / get_deploy_config_path(...).
5. Test helpers (when changed in the same PR) — tests/helpers/runtime.py for new send_* client methods; tests/helpers/assertions.py for new shared assert_* helpers.

Use repo-relative paths (no leading ./). Prefer directory entries (.../models/bagel/) when the whole package matters; use file entries for single test modules and YAML configs. Mirror a neighboring step for the same model family (e.g. Diffusion · Bagel Test in test-ready.yml).

Example (L2 ready — diffusion online smoke, H100 kubernetes):

- label: "Diffusion · Bagel Test"
  source_file_dependencies:
    - tests/e2e/online_serving/test_bagel.py
    - vllm_omni/model_executor/models/bagel/
    - vllm_omni/diffusion/models/bagel/
    - vllm_omni/model_executor/stage_input_processors/bagel.py
    - vllm_omni/deploy/bagel.yaml
  timeout_in_minutes: 40
  commands:
    - |
      export VLLM_IMAGE_FETCH_TIMEOUT=60
      pytest -s -v tests/e2e/online_serving/test_bagel.py -m 'core_model' --run-level 'core_model'
  agents:
    queue: "mithril-h100-pool"
  plugins:
    - kubernetes:
        podSpec:
          containers:
            - image: 936637512419.dkr.ecr.us-west-2.amazonaws.com/vllm-ci-pull-through-cache/q9t5s3a7/vllm-ci-test-repo:$BUILDKITE_COMMIT
              resources:
                limits:
                  nvidia.com/gpu: 1
              volumeMounts:
                - name: devshm
                  mountPath: /dev/shm
                - name: hf-cache
                  mountPath: /root/.cache/huggingface
              env:
                - name: HF_HOME
                  value: /root/.cache/huggingface
                - name: HF_TOKEN
                  valueFrom:
                    secretKeyRef:
                      name: hf-token-secret
                      key: token
          nodeSelector:
            node.kubernetes.io/instance-type: gpu-h100-sxm
          volumes:
            - name: devshm
              emptyDir:
                medium: Memory
            - name: hf-cache
              hostPath:
                path: /mnt/hf-cache
                type: DirectoryOrCreate

Example (L3 merge — TTS online + offline, L4 docker):

- label: "TTS · Qwen3-TTS Base Test"
  source_file_dependencies:
    - tests/e2e/online_serving/test_qwen3_tts_base.py
    - tests/e2e/offline_inference/test_qwen3_tts_base.py
    - vllm_omni/model_executor/models/qwen3_tts/
    - vllm_omni/model_executor/stage_input_processors/qwen3_tts.py
    - vllm_omni/deploy/qwen3_tts.yaml
  timeout_in_minutes: 20
  commands:
    - |
      export VLLM_LOGGING_LEVEL=DEBUG
      export VLLM_ALLOW_LONG_MAX_MODEL_LEN=1
      pytest -s -v tests/e2e/online_serving/test_qwen3_tts_base.py tests/e2e/offline_inference/test_qwen3_tts_base.py -m 'advanced_model and cuda' --run-level 'advanced_model'
  agents:
    queue: "gpu_1_queue" # g6.4xlarge instance on AWS, has 1 L4 GPU
  plugins:
    - docker#v5.2.0:
        image: public.ecr.aws/q9t5s3a7/vllm-ci-test-repo:$BUILDKITE_COMMIT
        always-pull: true
        propagate-environment: true
        shm-size: "8gb"
        environment:
          - "HF_HOME=/fsx/hf_cache"
        volumes:
          - "/fsx/hf_cache:/fsx/hf_cache"

Example (L3 merge — diffusion online + offline, H100 kubernetes):

- label: "Diffusion · Qwen Image Test"
  source_file_dependencies:
    - tests/e2e/online_serving/test_qwen_image.py
    - tests/e2e/offline_inference/test_qwen_image.py
    - vllm_omni/diffusion/models/qwen_image/
  timeout_in_minutes: 40
  commands:
    - |
      export VLLM_IMAGE_FETCH_TIMEOUT=60
      pytest -s -v \
        tests/e2e/online_serving/test_qwen_image.py \
        tests/e2e/offline_inference/test_qwen_image.py \
        -m 'advanced_model and cuda' --run-level 'advanced_model'
  agents:
    queue: "mithril-h100-pool"
  plugins:
    - kubernetes:
        podSpec:
          containers:
            - image: 936637512419.dkr.ecr.us-west-2.amazonaws.com/vllm-ci-pull-through-cache/q9t5s3a7/vllm-ci-test-repo:$BUILDKITE_COMMIT
              resources:
                limits:
                  nvidia.com/gpu: 1
              volumeMounts:
                - name: devshm
                  mountPath: /dev/shm
                - name: hf-cache
                  mountPath: /root/.cache/huggingface
              env:
                - name: HF_HOME
                  value: /root/.cache/huggingface
                - name: HF_TOKEN
                  valueFrom:
                    secretKeyRef:
                      name: hf-token-secret
                      key: token
          nodeSelector:
            node.kubernetes.io/instance-type: gpu-h100-sxm
          volumes:
            - name: devshm
              emptyDir:
                medium: Memory
            - name: hf-cache
              hostPath:
                path: /mnt/hf-cache
                type: DirectoryOrCreate

When extending an existing E2E step to run an additional test file, append that file (and any new model/deploy paths) to source_file_dependencies on the same step. When authoring a PR, mention the dependency list in the Buildkite change section of your test plan.

L3 / L4: validating Buildkite from a feature branch (cuda/pipeline.yml)

Production behavior is driven by .buildkite/cuda/pipeline.yml: it builds the CI image, then uploads L2 (test-ready.yml on non-main), L3 (test-merge.yml when build.branch == "main"), and L4 (test-nightly.yml when build.env("NIGHTLY") == "1").

When you add or debug L3 or L4 tests and need those child pipelines to run off main or without NIGHTLY=1, apply temporary edits (revert before merge):

1. Point the upload at the right file (optional shortcut)
   In the Upload Ready Pipeline step, the command is buildkite-agent pipeline upload .buildkite/cuda/test-ready.yml. For a one-off run you may change that path to .buildkite/cuda/test-merge.yml (L3) or .buildkite/cuda/test-nightly.yml (L4), and adjust the step’s if: so it does not conflict with the other upload steps (avoid double-uploading unless intentional).

2. L3 — merge pipeline
   The gate if: build.branch == "main" lives on the Upload Merge Pipeline step in cuda/pipeline.yml (not inside test-merge.yml). Comment out that if line so test-merge.yml is uploaded on your feature branch. Alternatively rely on step (1) instead of the dedicated merge upload step.

3. L4 — nightly pipeline
   Comment out if: build.env("NIGHTLY") == "1" on the Upload Nightly Pipeline step in cuda/pipeline.yml so the nightly definition is uploaded without setting the env var.
   Child steps in test-nightly.yml often repeat if: build.env("NIGHTLY") == "1"; comment out those lines on the steps you need to run, otherwise they will still be skipped after upload.

Step 6: Run Tests

Pick one command path:

• Quick local regression (preferred first): single file or file.py::test_name
• CI-like level run: marker expression + --run-level

Full templates live in references/test-routing.md. After authoring tests, always emit concrete commands (see Output Format).

Typical copy-paste examples (run from repo tests/ directory; requires matching vLLM/vllm-omni install and hardware):

Area	Example
Omni offline L2	pytest -s -v e2e/offline_inference/test_qwen2_5_omni.py -m "core_model and omni and not cpu" --run-level=core_model
Omni online L2	pytest -s -v e2e/online_serving/test_qwen3_omni.py -m "core_model and omni" --run-level=core_model
TTS online L2	pytest -s -v e2e/online_serving/test_qwen3_tts_base.py -m "core_model and tts" --run-level=core_model
Diffusion X2I L2 online	pytest -s -v e2e/online_serving/test_qwen_image.py -m "core_model and diffusion" --run-level=core_model
Diffusion X2V L2 online	pytest -s -v e2e/online_serving/test_wan22_t2v.py -m "core_model and diffusion" --run-level=core_model
Diffusion X2I L4 nightly	pytest -s -v e2e/online_serving/test_qwen_image_expansion.py -m "full_model and diffusion and H100" --run-level=full_model
Diffusion X2I L4 perf (nightly)	pytest -s -v dfx/perf/scripts/run_diffusion_benchmark.py --test-config-file dfx/perf/tests/test_qwen_image_vllm_omni.json
Diffusion X2V L4 nightly	pytest -s -v e2e/online_serving/test_wan22_expansion.py -m "full_model and cuda" --run-level=full_model
Invalid param (weekly H100)	pytest -s -v dfx/reliability/invalid_param_test/ -m "slow and H100"
Invalid param (weekly L4)	pytest -s -v dfx/reliability/invalid_param_test/ -m "slow and L4"
L1 CPU	pytest -s -v -m "core_model and cpu"

Prerequisites to mention when relevant: GPU model (e.g. L4 vs H100), HF_HOME / token for hub weights, module-level skipif (NPU/XPU-only gaps), and whether CI already collects the path (e.g. test_*_expansion.py glob in test-nightly.yml).

Step 7: Validate Result Quality

Before finishing:

• Is the new assertion directly tied to the bug/feature contract?
• Are API calls made via runtime.py send_*_request (not inline HTTP/SDK in the test file)?
• Is the general assert_* bundled inside send_*_request (not duplicated in the test)?
• Is each scenario a separate test_* function (no case_id / if param.id branching across cases)?
• Fixture scope: default omni_server / omni_runner (module); _function variants only when each test must restart the instance?
• Is the test deterministic (no fragile timing/network coupling)?
• Is runtime appropriate for the selected level?
• Are markers and --run-level consistent?
• Invalid-param cases in tests/dfx/reliability/invalid_param_test/ (not e2e), using send_*_http_request + err_code, with pytest.mark.slow and correct H100 / L4 hardware mark?

Output Format

When completing a request, return:

1. Test plan (level, markers, file target, L4 pillar(s) if applicable: Function / Accuracy / Perf / Doc; or Invalid param pillar with target invalid_param_test/test_invalid_<area>.py; module basename for e2e: test_{slug}.py / test_{slug}_expansion.py)
2. Generated/updated test file(s) — model-specific constants and request payloads stay inside those test modules (never tests/helpers/{slug}.py). Extend tests/helpers/runtime.py / tests/helpers/assertions.py only when new repo-wide send_* or shared assert helpers are required (do not leave ad-hoc HTTP or _assert_* in test modules). If L4 Perf was requested, also list tests/dfx/perf/tests/*.json. If invalid-param cases were requested, list the invalid_param_test/ script and parametrized test_* / new id= rows — not e2e paths.
3. Buildkite change — match the requested level and pillar:
   • L4 Function: test-nightly.yml Function Test shard (file list / note existing sweep). No test-merge.yml unless user also asked for L3.
   • L4 Perf: test-nightly.yml Perf Test · <Model> step (new step or extend commands); include env exports + artifact upload pattern from a sibling perf job.
   • L4 Accuracy: test-nightly.yml Accuracy Test step under the same model-type group.
   • L3: test-merge.yml + full source_file_dependencies + agents + plugins.
   • L2: test-ready.yml + same E2E block requirements.
   • Invalid param: test-weekly.yml — note Invalid parameters Test · H100/L4 group; usually no YAML change when only extending existing scripts. If the user asked only for , state explicitly that were not included (offer to add if needed). If the plan mixes and , split deliverables across e2e vs and call out both CI files.

Additional Resources

• Marker and command routing: references/test-routing.md
• CI pipelines (vllm-omni): test-ready.yml (L1/L2), test-merge.yml (L3), test-nightly.yml (L4), test-weekly.yml (invalid param / reliability)
• L4 documentation example tests (naming, extraction vs copied scripts, output dirs, skips): docs/contributing/ci/test_examples/l4_doc_example_tests.inc.md — see also PR #1910