[Misc] Simplify `test_argsort_mm_positions` (#25690)

Signed-off-by: DarkLight1337 <tlleungac@connect.ust.hk>

tests/multimodal/test_utils.py

@@ -5,7 +5,6 @@ import base64
 import mimetypes
 import os
 from tempfile import NamedTemporaryFile, TemporaryDirectory
-from typing import TYPE_CHECKING, NamedTuple
 
 import numpy as np
 import pytest
@@ -15,9 +14,6 @@ from vllm.multimodal.image import convert_image_mode
 from vllm.multimodal.inputs import PlaceholderRange
 from vllm.multimodal.utils import MediaConnector, argsort_mm_positions
 
-if TYPE_CHECKING:
-    from vllm.multimodal.inputs import MultiModalPlaceholderDict
-
 # Test different image extensions (JPG/PNG) and formats (gray/RGB/RGBA)
 TEST_IMAGE_ASSETS = [
     "2560px-Gfp-wisconsin-madison-the-nature-boardwalk.jpg",  # "https://upload.wikimedia.org/wikipedia/commons/thumb/d/dd/Gfp-wisconsin-madison-the-nature-boardwalk.jpg/2560px-Gfp-wisconsin-madison-the-nature-boardwalk.jpg"
@@ -218,18 +214,13 @@ async def test_fetch_video_http_with_dynamic_loader(
         assert metadata_sync["video_backend"] == "opencv_dynamic"
 
 
-# Used for `test_argsort_mm_positions`.
-class TestCase(NamedTuple):
-    mm_positions: "MultiModalPlaceholderDict"
-    expected_modality_idxs: list[tuple[str, int]]
-
-
-def test_argsort_mm_positions():
-
-    test_cases = [
+# yapf: disable
+@pytest.mark.parametrize(
+    "case",
+    [
         # Single modality
         ## Internally sorted
-        TestCase(
+        dict(
             mm_positions={
                 "image": [
                     PlaceholderRange(offset=0, length=2),
@@ -242,7 +233,7 @@ def test_argsort_mm_positions():
             ],
         ),
         ## Internally unsorted
-        TestCase(
+        dict(
             mm_positions={
                 "image": [
                     PlaceholderRange(offset=3, length=2),
@@ -257,7 +248,7 @@ def test_argsort_mm_positions():
 
         # Two modalities
         ## Internally sorted
-        TestCase(
+        dict(
             mm_positions={
                 "image": [
                     PlaceholderRange(offset=7, length=4),
@@ -276,7 +267,7 @@ def test_argsort_mm_positions():
             ],
         ),
         ## Interleaved, internally sorted
-        TestCase(
+        dict(
             mm_positions={
                 "image": [
                     PlaceholderRange(offset=0, length=4),
@@ -295,7 +286,7 @@ def test_argsort_mm_positions():
             ],
         ),
         ## Interleaved, internally unsorted
-        TestCase(
+        dict(
             mm_positions={
                 "image": [
                     PlaceholderRange(offset=8, length=2),
@@ -316,7 +307,7 @@ def test_argsort_mm_positions():
 
         # Three modalities
         ## Internally sorted
-        TestCase(
+        dict(
             mm_positions={
                 "image": [
                     PlaceholderRange(offset=15, length=7),
@@ -341,7 +332,7 @@ def test_argsort_mm_positions():
             ],
         ),
         ## Interleaved, internally sorted
-        TestCase(
+        dict(
             mm_positions={
                 "image": [
                     PlaceholderRange(offset=0, length=2),
@@ -363,8 +354,8 @@ def test_argsort_mm_positions():
                 ("image", 2),
             ],
         ),
-        ## Interleaved, internally sunorted
-        TestCase(
+        ## Interleaved, internally unsorted
+        dict(
             mm_positions={
                 "image": [
                     PlaceholderRange(offset=0, length=2),
@@ -386,9 +377,13 @@ def test_argsort_mm_positions():
                 ("image", 1),
             ],
         ),
-    ]
+    ],
+)
+# yapf: enable
+def test_argsort_mm_positions(case):
+    mm_positions = case["mm_positions"]
+    expected_modality_idxs = case["expected_modality_idxs"]
 
-    for mm_positions, expected_modality_idxs in test_cases:
     modality_idxs = argsort_mm_positions(mm_positions)
 
     assert modality_idxs == expected_modality_idxs