chore: import upstream snapshot with attribution

tests/python/support/test_auto_target.py

@@ -0,0 +1,37 @@
+import pytest
+from tvm.target import Target
+
+from mlc_llm.support.auto_target import _apply_webgpu_subgroups
+
+# test category "unittest"
+pytestmark = [pytest.mark.unittest]
+
+
+def test_apply_webgpu_subgroups_enables_webgpu_target():
+    target = Target("webgpu")
+
+    updated = _apply_webgpu_subgroups(target, True)
+
+    assert updated is not target
+    assert dict(target.export())["supports_subgroups"] is False
+    assert dict(updated.export())["supports_subgroups"] is True
+
+
+def test_apply_webgpu_subgroups_non_webgpu_target_is_unchanged():
+    target = Target("llvm")
+
+    updated = _apply_webgpu_subgroups(target, True)
+
+    assert updated is target
+    assert dict(updated.export()) == dict(target.export())
+
+
+@pytest.mark.parametrize("target_kind", ["webgpu", "llvm"])
+@pytest.mark.parametrize("enable_subgroups", [False, None])
+def test_apply_webgpu_subgroups_disabled_is_unchanged(target_kind, enable_subgroups):
+    target = Target(target_kind)
+
+    updated = _apply_webgpu_subgroups(target, enable_subgroups)
+
+    assert updated is target
+    assert dict(updated.export()) == dict(target.export())