[python] Add mock API tests for AlternateInitialVerb POST pagination scenario

.chronus/changes/add-test-alternate-initial-verb-post-2026-3-18-22-38-49.md

@@ -0,0 +1,7 @@
+---
+changeKind: internal
+packages:
+  - "@typespec/http-client-python"
+---
+
+Add mock API test case for the `AlternateInitialVerb` POST pagination scenario where the initial request uses POST with a filter body and subsequent next link requests use GET.

packages/http-client-python/generator/test/generic_mock_api_tests/asynctests/test_payload_pageable_async.py

@@ -5,6 +5,7 @@
 # --------------------------------------------------------------------------
 import pytest
 from payload.pageable.aio import PageableClient
+from payload.pageable.serverdrivenpagination.alternateinitialverb.models import Filter
 
 
 @pytest.fixture
@@ -125,3 +126,9 @@ async def test_xml_pagination_list_with_continuation(client: PageableClient):
 async def test_xml_pagination_list_with_next_link(client: PageableClient):
     result = [p async for p in client.xml_pagination.list_with_next_link()]
     assert_result(result)
+
+
+@pytest.mark.asyncio
+async def test_alternate_initial_verb_post(client: PageableClient):
+    result = [p async for p in client.server_driven_pagination.alternate_initial_verb.post(Filter(filter="foo eq bar"))]
+    assert_result(result)

packages/http-client-python/generator/test/generic_mock_api_tests/test_payload_pageable.py

@@ -5,6 +5,7 @@
 # --------------------------------------------------------------------------
 import pytest
 from payload.pageable import PageableClient
+from payload.pageable.serverdrivenpagination.alternateinitialverb.models import Filter
 
 
 @pytest.fixture
@@ -91,3 +92,8 @@ def test_xml_pagination_list_with_continuation(client: PageableClient):
 def test_xml_pagination_list_with_next_link(client: PageableClient):
     result = list(client.xml_pagination.list_with_next_link())
     assert_result(result)
+
+
+def test_alternate_initial_verb_post(client: PageableClient):
+    result = list(client.server_driven_pagination.alternate_initial_verb.post(Filter(filter="foo eq bar")))
+    assert_result(result)

packages/http-client-python/package.json

@@ -94,7 +94,7 @@
     "@typespec/sse": "~0.80.0",
     "@typespec/streams": "~0.80.0",
     "@typespec/xml": "~0.80.0",
-    "@typespec/http-specs": "0.1.0-alpha.35-dev.1",
+    "@typespec/http-specs": "0.1.0-alpha.35-dev.4",
     "@types/js-yaml": "~4.0.5",
     "@types/node": "~25.0.2",
     "@types/semver": "7.5.8",