diff --git a/.chronus/changes/copilot-add-test-case-http-client-python-2026-0-15-4-53-44.md b/.chronus/changes/copilot-add-test-case-http-client-python-2026-0-15-4-53-44.md
new file mode 100644
index 00000000000..6ea9b8d973e
--- /dev/null
+++ b/.chronus/changes/copilot-add-test-case-http-client-python-2026-0-15-4-53-44.md
@@ -0,0 +1,7 @@
+---
+changeKind: internal
+packages:
+  - "@typespec/http-client-python"
+---
+
+Add test case
\ No newline at end of file
diff --git a/packages/http-client-python/generator/test/azure/mock_api_tests/asynctests/test_special_words_async.py b/packages/http-client-python/generator/test/azure/mock_api_tests/asynctests/test_special_words_async.py
index bc7018ecb19..9f22c8c5d15 100644
--- a/packages/http-client-python/generator/test/azure/mock_api_tests/asynctests/test_special_words_async.py
+++ b/packages/http-client-python/generator/test/azure/mock_api_tests/asynctests/test_special_words_async.py
@@ -58,3 +58,8 @@ async def test_model_properties_dict_methods(client: SpecialWordsClient):
             copy_property="ok",
         )
     )
+
+
+@pytest.mark.asyncio
+async def test_model_properties_with_list(client: SpecialWordsClient):
+    await client.model_properties.with_list(models.ModelWithList(list="ok"))
diff --git a/packages/http-client-python/generator/test/azure/mock_api_tests/test_special_words.py b/packages/http-client-python/generator/test/azure/mock_api_tests/test_special_words.py
index 7672f9cd5d5..cc083c94c0e 100644
--- a/packages/http-client-python/generator/test/azure/mock_api_tests/test_special_words.py
+++ b/packages/http-client-python/generator/test/azure/mock_api_tests/test_special_words.py
@@ -52,3 +52,7 @@ def test_model_properties_dict_methods(client: SpecialWordsClient):
             copy_property="ok",
         )
     )
+
+
+def test_model_properties_with_list(client: SpecialWordsClient):
+    client.model_properties.with_list(models.ModelWithList(list="ok"))
diff --git a/packages/http-client-python/generator/test/generic_mock_api_tests/asynctests/test_specs_documentation_async.py b/packages/http-client-python/generator/test/generic_mock_api_tests/asynctests/test_specs_documentation_async.py
index a5abf91c3dd..12e4cb2e5a2 100644
--- a/packages/http-client-python/generator/test/generic_mock_api_tests/asynctests/test_specs_documentation_async.py
+++ b/packages/http-client-python/generator/test/generic_mock_api_tests/asynctests/test_specs_documentation_async.py
@@ -22,11 +22,10 @@ async def test_bullet_points_op(self, client: DocumentationClient):
         # Expected: 204 No Content
         await client.lists.bullet_points_op()
 
-    @pytest.mark.skip(reason="https://github.com/microsoft/typespec/issues/9173")
     @pytest.mark.asyncio
     async def test_bullet_points_model(self, client: DocumentationClient):
         # POST /documentation/lists/bullet-points/model
-        # Expected request body: {"prop": "Simple"}
+        # Expected request body: {"input": {"prop": "Simple"}}
         # Expected: 200 OK
         await client.lists.bullet_points_model(input=models.BulletPointsModel(prop="Simple"))
 
diff --git a/packages/http-client-python/generator/test/generic_mock_api_tests/test_specs_documentation.py b/packages/http-client-python/generator/test/generic_mock_api_tests/test_specs_documentation.py
index 7d7a8cfefa8..2f956dd75fd 100644
--- a/packages/http-client-python/generator/test/generic_mock_api_tests/test_specs_documentation.py
+++ b/packages/http-client-python/generator/test/generic_mock_api_tests/test_specs_documentation.py
@@ -20,7 +20,6 @@ def test_bullet_points_op(self, client: DocumentationClient):
         # Expected: 204 No Content
         client.lists.bullet_points_op()
 
-    @pytest.mark.skip(reason="https://github.com/microsoft/typespec/issues/9173")
     def test_bullet_points_model(self, client: DocumentationClient):
         # POST /documentation/lists/bullet-points/model
         # Expected: 200 OK
diff --git a/packages/http-client-python/generator/test/unbranded/mock_api_tests/asynctests/test_special_words_async.py b/packages/http-client-python/generator/test/unbranded/mock_api_tests/asynctests/test_special_words_async.py
index c565a9ce546..eb11843ab32 100644
--- a/packages/http-client-python/generator/test/unbranded/mock_api_tests/asynctests/test_special_words_async.py
+++ b/packages/http-client-python/generator/test/unbranded/mock_api_tests/asynctests/test_special_words_async.py
@@ -41,3 +41,26 @@ async def test_model(client: SpecialWordsClient, special_words):
 @pytest.mark.asyncio
 async def test_model_properties(client: SpecialWordsClient):
     await client.model_properties.same_as_model(model_properties_models.SameAsModel(same_as_model="ok"))
+
+
+@pytest.mark.asyncio
+async def test_model_properties_dict_methods(client: SpecialWordsClient):
+    await client.model_properties.dict_methods(
+        body=model_properties_models.DictMethods(
+            keys_property="ok",
+            items_property="ok",
+            values_property="ok",
+            popitem_property="ok",
+            clear_property="ok",
+            update_property="ok",
+            setdefault_property="ok",
+            pop_property="ok",
+            get_property="ok",
+            copy_property="ok",
+        )
+    )
+
+
+@pytest.mark.asyncio
+async def test_model_properties_with_list(client: SpecialWordsClient):
+    await client.model_properties.with_list(model_properties_models.ModelWithList(list="ok"))
diff --git a/packages/http-client-python/generator/test/unbranded/mock_api_tests/test_special_words.py b/packages/http-client-python/generator/test/unbranded/mock_api_tests/test_special_words.py
index 6fb680e17e3..89679bfd788 100644
--- a/packages/http-client-python/generator/test/unbranded/mock_api_tests/test_special_words.py
+++ b/packages/http-client-python/generator/test/unbranded/mock_api_tests/test_special_words.py
@@ -37,3 +37,24 @@ def test_model(client: SpecialWordsClient, special_words):
 
 def test_model_properties(client: SpecialWordsClient):
     client.model_properties.same_as_model(model_properties_models.SameAsModel(same_as_model="ok"))
+
+
+def test_model_properties_dict_methods(client: SpecialWordsClient):
+    client.model_properties.dict_methods(
+        body=model_properties_models.DictMethods(
+            keys_property="ok",
+            items_property="ok",
+            values_property="ok",
+            popitem_property="ok",
+            clear_property="ok",
+            update_property="ok",
+            setdefault_property="ok",
+            pop_property="ok",
+            get_property="ok",
+            copy_property="ok",
+        )
+    )
+
+
+def test_model_properties_with_list(client: SpecialWordsClient):
+    client.model_properties.with_list(model_properties_models.ModelWithList(list="ok"))
diff --git a/packages/http-client-python/generator/test/unittests/test_model_base_serialization.py b/packages/http-client-python/generator/test/unittests/test_model_base_serialization.py
index d9027bee195..8e37a85f177 100644
--- a/packages/http-client-python/generator/test/unittests/test_model_base_serialization.py
+++ b/packages/http-client-python/generator/test/unittests/test_model_base_serialization.py
@@ -64,6 +64,22 @@ def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
 
 
+class ModelWithArgsProperty(Model):
+    """A model that has a property named 'args' to test potential conflicts with *args."""
+
+    name: str = rest_field()
+    args: list[str] = rest_field()  # property named 'args' which could conflict with *args
+
+    @overload
+    def __init__(self, *, name: str, args: list[str]): ...
+
+    @overload
+    def __init__(self, mapping: Mapping[str, Any], /): ...
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+
+
 class Pet(Model):
     name: str = rest_field()  # my name
     species: str = rest_field()  # my species
@@ -106,6 +122,43 @@ def test_model_and_dict_equal():
     assert model.virtual_machines == model["virtualMachines"] == dict_response["virtualMachines"]
 
 
+def test_model_with_args_property():
+    """Test that a model with a property named 'args' works correctly."""
+    # Test initialization with keyword arguments
+    model = ModelWithArgsProperty(name="test", args=["arg1", "arg2", "arg3"])
+    assert model.name == "test"
+    assert model.args == ["arg1", "arg2", "arg3"]
+
+    # Test dict-style access
+    assert model["name"] == "test"
+    assert model["args"] == ["arg1", "arg2", "arg3"]
+
+    # Test equality with dict
+    dict_response = {"name": "test", "args": ["arg1", "arg2", "arg3"]}
+    assert model == dict_response
+
+    # Test initialization from dict (using positional argument which goes to *args)
+    model_from_dict = ModelWithArgsProperty(dict_response)
+    assert model_from_dict.name == "test"
+    assert model_from_dict.args == ["arg1", "arg2", "arg3"]
+    assert model_from_dict == model
+
+    # Test modification of the 'args' property
+    model.args = ["new_arg"]
+    assert model.args == ["new_arg"]
+    assert model["args"] == ["new_arg"]
+
+    # Test dict-style modification of 'args'
+    model["args"] = ["modified_arg1", "modified_arg2"]
+    assert model.args == ["modified_arg1", "modified_arg2"]
+
+    # Test JSON serialization roundtrip
+    json_str = json.dumps(dict(model))
+    parsed = json.loads(json_str)
+    assert parsed["name"] == "test"
+    assert parsed["args"] == ["modified_arg1", "modified_arg2"]
+
+
 def test_json_roundtrip():
     dict_response = {
         "platformUpdateDomainCount": 5,
diff --git a/packages/http-client-python/package-lock.json b/packages/http-client-python/package-lock.json
index c804694c65e..1fc2eff24cb 100644
--- a/packages/http-client-python/package-lock.json
+++ b/packages/http-client-python/package-lock.json
@@ -29,7 +29,7 @@
         "@typespec/compiler": "^1.8.0",
         "@typespec/events": "~0.78.0",
         "@typespec/http": "^1.8.0",
-        "@typespec/http-specs": "0.1.0-alpha.30",
+        "@typespec/http-specs": "0.1.0-alpha.31",
         "@typespec/openapi": "^1.8.0",
         "@typespec/rest": "~0.78.0",
         "@typespec/spec-api": "0.1.0-alpha.12",
@@ -2318,9 +2318,9 @@
       }
     },
     "node_modules/@typespec/http-specs": {
-      "version": "0.1.0-alpha.30",
-      "resolved": "https://registry.npmjs.org/@typespec/http-specs/-/http-specs-0.1.0-alpha.30.tgz",
-      "integrity": "sha512-9c/npRHmX+IL4iAuXcDw5Jyy/exTu7IEp4i+JxYj43e+/g8gzFKFRMtJhcrH2xaABMFtrDW5oxXz0mh8PJaIjg==",
+      "version": "0.1.0-alpha.31",
+      "resolved": "https://registry.npmjs.org/@typespec/http-specs/-/http-specs-0.1.0-alpha.31.tgz",
+      "integrity": "sha512-ji+Zt4wB8NnVw3cFiE+LmkXCTfBWEq1xwBQrxJ83q28NQeKBMOVxynjiCz344gxOCcEfhAX4mwKcYeJUKAFVYQ==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
diff --git a/packages/http-client-python/package.json b/packages/http-client-python/package.json
index 857195f588f..3a14ca246a4 100644
--- a/packages/http-client-python/package.json
+++ b/packages/http-client-python/package.json
@@ -94,7 +94,7 @@
     "@typespec/sse": "~0.78.0",
     "@typespec/streams": "~0.78.0",
     "@typespec/xml": "~0.78.0",
-    "@typespec/http-specs": "0.1.0-alpha.30",
+    "@typespec/http-specs": "0.1.0-alpha.31",
     "@types/js-yaml": "~4.0.5",
     "@types/node": "~24.1.0",
     "@types/semver": "7.5.8",