test(responses): responses API Response object unit tests

tests/unit/apis/responses/test_tools.py

@@ -0,0 +1,99 @@
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+# All rights reserved.
+#
+# This source code is licensed under the terms described in the LICENSE file in
+# the root directory of this source tree.
+
+import pytest
+from pydantic import TypeAdapter, ValidationError
+
+from llama_stack.apis.agents.openai_responses import OpenAIResponsesToolChoice
+from llama_stack.apis.tools.openai_tool_choice import (
+    ToolChoiceAllowed,
+    ToolChoiceCustom,
+    ToolChoiceFunction,
+    ToolChoiceMcp,
+    ToolChoiceOptions,
+    ToolChoiceTypes,
+)
+
+
+def test_tool_choice_discriminated_options():
+    adapter = TypeAdapter(OpenAIResponsesToolChoice)
+
+    cases = [
+        ({"type": "function", "name": "search"}, ToolChoiceFunction, "function"),
+        ({"type": "mcp", "server_label": "deepwiki"}, ToolChoiceMcp, "mcp"),
+        ({"type": "custom", "name": "my_tool"}, ToolChoiceCustom, "custom"),
+        (
+            {
+                "type": "allowed_tools",
+                "mode": "auto",
+                "tools": [{"type": "function", "name": "foo"}],
+            },
+            ToolChoiceAllowed,
+            "allowed_tools",
+        ),
+    ]
+
+    for payload, expected_cls, expected_type in cases:
+        obj = adapter.validate_python(payload)
+        assert isinstance(obj, expected_cls)
+        assert obj.type == expected_type
+
+        dumped = obj.model_dump()
+        reparsed = adapter.validate_python(dumped)
+        assert isinstance(reparsed, expected_cls)
+        assert reparsed.model_dump() == dumped
+
+
+def test_tool_choice_literal_options():
+    adapter = TypeAdapter(OpenAIResponsesToolChoice)
+    options_adapter = TypeAdapter(ToolChoiceOptions)
+
+    for v in ("none", "auto", "required"):
+        # Validate via the specific literal adapter
+        assert options_adapter.validate_python(v) == v
+        # And via the top-level union adapter
+        assert adapter.validate_python(v) == v
+
+
+def test_tool_choice_rejects_invalid_value():
+    adapter = TypeAdapter(OpenAIResponsesToolChoice)
+
+    with pytest.raises(ValidationError):
+        adapter.validate_python("invalid")
+    with pytest.raises(ValidationError):
+        adapter.validate_python({"type": "unknown_variant"})
+
+
+def test_tool_choice_types_accepts_each_variant_value():
+    adapter = TypeAdapter(OpenAIResponsesToolChoice)
+
+    allowed_values = [
+        "file_search",
+        "web_search_preview",
+        "computer_use_preview",
+        "web_search_preview_2025_03_11",
+        "image_generation",
+        "code_interpreter",
+    ]
+
+    for v in allowed_values:
+        obj = adapter.validate_python({"type": v})
+        assert isinstance(obj, ToolChoiceTypes)
+        assert obj.type == v
+        assert obj.model_dump() == {"type": v}
+
+
+def test_tool_choice_rejects_invalid_discriminator_value():
+    adapter = TypeAdapter(OpenAIResponsesToolChoice)
+    with pytest.raises(ValidationError):
+        adapter.validate_python({"type": "unknown_variant"})
+
+
+def test_tool_choice_rejects_missing_required_fields():
+    adapter = TypeAdapter(OpenAIResponsesToolChoice)
+    # Missing "name" for function
+    with pytest.raises(ValidationError):
+        adapter.validate_python({"type": "function"})

tests/unit/openapi_typing/test_schema_literals.py

@@ -0,0 +1,33 @@
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+# All rights reserved.
+#
+# This source code is licensed under the terms described in the LICENSE file in
+# the root directory of this source tree.
+
+from typing import Literal
+
+import pytest
+
+from llama_stack.strong_typing.schema import JsonSchemaGenerator
+
+
+def test_single_literal_generates_const_schema():
+    gen = JsonSchemaGenerator()
+    schema = gen.type_to_schema(Literal["hello"])  # type: ignore[valid-type]
+
+    assert schema["const"] == "hello"
+    assert schema["type"] == "string"
+
+
+def test_multi_literal_generates_enum_schema():
+    gen = JsonSchemaGenerator()
+    schema = gen.type_to_schema(Literal["a", "b", "c"])  # type: ignore[valid-type]
+
+    assert schema["enum"] == ["a", "b", "c"]
+    assert schema["type"] == "string"
+
+
+def test_mixed_type_literal_raises():
+    gen = JsonSchemaGenerator()
+    with pytest.raises((ValueError, TypeError)):
+        _ = gen.type_to_schema(Literal["x", 1])  # type: ignore[valid-type]

tests/unit/providers/agents/meta_reference/test_openai_responses.py

@@ -868,3 +868,20 @@ async def test_create_openai_response_with_invalid_text_format(openai_responses_
             model=model,
             text=OpenAIResponseText(format={"type": "invalid"}),
         )
+
+
+def test_openai_response_text_default_format_unique_instance():
+    a = OpenAIResponseText()
+    b = OpenAIResponseText()
+
+    assert a.format is not None
+    assert b.format is not None
+
+    # Defaults to text format
+    assert a.format.get("type") == "text"
+    assert b.format.get("type") == "text"
+
+    # Unique instances (no shared mutable default)
+    assert a.format is not b.format
+    a.format["name"] = "custom-name"
+    assert "name" not in b.format