test: adding tests for ID Generator and associated classes

tests/server/test_id_generator.py

@@ -0,0 +1,167 @@
+import uuid
+from unittest.mock import patch
+
+import pytest
+
+from a2a.server.id_generator import IDGeneratorContext, IDGenerator, UUIDGenerator
+
+
+class TestIDGeneratorContext:
+    """Tests for IDGeneratorContext."""
+
+    def test_context_creation_with_all_fields(self):
+        """Test creating context with all fields populated."""
+        context = IDGeneratorContext(task_id="task_123", context_id="context_456")
+        assert context.task_id == "task_123"
+        assert context.context_id == "context_456"
+
+    def test_context_creation_with_defaults(self):
+        """Test creating context with default None values."""
+        context = IDGeneratorContext()
+        assert context.task_id is None
+        assert context.context_id is None
+
+    def test_context_creation_with_partial_fields(self):
+        """Test creating context with only some fields populated."""
+        context = IDGeneratorContext(task_id="task_123")
+        assert context.task_id == "task_123"
+        assert context.context_id is None
+
+    def test_context_mutability(self):
+        """Test that context fields can be updated (Pydantic models are mutable by default)."""
+        context = IDGeneratorContext(task_id="task_123")
+        context.task_id = "task_456"
+        assert context.task_id == "task_456"
+
+    def test_context_validation(self):
+        """Test that context validates field types."""
+        context = IDGeneratorContext(task_id="valid_string")
+        assert isinstance(context.task_id, str)
+
+
+class TestIDGenerator:
+    """Tests for IDGenerator abstract base class."""
+
+    def test_cannot_instantiate_abstract_class(self):
+        """Test that IDGenerator cannot be instantiated directly."""
+        with pytest.raises(TypeError):
+            IDGenerator() # noqa
+
+    def test_subclass_must_implement_generate(self):
+        """Test that subclasses must implement the generate method."""
+
+        class IncompleteGenerator(IDGenerator): # noqa
+            pass
+
+        with pytest.raises(TypeError):
+            IncompleteGenerator() # noqa
+
+    def test_valid_subclass_implementation(self):
+        """Test that a valid subclass can be instantiated."""
+
+        class ValidGenerator(IDGenerator):
+            def generate(self, context: IDGeneratorContext) -> str:
+                return "test_id"
+
+        generator = ValidGenerator()
+        assert generator.generate(IDGeneratorContext()) == "test_id"
+
+
+class TestUUIDGenerator:
+    """Tests for UUIDGenerator implementation."""
+
+    def test_generate_returns_string(self):
+        """Test that generate returns a string."""
+        generator = UUIDGenerator()
+        context = IDGeneratorContext()
+        result = generator.generate(context)
+        assert isinstance(result, str)
+
+    def test_generate_returns_valid_uuid(self):
+        """Test that generate returns a valid UUID format."""
+        generator = UUIDGenerator()
+        context = IDGeneratorContext()
+        result = generator.generate(context)
+
+        # This should not raise an exception if result is a valid UUID
+        uuid.UUID(result)
+
+    def test_generate_returns_uuid_version_4(self):
+        """Test that generate returns a UUID version 4."""
+        generator = UUIDGenerator()
+        context = IDGeneratorContext()
+        result = generator.generate(context)
+
+        parsed_uuid = uuid.UUID(result)
+        assert parsed_uuid.version == 4
+
+    def test_generate_ignores_context(self):
+        """Test that generate ignores the context parameter."""
+        generator = UUIDGenerator()
+        context1 = IDGeneratorContext(task_id="task_1", context_id="context_1")
+        context2 = IDGeneratorContext(task_id="task_2", context_id="context_2")
+
+        result1 = generator.generate(context1)
+        result2 = generator.generate(context2)
+
+        # Both should be valid UUIDs but different
+        uuid.UUID(result1)
+        uuid.UUID(result2)
+        assert result1 != result2
+
+    def test_generate_produces_unique_ids(self):
+        """Test that multiple calls produce unique IDs."""
+        generator = UUIDGenerator()
+        context = IDGeneratorContext()
+
+        ids = [generator.generate(context) for _ in range(100)]
+
+        # All IDs should be unique
+        assert len(ids) == len(set(ids))
+
+    def test_generate_with_empty_context(self):
+        """Test that generate works with an empty context."""
+        generator = UUIDGenerator()
+        context = IDGeneratorContext()
+        result = generator.generate(context)
+
+        assert isinstance(result, str)
+        uuid.UUID(result)
+
+    def test_generate_with_populated_context(self):
+        """Test that generate works with a populated context."""
+        generator = UUIDGenerator()
+        context = IDGeneratorContext(task_id="task_123", context_id="context_456")
+        result = generator.generate(context)
+
+        assert isinstance(result, str)
+        uuid.UUID(result)
+
+    @patch('uuid.uuid4')
+    def test_generate_calls_uuid4(self, mock_uuid4):
+        """Test that generate uses uuid.uuid4() internally."""
+        mock_uuid = uuid.UUID('12345678-1234-5678-1234-567812345678')
+        mock_uuid4.return_value = mock_uuid
+
+        generator = UUIDGenerator()
+        context = IDGeneratorContext()
+        result = generator.generate(context)
+
+        mock_uuid4.assert_called_once()
+        assert result == str(mock_uuid)
+
+    def test_generator_is_instance_of_id_generator(self):
+        """Test that UUIDGenerator is an instance of IDGenerator."""
+        generator = UUIDGenerator()
+        assert isinstance(generator, IDGenerator)
+
+    def test_multiple_generators_produce_different_ids(self):
+        """Test that multiple generator instances produce different IDs."""
+        generator1 = UUIDGenerator()
+        generator2 = UUIDGenerator()
+        context = IDGeneratorContext()
+
+        result1 = generator1.generate(context)
+        result2 = generator2.generate(context)
+
+        assert result1 != result2