Python: Achieve 85%+ unit test coverage for azurefunctions package (#3866)

* Initial plan

* Initial analysis: azurefunctions package at 80% coverage, need 85%

Co-authored-by: larohra <41490930+larohra@users.noreply.github.com>

* Add comprehensive unit tests to achieve 86% coverage for azurefunctions package

Co-authored-by: larohra <41490930+larohra@users.noreply.github.com>

* Add comprehensive coverage report documentation for azurefunctions package

Co-authored-by: larohra <41490930+larohra@users.noreply.github.com>

* Fix linting errors: combine nested with statements in test_entities.py

Co-authored-by: larohra <41490930+larohra@users.noreply.github.com>

* Remove COVERAGE_REPORT.md and coverage.json files as requested

Co-authored-by: larohra <41490930+larohra@users.noreply.github.com>

* Address PR review feedback: fix unused variables, remove line numbers from docstrings, improve test clarity

Co-authored-by: larohra <41490930+larohra@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: larohra <41490930+larohra@users.noreply.github.com>
Co-authored-by: Laveesh Rohra <larohra@microsoft.com>
Co-authored-by: Tao Chen <taochen@microsoft.com>

python/packages/azurefunctions/tests/test_orchestration.py

@@ -129,6 +129,25 @@ def executor_with_context(mock_context_with_uuid: tuple[Mock, str]) -> tuple[Any
 class TestAgentResponseHelpers:
     """Tests for response handling through public AgentTask API."""
 
+    def test_try_set_value_exception_handling(self) -> None:
+        """Test try_set_value handles exceptions raised when converting a successful task result to AgentResponse."""
+        entity_task = _create_entity_task()
+        task = AgentTask(entity_task, None, "correlation-id")
+
+        # Simulate successful entity task with invalid result that causes exception
+        entity_task.state = TaskState.SUCCEEDED
+        entity_task.result = {"invalid": "format"}  # Missing required fields for AgentResponse
+
+        # Clear pending_tasks to simulate that parent has processed the child
+        task.pending_tasks.clear()
+
+        # Call try_set_value - should catch exception and set error
+        task.try_set_value(entity_task)
+
+        # Verify task failed due to conversion exception
+        assert task.state == TaskState.FAILED
+        assert isinstance(task.result, Exception)
+
     def test_try_set_value_success(self) -> None:
         """Test try_set_value correctly processes successful task completion."""
         entity_task = _create_entity_task()
@@ -279,6 +298,27 @@ class TestAzureFunctionsFireAndForget:
         assert isinstance(result, AgentTask)
 
 
+class TestAzureFunctionsAgentExecutor:
+    """Tests for AzureFunctionsAgentExecutor."""
+
+    def test_generate_unique_id(self, mock_context_with_uuid: tuple[Mock, str]) -> None:
+        """Test generate_unique_id method returns UUID from orchestration context."""
+        from agent_framework_azurefunctions._orchestration import AzureFunctionsAgentExecutor
+
+        context, _ = mock_context_with_uuid
+        executor = AzureFunctionsAgentExecutor(context)
+
+        # Call generate_unique_id
+        unique_id = executor.generate_unique_id()
+
+        # Verify it returns the UUID from context (as string with dashes)
+        # The UUID is returned in standard format with dashes
+        context.new_uuid.assert_called_once()
+        # Just verify it's a string representation of UUID
+        assert isinstance(unique_id, str)
+        assert len(unique_id) > 0
+
+
 class TestOrchestrationIntegration:
     """Integration tests for orchestration scenarios."""