CTA Architecture & Framework 2 — Questions and Answers
Question 1: Which TestStand architecture component is responsible for routing test results to multiple output destinations simultaneously?
- Result Collector
- Result Listener (Correct answer)
- Result Processor
- Result Dispatcher
Correct answer: Result Listener
Result Listeners are plug-in components that receive test results and can route them to databases, reports, or custom destinations simultaneously.
Question 2: In a TestStand parallel model, what is the primary role of the TestSocket?
- It defines the test sequence execution order
- It represents an independent thread of execution with its own UUT (Correct answer)
- It manages synchronization between multiple stations
- It stores shared variables across all parallel threads
Correct answer: It represents an independent thread of execution with its own UUT
A TestSocket represents a single independent thread of execution associated with one Unit Under Test (UUT) in a parallel testing model.
Question 3: What is the correct way to make a type-safe call to a step type's custom properties in TestStand code modules?
- Access them directly via the Step object's PropertyObject (Correct answer)
- Use the StepPropertySet API with explicit type casting
- Access them through the Step.AsPropertyObject method with type-safe getters
- Use TypeDescriptor binding to access step properties at compile time
Correct answer: Access them directly via the Step object's PropertyObject
Custom step properties are accessed via the Step's underlying PropertyObject using typed Get/Set methods to ensure type safety.
Question 4: When designing a custom process model, which callback sequence is invoked once per test session regardless of how many UUTs are tested?
- TestUUT
- PreUUT
- MainSequence
- TestSocketSetup (Correct answer)
Correct answer: TestSocketSetup
TestSocketSetup runs once per test socket when the test session begins, initializing resources shared across all UUT tests on that socket.
Question 5: Which TestStand feature allows you to share a single instrument driver instance across multiple parallel test sockets?
- Station Globals
- Shared Variables
- Station Computer Interface (SCI)
- Resource Locking with the Synchronization Step (Correct answer)
Correct answer: Resource Locking with the Synchronization Step
Resource Locking via Synchronization steps controls exclusive access to shared instruments across parallel sockets, preventing simultaneous conflicting access.
Question 6: In TestStand's sequence file architecture, what distinguishes a sequence file's 'Locals' from 'Parameters'?
- Locals persist between calls; Parameters do not
- Parameters are passed from the caller; Locals are internal to the sequence (Correct answer)
- Locals are shared across all sequences in a file; Parameters are sequence-specific
- Parameters support more data types than Locals
Correct answer: Parameters are passed from the caller; Locals are internal to the sequence
Parameters are values passed into a sequence by its caller, while Locals are variables declared within the sequence and not visible to callers.
Question 7: Which architectural pattern does TestStand's process model use to allow customization without modifying the core engine?
- Decorator Pattern
- Template Method Pattern (Correct answer)
- Strategy Pattern
- Observer Pattern
Correct answer: Template Method Pattern
The Template Method Pattern defines the skeleton of the test flow in the process model, with specific callback sequences as extension points for customization.
CTA Architecture & Framework 2
Which TestStand architecture component is responsible for routing test results to multiple output destinations simultaneously?