Microsoft QA Engineer System Design Questions

In the cloud context of Microsoft Azure, orchestrating load tests is crucial for scaling applications effectively. Your task is to design a LoadTestOrchestrator that can distribute load across multiple services in a controlled manner.
Problem statement: Create a class LoadTestOrchestrator that can manage multiple load test execution requests and dynamically distribute them to different services based on load balancing strategies.
- Class structure:
- def addTestRequest(serviceName: str, load: int) -> None: : Queues a load test request for execution with a specified load.
- def executeTests() -> None: : Executes all queued load test requests and returns test results.Example 1:
Input: orchestrator = LoadTestOrchestrator(); orchestrator.addTestRequest('serviceA', 50); orchestrator.addTestRequest('serviceB', 70); orchestrator.executeTests()
Output: Example results showing load distribution across services.
Explanation: The orchestrator should balance the load during execution.Constraints:
- 1 <= serviceName.length <= 100
- 1 <= load <= 1000.

To maintain the reliability of Microsoft Teams, you need a system that can identify flaky tests that yield inconsistent results over time. Your task is to design a FlakyTestDetector that monitors test results and flags tests that exhibit flaky behavior.
Problem statement: Design a class FlakyTestDetector containing methods to add test results and identify flaky tests based on a threshold of allowed failures.
- Class structure:
- def addTestResult(testName: str, result: str) -> None: : Adds a test result where result is either 'pass' or 'fail'.
- def getFlakyTests(threshold: int) -> List[str]: : Returns a list of test names flagged as flaky if they exceed the given threshold of failures.Example 1:
Input: detector = FlakyTestDetector(); detector.addTestResult('testA', 'fail'); detector.addTestResult('testA', 'pass'); detector.addTestResult('testA', 'fail'); detector.getFlakyTests(1)
Output: ['testA']
Explanation: 'testA' failed twice out of the last three executions. It is considered flaky.

Constraints:
- 1 <= testName.length <= 100
- threshold > 0`.