Requirements

Let's design a simplified version of a browser testing platform like BrowserStack or Sauce Labs. The core idea is to allow users to remotely execute automated browser tests on different browser and operating system combinations without needing to manage their own infrastructure. Think of it as "Browser Testing as a Service." This means abstracting away the complexities of setting up and maintaining different browser environments. At a high level, a user defines a test suite (e.g., Selenium, Cypress, Playwright scripts) and configuration (browser type, browser version, operating system). The platform then provisions an environment matching the configuration, executes the test suite, captures the results (logs, screenshots, videos), and reports them back to the user. This problem zeroes in on the *execution* and *management* aspects, not the UI or large-scale infrastructure. We're focusing on the core business logic within the platform. # Requirements ## Functional Requirements 1. **Test Suite Submission:** Users should be able to submit a test suite for execution. The test suite can be represented as a collection of test cases (e.g., Java files with JUnit tests, JavaScript files with Mocha tests). We'll assume the test suite is provided as a zip file or a URL pointing to a zip file. 2. **Configuration Definition:** Users must be able to specify the desired browser configuration (browser type, version, operating system). The platform needs to support a matrix of different browser/OS combinations. Examples: Chrome 90 on Windows 10, Firefox 80 on macOS Big Sur, Safari 14 on iOS 14. 3. **Environment Provisioning:** The platform should be able to provision a testing environment (e.g., a virtual machine or container) matching the user-specified configuration. This is the core abstraction of the problem. You don't need to *actually* provision VMs, just simulate the provisioning process. We need a good abstraction for this. 4. **Test Execution:** Once the environment is provisioned, the platform should execute the test suite within that environment. We'll assume an external test runner (e.g., JUnit, Mocha) handles the actual execution of the tests. The platform is responsible for orchestrating the execution and capturing the results. This requires some interaction with the "provisioned environment". 5. **Result Reporting:** The platform must collect the test results (logs, screenshots, videos) from the executed test suite and provide them to the user. This needs to be flexible to support different test runner outputs. 6. **Concurrency:** The platform should support concurrent test executions. Multiple users should be able to submit and execute tests simultaneously, without interfering with each other. 7. **Environment Cleanup:** After test execution, the provisioned environment must be cleaned up (e.g., VM or container destroyed). ## Non-Functional Requirements 1. **Thread Safety:** The platform must be thread-safe to handle concurrent test executions. Concurrent access to shared resources (e.g., environment pool, test execution queue) must be properly synchronized. 2. **Extensibility:** The platform should be extensible to support new browser types, operating systems, and test runners without requiring major code changes. Consider new test frameworks like Cypress or Playwright, or future versions of Chrome or Firefox. This calls for a flexible design. 3. **Modularity:** The platform should be modular, with well-defined components and interfaces. This makes the code easier to understand, maintain, and test. A clear separation of concerns is important. 4. **Testability:** The code should be easily testable, with unit tests covering all critical components. Dependencies should be easily mockable. 5. **Resource Management:** The platform should efficiently manage resources (e.g., VMs, containers, threads). This might involve pooling resources or using techniques to avoid resource exhaustion. 6. **Error Handling:** Implement robust error handling to gracefully manage unexpected situations like test suite failures, environment provisioning errors, and resource allocation failures. This is essential for a real-world service. 7. **Configuration Management:** The system should have a clear way to configure the available environments, test runners, and other platform parameters. ## Core Entities 1. **`Test`:** Represents a single test case (e.g., a JUnit test, a Mocha test). Could contain information such as test name, description, and expected outcome. 2. **`TestSuite`:** Represents a collection of `Test` objects. Contains information about the test suite as a whole, such as the location of the test suite files and any dependencies. 3. **`Configuration`:** Represents the desired browser configuration (browser type, version, operating system). 4. **`Environment`:** Represents the provisioned testing environment (e.g., a virtual machine or container). This needs a clear interface for interacting with the test execution. 5. **`EnvironmentProvider`:** An abstraction for provisioning and managing environments. This is where the heavy lifting of creating/destroying environments happens (in a real system). 6. **`TestRunner`:** An abstraction for executing a `TestSuite` within an `Environment`. Responsible for orchestrating the test execution and capturing the results. 7. **`TestResult`:** Represents the results of a test execution, including logs, screenshots, and videos. 8. **`TestExecutionRequest`**: Represents the request to execute a TestSuite with specific Configuration. Includes the TestSuite, Configuration and any additional execution parameters. 9. **`TestExecutionService`**: Orchestrates the test execution process, managing the provisioning of environments, the execution of tests, and the collection of results. This is the central coordinator.

Design Browser testing Application like browserstack / sauce labs.

Requirements

Interview Simulation

Functional Requirements

💡 Interview Tip

Non-Functional Requirements

Core Entity Identification

Premium Content