Visual Studio 2013 Ultimate provides a robust toolset for load testing applications. One of the most crucial aspects of load testing in Visual Studio is the ability to create custom configurations. This feature allows developers and quality assurance professionals to simulate user interactions with various software components to analyze performance under different conditions.

Understanding Custom Configuration in Load Testing

Custom configuration in Load Test Visual Studio 2013 Ultimate involves modifying several settings and parameters to suit specific test scenarios. It includes setting up test mix, network types, browser types, and user load as well as detailed data collectors configurations.

Key Components of a Load Test

1. Scenarios: This defines the specific conditions under which the test runs. It includes the test mix, which is a combination of web tests or unit tests that simulate various user interactions.
2. Virtual Users: Specifies the number of users interacting with the application. This can be configured to increase over time to stress test the application.
3. Browser Mix: Allows the simulation of various browsers accessing the application, helping to understand how the application performs across different platforms.
4. Network Mix: Simulates different network speeds and latencies to see how they affect application performance.

Setting Up Custom Configurations

To setup custom configurations in Visual Studio 2013 Ultimate:

1. Create a New Load Test: Navigate to Test > New Test > Load Test. The Load Test Wizard will start.
2. Define the Scenario Settings: Input the names of the scenarios and define the load pattern (i.e., constant load, step load, or goal-based load).
3. Choose the Test Mix: Add tests that have been created earlier (web performance test or unit tests).
4. Configure Virtual Users and Network Mix: Specify the number of users and choose the distribution across different types of networks.
5. Browser Mix Configuration: Define the percentage of virtual users that will use a specific browser.
6. Data and Diagnostics: Configure data collection such as performance counters, event logs, and application data to analyze after the test run.

Using the Load Test Editor

After creating the load test, the Load Test Editor can be used to further customizing the settings:

• Adding and Removing Tests: Right-click the test mix to add or remove tests.
• Adjust Load Patterns: Right-click the scenario to edit load patterns, increasing users over time or adjusting the test duration.

Examples of Custom Configurations

Here’s how you might set up a custom configuration to test a simple e-commerce application:

• Scenario: High User Load during a Sale Event
• Users: Start with 100 users and increase by 50 every 10 minutes until reaching 1000 users.
• Browser Mix: 50% Chrome, 30% Firefox, 20% Internet Explorer.
• Network Mix: 70% High-Speed, 30% Low-Speed connections.

Best Practices and Additional Tips

• Incremental Testing: Start with a low number of users and gradually increase to better understand at what point performance issues arise.
• Monitor and Analyze: Use Visual Studio’s inbuilt analysis tools to monitor the results in real-time and post test.
• Regular Updates: Regularly update the configurations based on new insights or application changes.

Summary Table

In conclusion, custom configurations in Load Test Visual Studio 2013 Ultimate are crucial for simulating real-world scenarios and identifying potential bottlenecks and performance issues in applications. With thorough planning, precise configuration, and careful analysis of the results, it’s possible to significantly enhance the performance and scalability of software solutions.