The Current State of Integration Tests

Oct 13, 2025 by wbrum.org 57 views

Introduction

Integration tests are a crucial aspect of ensuring the stability and reliability of software applications. They verify that different components of the system work together seamlessly, simulating real-world scenarios. However, as the complexity of the application grows, so does the number of integration tests, making it essential to organize them effectively. In this article, we will explore the importance of organizing integration tests and propose a better approach to categorize them.

The Current State of Integration Tests

The current integration test structure has been merged into a single class, ClientIntegrationTests, which instantiates a client in the test code. However, this approach has raised concerns about the previous ServerIntegrationTests, which tested the McpServer code via the TestServer project. The introduction of SseServerIntegrationTests on the SSE server support branch has further complicated the matter.

The Importance of Integration Tests

Integration tests are essential in the context of MCP due to its complex nature. They help ensure that different components of the system work together correctly, reducing the likelihood of errors and bugs. While integration tests can be heavy-duty and awkward, as seen in the use of a containerized everything server instead of the npx-based one, they are still a vital part of the testing process.

Proposed Organization Structure

To better organize integration tests, it is proposed to categorize them based on whether they exercise the client, server, or both. This approach will help to:

Simplify the test structure and make it easier to maintain
Improve test readability and understandability
Reduce test duplication and increase reusability
Enhance test coverage and ensure that all components are thoroughly tested

Client-Specific Integration Tests

Client-specific integration tests should focus on verifying the client's functionality, including its ability to communicate with the server, handle errors, and perform specific actions. These tests should be organized under a separate suite, such as ClientIntegrationTests, and should include tests for:

Client initialization and configuration
Client-server communication (e.g., sending and receiving data)
Error handling and edge cases
Client-specific features and functionality

Server-Specific Integration Tests

Server-specific integration tests should focus on verifying the server's functionality, including its ability to handle client requests, process data, and return responses. These tests should be organized under a separate suite, such as ServerIntegrationTests, and should include tests for:

Server initialization and configuration
Server-client communication (e.g., receiving and processing client requests)
Error handling and edge cases
Server-specific features and functionality

Bilateral Integration Tests

Bilateral integration tests should focus on verifying the interaction between the client and server, including their ability to communicate with each other, handle errors, and perform specific actions. These tests should be organized under a separate suite, such as BilateralIntegrationTests, and should include tests for:

Client-server communication (e.g., sending and receiving data)
Error handling and edge cases
Bilateral-specific features and functionality

Authorization Feature Integration Tests

The Authorization feature, which is still in active development, is expected to require a significant amount of integration test code. It is proposed to create a separate suite for Authorization feature integration tests, which should include tests for:

Authorization flow and PKCE implementation
Error handling and edge cases
Authorization-specific features and functionality

Conclusion

Introduction

In our previous article, we discussed the importance of organizing integration tests and proposed a better approach to categorize them. In this article, we will address some frequently asked questions (FAQs) related to organizing integration tests.

Q: Why is it necessary to organize integration tests?

A: Organizing integration tests is essential to ensure the stability and reliability of software applications. It helps to simplify the test structure, improve test readability, reduce test duplication, and enhance test coverage.

Q: What are the benefits of categorizing integration tests based on whether they exercise the client, server, or both?

A: Categorizing integration tests based on whether they exercise the client, server, or both has several benefits, including:

Simplifying the test structure and making it easier to maintain
Improving test readability and understandability
Reducing test duplication and increasing reusability
Enhancing test coverage and ensuring that all components are thoroughly tested

Q: How can I determine which tests belong to which category?

A: To determine which tests belong to which category, you can follow these steps:

Identify the main component being tested (e.g., client, server, or both).
Determine the specific functionality being tested (e.g., client initialization, server processing, or client-server communication).
Categorize the test based on the main component and specific functionality being tested.

Q: What about tests that involve multiple components or complex scenarios?

A: Tests that involve multiple components or complex scenarios can be categorized as bilateral integration tests. These tests should focus on verifying the interaction between the client and server, including their ability to communicate with each other, handle errors, and perform specific actions.

Q: How can I ensure that all components are thoroughly tested?

A: To ensure that all components are thoroughly tested, you can follow these best practices:

Create a comprehensive test plan that covers all components and scenarios.
Use a combination of unit tests, integration tests, and end-to-end tests to ensure thorough coverage.
Regularly review and update the test plan to reflect changes in the application or new requirements.

Q: What about the Authorization feature integration tests? How should I organize them?

A: The Authorization feature integration tests should be organized as a separate suite, which should include tests for:

Authorization flow and PKCE implementation
Error handling and edge cases
Authorization-specific features and functionality

Q: How can I maintain and update the organized integration tests?

A: To maintain and update the organized integration tests, you can follow these best practices:

Regularly review and update the test plan to reflect changes in the application or new requirements.
Use a version control system to track changes and collaborate with team members.
Automate test execution and reporting to ensure efficient and accurate testing.

Conclusion

Organizing integration tests effectively is crucial to ensure the stability and reliability of software applications. By categorizing integration tests based on whether they exercise the client, server, or both, and following best practices for maintenance and updates, you can simplify the test structure, improve test readability, reduce test duplication, and enhance test coverage.