Hey everyone, Wesley introduces unique cache runners. Creating a test runner from scratch to understand application workings with different models like BAM and Gnu. Testing scenarios reveal errors with Node.js and model definitions. BAM issues arise from gestures and mishbang conflicts while running tests. Isolation problems occur as gest loses context between runtimes. Common conflicts in test processing modes affect CLI projects and workers, posing challenges for project maintenance and runtime compatibility. Complexity of test dependencies across various runtimes challenges test runners. Emphasis on precise testing aligned with JavaScript coding philosophy. Configuration complexities for beginners in setting up tests with specific extensions and experimental features. Understanding Jest behavior and challenges in aligning test flows with JavaScript. Confusion for beginners in test execution sequencing and expectations. Importance of creating boilerplates for test execution control. Creating a custom test runner to support different runtimes and simplify testing processes. Importance of understanding the challenges faced by junior developers in test setup. Implementing a procedural approach to test execution across various runtimes. Creating subprocesses to run files across various runtimes, ensuring tests run consistently. Implementing a test executor to handle runtimes and subprocess creation efficiently. Enhancing performance by managing test files, concurrency, resource allocation, and memory usage. Introducing assert in testing for user simplicity and efficient reporting. Emphasizing developer experience and the philosophy behind project creation.