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Wiki source code of Enhance Test Execution Speed

Version 1.2 by chrisby on 2023/05/29 20:30
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chrisby 1.1 1 Fast-executing tests require less time and are executed more frequently, contributing to improved code quality. Therefore a high test execution speed is important.
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4 === Measures ===
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6 * **Test type segregation**: Unit tests typically run much faster than other types of tests. For large test suites, consider running unit tests regularly on the developer's local machine, while scheduling more resource-intensive tests to run at a fixed rate in a continuous integration environment, for example.
7 * **Partial testing**: You don't have to run all tests every time. Often, it is sufficient to run only the tests related to recently changed code.
8 * **Mock slow dependencies** to minimize code execution time, especially operations such as I/O, transaction management, and networking.
9 * **Prefer in-memory databases during testing** for cleaner and faster operations compared to standard databases.
10 * **Identify performance bottlenecks** by increasing the number of threads:
11 ** If execution time remains constant, CPU is the bottleneck. Mitigate with faster CPUs, more cores, or additional machines.
12 ** If execution time decreases, I/O is the bottleneck. Use more threads, faster memory (such as SSDs), or additional storage.
13 * **Improve I/O speed by using RAM disks**, such as Linux's tmpfs tool. Configure your tests to direct all file interactions to the RAM disk.
14 * **Parallelize test execution.** Multiple threads can improve execution speed even on single-core processors by keeping the CPU busy while other threads wait for disk I/O.
15 * **Offload CPU-intensive tasks** to cloud-based computing resources:
16 ** Upload project files to the cloud.
17 ** The cloud service builds the project, runs tests, and generates a test report.
18 ** Upon completion, download the test report from the cloud.