Execute parallel tests in batch builds

You can use AWS CodeBuild to execute parallel tests in batch builds. Parallel test execution is a testing approach where multiple test cases run simultaneously across different environments, machines, or browsers, rather than executing sequentially. This approach can significantly reduce overall test execution time and improve testing efficiency. In CodeBuild, you can split your tests across multiple environments and run them concurrently.

The key advantages of parallel test execution include:

Reduced execution time - Tests that would take hours sequentially can complete in minutes.
Better resource utilization - Makes efficient use of available computing resources.
Earlier feedback - Faster test completion means quicker feedback to developers.
Cost-effective - Saves both time and computing costs in the long run.

When implementing parallel test execution, two main approaches are commonly considered: separate environments and multithreading. While both methods aim to achieve concurrent test execution, they differ significantly in their implementation and effectiveness. Separate environments create isolated instances where each test suite runs independently, while multithreading executes multiple tests simultaneously within the same process space using different threads.

The key advantages of separate environments over multithreading include:

Isolation - Each test runs in a completely isolated environment, preventing interference between tests.
Resource conflicts - No competition for shared resources that often occurs in multithreading.
Stability - Less prone to race conditions and synchronization issues.