'How to Write Better Tests and Prevent Flaky Tests' flakytests testing
Many people are familiar with the situation when a project has some tests that either pass successfully or fail. Such tests are called flaky, and in this article, we will talk about how to avoid creating such tests.1. Unstable EnvironmentFor example, tests use some common database deployed for all tests. When running multiple build jobs in parallel in CI/CD pipelines, the tests modify each other's data.
The most reliable solution, in this case, is to isolate the environments. For example, you can run a database in a docker container . Thus, one test run will exclusively use its database, and after the test run, it will terminate it. It is also important not to forget to clean up the state after each test not to affect the following tests in the test suite.A more rare cause is the use of schedulers or deferred operations.// every hour at 00 second, 00 minute
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