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This PR is to fix a flaky test `com.dianping.cat.message.context.MessageIdFactoryTest#testDefaultDomainInParallel` in module `cat-client`, we found the problem when using the latest version. ### Reproduce test failures - Run the following commands...

Fix a flaky test testUserController

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This PR is to fix a flaky test `com.didispace.chapter21.Chapter21ApplicationTests#testUserController` in module `2.x/chapter2-1`, we found it when using the latest version of SpringBoot-Learning: 1. To reproduce test failures: - Run the...

This PR is to fix flaky tests caused by tests shared status. ### Problem If test `com.github.kevinsawicki.http.HttpRequestTest#customConnectionFactory` runs before other tests, such as `com.github.kevinsawicki.http.HttpRequestTest#headWithEscapedMappedQueryParams`, the latter one will fail: ```...