check for docker availability

[mvysny]

It would be good to have a way to check whether Docker is actually available or not, as a simple static boolean function, e.g. public static boolean DockerClient.isDockerAvailable(). That would allow us to use JUnit/TestNG-specific ways to skip tests which require docker containers.

[mvysny]

There is a similar feature request here: #343 . However, this feature request is much simpler.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. If you believe this is a mistake, please reply to this comment to keep it open. If there isn't one already, a PR to fix or at least reproduce the problem in a test case will always help us get back on track to tackle this.

[mvysny]

The PR #2605 can be used as follows: DockerClientFactory.instance().isDockerAvailable().

[harryarora26]

In java one can use the following:

try {
	DockerClientFactory.instance().client();
} catch (Exception e) {
      	Assert.fail(e.getMessage());
}

[jkosternl]

For others searching for a similar solution, this works in the current version of TestContainers:
@Testcontainers(disabledWithoutDocker = true)
The unit tests are skipped without errors.