[Bug]: DockerDesktopClientProviderStrategy is always applicable

Module

Core

Testcontainers version

2.0.5

Using the latest Testcontainers version?

Yes

Host OS

macOS

Host Arch

ARM

Docker version

29.5.3

What happened?

DockerDesktopClientProviderStrategy is always applicable even when Docker Desktop is not installed at all. It happens because the socketPath field is annotated with @Getter(lazy = true) and so its actual type is AtomicReference, but the isApplicable() method checks nullability as this.socketPath != null.

@Getter(lazy = true)
@Nullable
private final Path socketPath = resolveSocketPath();

@Override
protected boolean isApplicable() {
    return (SystemUtils.IS_OS_LINUX || SystemUtils.IS_OS_MAC) && this.socketPath != null;
}

Finally, the getTransportConfig() method fails with NPE as getSocketPath() returns null.

@Override
public TransportConfig getTransportConfig() throws InvalidConfigurationException {
    return TransportConfig.builder().dockerHost(URI.create("unix://" + getSocketPath().toString())).build();
}

Relevant log output

[Test worker] ERROR o.t.d.DockerClientProviderStrategy - Could not find a valid Docker environment. Please check configuration. Attempted configurations were:
	UnixSocketClientProviderStrategy: failed with exception InvalidConfigurationException (Could not find unix domain socket). Root cause NoSuchFileException (/var/run/docker.sock)
	DockerDesktopClientProviderStrategy: failed with exception NullPointerException (Cannot invoke "java.nio.file.Path.toString()" because the return value of "org.testcontainers.dockerclient.DockerDesktopClientProviderStrategy.getSocketPath()" is null)

Additional Information

No response

Inspect DockerDesktopClientProviderStrategy, focusing on socketPath, isApplicable(), and getTransportConfig(). Start by reproducing the strategy selection on macOS without Docker Desktop, then review nearby tests or the strategy test suite. Done means the strategy is not selected when its socket is unavailable and no NullPointerException occurs while configurations are attempted.