[Bug]: DockerDesktopClientProviderStrategy is always applicable

DockerDesktopClientProviderStrategy を調査し、socketPath、isApplicable()、getTransportConfig() に注目してください。まず Docker Desktop がない macOS で戦略の選択を再現し、その後、近くにあるテストまたは戦略のテストスイートを確認してください。ソケットが利用できない場合にその戦略が選択されず、設定が試行されている間に NullPointerException が発生しなければ完了です。

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