// ErrInvalidData unsupported data
	ErrInvalidData = errors.New("unsupported data")
	// ErrUnsupportedDriver unsupported driver
	ErrUnsupportedDriver = errors.New("unsupported driver")
	// ErrRegistered registered
	ErrRegistered = errors.New("registered")
	// ErrInvalidField invalid field
	ErrInvalidField = errors.New("invalid field")
	// ErrEmptySlice empty slice found
	ErrEmptySlice = errors.New("empty slice found")

import org.apache.maven.api.annotations.Nonnull;

/**
 * Access to {@link Type} registry.
 * <p>
 * This registry provides access to all registered artifact types, both standard types
 * provided by Maven and custom types registered through SPI provider implementations.
 *
 * @since 4.0.0
 */
@Experimental
public interface TypeRegistry extends ExtensibleEnumRegistry<Type> {

    /**

import (
	"database/sql"
	"slices"
	"testing"
)

// TestPostgreSQLRegistration checks if sql driver
// is registered and fails otherwise.
func TestMySQLRegistration(t *testing.T) {
	var found bool
	if slices.Contains(sql.Drivers(), "mysql") {
		found = true
	}
	if !found {
		t.Fatal("mysql driver not registered")
	}

    @Test
    void testStateTransitions() {
        assertEquals(WitnessRegistrationState.REGISTERING, registration.getState());

        registration.setState(WitnessRegistrationState.REGISTERED);
        assertEquals(WitnessRegistrationState.REGISTERED, registration.getState());

        registration.setState(WitnessRegistrationState.UNREGISTERING);
        assertEquals(WitnessRegistrationState.UNREGISTERING, registration.getState());

	// Transport configured with proxy_url if set optionally.
	transport http.RoundTripper

	// The subnet base URL
	BaseURL string
}

var configLock sync.RWMutex

// Registered indicates if cluster is registered or not
func (c *Config) Registered() bool {
	configLock.RLock()
	defer configLock.RUnlock()

	return len(c.APIKey) > 0
}

 * base for all providers that register such extensions.
 * <p>
 * Implementations of this interface are discovered through the Java ServiceLoader mechanism.
 * Each implementation must be registered in a {@code META-INF/services/} file corresponding
 * to the specific provider interface being implemented.
 * <p>
 * Example implementation for a custom language provider:
 * <pre>

                WitnessRegisterResponse response = rpcClient.register(request);

                if (response != null && response.isSuccess()) {
                    registration.setState(WitnessRegistrationState.REGISTERED);
                    registration.setContextHandle(response.getContextHandle());
                    registrations.put(registration.getRegistrationId(), registration);

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 * events to it.
 *
 * <p>Two subscribers are equivalent when they refer to the same method on the same object (not
 * class). This property is used to ensure that no subscriber method is registered more than once.
 *
 * @author Colin Decker
 */
class Subscriber {

  /** Creates a {@code Subscriber} for {@code method} on {@code listener}. */

                "Transfer listener is registered before test");
        wagonManager.getArtifact(artifact, repo, transferListener, false);
        assertFalse(
                wagon.getTransferEventSupport().hasTransferListener(transferListener),
                "Transfer listener still registered after getArtifact");

        /* putArtifact */