private static final TypeOf<ExtraPropertiesExtension> EXTRA_PROPERTIES_EXTENSION_TYPE = typeOf(ExtraPropertiesExtension.class);
    private final DefaultConvention.ExtensionsDynamicObject extensionsDynamicObject = new ExtensionsDynamicObject();
    private final ExtensionsStorage extensionsStorage = new ExtensionsStorage();
    private final ExtraPropertiesExtension extraProperties = new DefaultExtraPropertiesExtension();

import org.gradle.api.Project
import org.gradle.api.plugins.ExtraPropertiesExtension
import org.gradle.testfixtures.ProjectBuilder
import spock.lang.Specification

/**
 * Contract test for dynamic extension implementations.
 *
 * @param <T> The concrete implementation type
 */
abstract class ExtraPropertiesExtensionTest<T extends ExtraPropertiesExtension> extends Specification {
    
    T extension

    def setup() {

 * limitations under the License.
 */

package org.gradle.nativeplatform.toolchain.plugins

import org.gradle.api.Plugin
import org.gradle.api.plugins.ExtensionAware
import org.gradle.api.plugins.ExtraPropertiesExtension
import org.gradle.nativeplatform.toolchain.NativeToolChain
import org.gradle.nativeplatform.toolchain.NativeToolChainRegistry
import org.gradle.nativeplatform.toolchain.internal.NativeToolChainInternal

 * limitations under the License.
 */

package org.gradle.kotlin.dsl.accessors.tasks

import org.gradle.api.Project
import org.gradle.api.plugins.ExtraPropertiesExtension
import org.gradle.api.tasks.Delete
import org.gradle.api.tasks.SourceSet
import org.gradle.api.tasks.SourceSetContainer
import org.gradle.api.tasks.TaskContainer

 * limitations under the License.
 */
package org.gradle.internal.extensibility;

import groovy.lang.MissingMethodException;
import groovy.lang.MissingPropertyException;
import org.gradle.api.plugins.ExtraPropertiesExtension;
import org.gradle.internal.instantiation.InstanceGenerator;
import org.gradle.internal.metaobject.AbstractDynamicObject;
import org.gradle.internal.metaobject.BeanDynamicObject;

            withBuildScript(accessFlavor)
            buildAndFail("help").apply {
                assertHasFailure("Extension of type 'SourceDirectorySet' does not exist. Currently registered extension types: [ExtraPropertiesExtension, VersionCatalogsExtension]") {}
            }
        }
    }

    @Test
    @UnsupportedWithConfigurationCache(because = "test configuration phase")
    fun `can access project conventions`() {

Subprojects can access extra properties on their parent projects.

For more information about extra properties, see
link:{groovyDslPath}/org.gradle.api.plugins.ExtraPropertiesExtension.html[ExtraPropertiesExtension] in the API documentation.

[[sec:configuring_arbitrary_objects]]
=== Configure Arbitrary Objects

The example `greet()` task shows an example of arbitrary object configuration:

====

            </tr>
            <tr>
                <td>org.gradle.api.plugins.ExtensionAware</td>
            </tr>
            <tr>
                <td>org.gradle.api.plugins.ExtraPropertiesExtension</td>
            </tr>
            <tr>
                <td>org.gradle.plugin.use.PluginDependenciesSpec</td>
            </tr>
            <tr>

Method <org.gradle.kotlin.dsl.ExtraPropertiesExtensionsKt.invoke(org.gradle.api.plugins.ExtraPropertiesExtension, kotlin.jvm.functions.Function0)> has arguments/return type kotlin.jvm.functions.Function0 that is not Gradle public API or primitive or built-in JDK classes or Kotlin classes in (ExtraPropertiesExtensions.kt:0)