def dependency = Mock(Dependency)
        def projectDependency = Mock(ProjectDependency.class);

        when:
        configuration.dependencies.add(dependency)
        configuration.dependencies.add(projectDependency)

        then:
        configuration.dependencies as Set == [dependency, projectDependency] as Set
        configuration.dependencies.withType(ProjectDependency) as Set == [projectDependency] as Set
    }

import org.gradle.api.artifacts.DependencySet;
import org.gradle.api.artifacts.ExcludeRule;
import org.gradle.api.artifacts.ModuleVersionIdentifier;
import org.gradle.api.artifacts.ProjectDependency;
import org.gradle.api.artifacts.PublishArtifact;
import org.gradle.api.artifacts.PublishArtifactSet;
import org.gradle.api.artifacts.ResolutionStrategy;
import org.gradle.api.artifacts.ResolvableDependencies;

Currently, `ProjectDependency` and `FileCollectionDependency` implement this interface.
In Gradle 9.0, these types will no longer implement `SelfResolvingDependency`.
Instead, they will both directly implement `Dependency`.

As such, the following methods of `ProjectDependency` and `FileCollectionDependency` will no longer be available:

- `resolve`

                }
            }
            this.dependencies.put(configuration, statementGroup);
        }

        @Override
        public void projectDependency(String configuration, @Nullable String comment, String projectPath) {
            this.dependencies.put(configuration, new ProjectDepSpec(configuration, comment, projectPath));
        }

        @Override