}

    private static class TestResolvedDependency implements ResolvedDependency, DependencyGraphNodeResult {
        String name
        String moduleGroup
        String moduleName
        String moduleVersion
        String configuration
        ResolvedModuleVersion module
        Set<ResolvedDependency> children = []
        Set<ResolvedDependency> parents
        Set<ResolvedArtifact> moduleArtifacts

import spock.lang.Specification

class ResourceVersionListerTest extends Specification {

    def repo = Mock(ExternalResourceRepository)
    def module = new DefaultModuleIdentifier("org.acme", "proj1")
    def moduleVersion = new DefaultModuleVersionIdentifier(module, "1.0")
    def artifact = new DefaultIvyArtifactName("proj1", "jar", "jar")
    def result = new DefaultBuildableModuleVersionListingResolveResult()

            type = "other"
        }
        String variants = result.variants.collect { variant ->
            "variant:${formatVariant(variant)}"
        }.join('@@')
        "[$type][id:${result.id}][mv:${result.moduleVersion}][reason:${formatReason(result.selectionReason as ComponentSelectionReasonInternal)}][$variants]"
    }

    protected String formatVariant(ResolvedVariantResult variant) {

    private final Set<String> moduleVersions;
    private final long ageMillis;

    public DefaultCachedModuleVersionList(Set<String> moduleVersions, long ageMillis) {
        this.moduleVersions = moduleVersions;
        this.ageMillis = ageMillis;
    }

    @Override
    public Set<String> getModuleVersions() {
        return moduleVersions;
    }

    @Override
    public Duration getAge() {

import javax.annotation.Nullable;
import java.io.File;
import java.time.Duration;
import java.util.Set;

public interface CachePolicy {
    Expiry versionListExpiry(ModuleIdentifier selector, Set<ModuleVersionIdentifier> moduleVersions, Duration age);

    Expiry missingModuleExpiry(ModuleComponentIdentifier component, Duration age);

    Expiry moduleExpiry(ModuleComponentIdentifier component, ResolvedModuleVersion resolvedModuleVersion, Duration age);