def testClosure = {
            return it != "b"
        }

        container.add("a")
        container.add("b")
        container.add("c")

        expect:
        toList(container.matching(spec)) == ["a", "c"]
        toList(container.matching(testClosure)) == ["a", "c"]
    }

    def filteredCollectionIsLive() {
        def spec = new Spec<CharSequence>() {
            boolean isSatisfiedBy(CharSequence element) {

        rootDir.file("subdir2/file2.txt").write("content");
        archiveFileToRoot(getArchiveFile());

        assertVisits(getTree(), toList("subdir/file1.txt", "subdir2/file2.txt"), toList("subdir", "subdir2"));
        assertSetContainsForAllTypes(getTree(), toList("subdir/file1.txt", "subdir2/file2.txt"));
    }

    @Test
    public void canStopVisitingFiles() {

    }

    public static List<String> toList(Object[] objects) {
        return Stream.of(objects).map(Object::toString).map(String::trim).collect(Collectors.toList());
    }

    /**
     * MySQL doesn't support array type. So array in H2 `1,2,3` will be a string like '(1,2,3)'
     */
    public static List<String> toList(Object object) {
        if (object == null) {
            return null;

        MinimalFileTree tree = tree("file.txt", action);

        assertVisits(tree, toList("file.txt"), Collections.<String>emptyList());

        TestFile file = rootDir.file("file.txt");

        file.assertContents(equalTo("content"));
        file.makeOlder();
        TestFile.Snapshot snapshot = file.snapshot();

        assertVisits(tree, toList("file.txt"), Collections.<String>emptyList());

        
        then:
        output1.exists() && output2.exists()
        [input1, input2] == operation.filesToSign.files.toList()[0..1]
        [output1, output2] == operation.signatureFiles.files.toList()[0..1]
        [output1, output2] == operation.signatures*.file.toList()
    }

    def "sign multiple artifacts with defaults"() {
        when:
        def operation = signing.sign(input1Artifact, input2Artifact)

        rootDir.file("subdir2/file2.txt").write("content");
        rootDir.tgzTo(tgz);

        TarFileTree tree = tarTree(tgz);

        assertVisits(tree, toList("subdir/file1.txt", "subdir2/file2.txt"), toList("subdir", "subdir2"));
        assertSetContainsForAllTypes(tree, toList("subdir/file1.txt", "subdir2/file2.txt"));
    }

    @Test
    public void readsBzippedTarFile() {

import org.gradle.api.tasks.TaskContainer;

import java.util.Collection;
import java.util.List;
import java.util.Set;
import java.util.stream.Collectors;

import static java.util.stream.Collectors.toList;

public abstract class DependencyReportsPlugin implements Plugin<Project> {

    @Override
    public void apply(Project project) {

        project.getPluginManager().withPlugin("java-base", plugin -> {

    /* toList modifications reflected in fromList */
    toList.remove(0);
    assertEquals(asList(5, 9, 3), fromList);
    toList.add(7);
    assertEquals(asList(7, 5, 9, 3), fromList);
    toList.add(5);
    assertEquals(asList(5, 7, 5, 9, 3), fromList);
    toList.remove(Integer.valueOf(5));
    assertEquals(asList(5, 7, 9, 3), fromList);
    toList.set(1, 8);
    assertEquals(asList(5, 7, 8, 3), fromList);
    toList.clear();

    /* toList modifications reflected in fromList */
    toList.remove(0);
    assertEquals(asList(5, 9, 3), fromList);
    toList.add(7);
    assertEquals(asList(7, 5, 9, 3), fromList);
    toList.add(5);
    assertEquals(asList(5, 7, 5, 9, 3), fromList);
    toList.remove(Integer.valueOf(5));
    assertEquals(asList(5, 7, 9, 3), fromList);
    toList.set(1, 8);
    assertEquals(asList(5, 7, 8, 3), fromList);
    toList.clear();

    public T addArguments(String... arguments) {
        operationParamsBuilder.addArguments(CollectionUtils.toList(Preconditions.checkNotNull(arguments)));
        return getThis();
    }

    @Override
    public T addArguments(Iterable<String> arguments) {
        operationParamsBuilder.addArguments(CollectionUtils.toList(Preconditions.checkNotNull(arguments)));
        return getThis();
    }

    @Override