def "can write an empty file"() {
        when:
        builder.verifyMetadata = verifyMetadata
        builder.verifySignatures = verifySignatures
        serialize()

        then:
        contents == """<?xml version="1.0" encoding="UTF-8"?>
<verification-metadata>
   <configuration>
      <verify-metadata>$verifyMetadata</verify-metadata>
      <verify-signatures>$verifySignatures</verify-signatures>

            TomlParseResult result = Toml.parse(inputStream);
            assertNoParseErrors(result);
            TomlTable metadataTable = result.getTable(METADATA_KEY);
            verifyMetadata(metadataTable);
            TomlTable librariesTable = result.getTable(LIBRARIES_KEY);
            TomlTable bundlesTable = result.getTable(BUNDLES_KEY);
            TomlTable versionsTable = result.getTable(VERSIONS_KEY);

        void disableKeyServers() {
            builder.useKeyServers = false
        }

        void noMetadataVerification() {
            builder.verifyMetadata = false
        }

        void verifySignatures() {
            builder.verifySignatures = true
        }

        void keyServer(String uri) {
            builder.addKeyServer(new URI(uri))

import static org.gradle.api.internal.artifacts.verification.serializer.DependencyVerificationXmlTags.VERIFICATION_METADATA;
import static org.gradle.api.internal.artifacts.verification.serializer.DependencyVerificationXmlTags.VERIFY_METADATA;
import static org.gradle.api.internal.artifacts.verification.serializer.DependencyVerificationXmlTags.VERIFY_SIGNATURES;
import static org.gradle.api.internal.artifacts.verification.serializer.DependencyVerificationXmlTags.VERSION;