public Map<String, Object> getConfigProperties() {
        return configProperties;
    }

    /**
     * The properties available for use in the configuration file. These are substituted into the configuration file.
     */
    public void setConfigProperties(@Nullable Map<String, Object> configProperties) {
        this.configProperties = configProperties;
    }

    /**

        """
    }

    @Issue("https://github.com/gradle/gradle/issues/21301")
    def "can pass a URL in configProperties"() {
        given:
        buildFile """
            apply plugin: 'checkstyle'

            checkstyle {
                configProperties["some"] = new URL("https://gradle.org/")
            }
        """

        file('src/main/java/Dummy.java') << javaClassWithNewLineAtEnd()

     */
    public Map<String, Object> getConfigProperties() {
        return configProperties;
    }

    /**
     * The properties available for use in the configuration file. These are substituted into the configuration file.
     */
    public void setConfigProperties(Map<String, Object> configProperties) {
        this.configProperties = configProperties;
    }

    /**

        extension.configDirectory.get().getAsFile() == project.file("config/checkstyle")
        extension.config.inputFiles.singleFile == project.file("config/checkstyle/checkstyle.xml")
        extension.configProperties == [:]
        extension.reportsDir == project.file("build/reports/checkstyle")
        !extension.ignoreFailures
    }

    def "configures checkstyle task for each source set"() {

        def showViolations = parameters.showViolations.get()
        def maxErrors = parameters.maxErrors.get()
        def maxWarnings = parameters.maxWarnings.get()
        def configProperties = parameters.configProperties.getOrElse([:])
        def ignoreFailures = parameters.ignoreFailures.get()
        def config = parameters.config.get()
        def configDir = parameters.configDirectory.asFile.getOrNull()

            <tr>
                <td>maxWarnings</td>
                <td><literal>project.checkstyle.maxWarnings</literal></td>
            </tr>
            <tr>
                <td>configProperties</td>
                <td><literal>project.checkstyle.configProperties</literal></td>
            </tr>
            <tr>
                <td>source</td>
                <td><literal><replaceable>sourceSet</replaceable>.allJava</literal></td>

 *
 * @since 4.0.0
 */
interface RepositorySystemSessionExtender {
    void extend(
            MavenExecutionRequest mavenExecutionRequest,
            Map<String, Object> configProperties,
            MirrorSelector mirrorSelector,
            ProxySelector proxySelector,
            AuthenticationSelector authenticationSelector);

                <td>configDirectory</td>
                <td><literal><replaceable>${rootProject.projectDir}</replaceable>/config/checkstyle</literal></td>
            </tr>
            <tr>
                <td>configProperties</td>
                <td><literal>[:]</literal></td>
            </tr>
            <tr>
                <td>enableExternalDtdLoad</td>
                <td><literal>false</literal></td>
            </tr>

        expect:
        with(checkstyle) {
            checkstyleClasspath == null
            classpath == null
            configFile == null
            config == null
            configProperties == [:]
            !reports.xml.required.get()
            !reports.xml.outputLocation.isPresent()
            reports.xml.outputType == Report.OutputType.FILE
            !reports.html.required.get()

        request.setSystemProperties(properties);
        Map<String, Object> configProperties =
                systemSessionFactory.newRepositorySession(request).getConfigProperties();
        assertEquals(String.valueOf(Float.MAX_VALUE), configProperties.get("aether.priority.FileTransporterFactory"));
        assertEquals(String.valueOf(Float.MAX_VALUE), configProperties.get("aether.priority.ApacheTransporterFactory"));