import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)

    @Suppress("unused")
    private
    abstract class Receiver {
        @Adding
        abstract fun lambdaRequired(x: Int, configure: Receiver.() -> Unit): Receiver

        @Adding
        abstract fun lambdaOptional(x: Int, configure: Receiver.() -> Unit = { }): Receiver

        @Adding
        abstract fun lambdaNotAllowed(x: Int): Receiver
    }

package org.gradle.internal.declarativedsl.demo.demoPlugins

import org.gradle.declarative.dsl.model.annotations.Adding
import org.gradle.declarative.dsl.model.annotations.Builder
import org.gradle.declarative.dsl.model.annotations.Configuring
import org.gradle.declarative.dsl.model.annotations.HasDefaultValue
import org.gradle.declarative.dsl.model.annotations.Restricted


class TopLevelScope {
    @get:Restricted
    val plugins = PluginsBlock()

    execution failed for task :tooling-api:gradle3.5.1CrossVersionTest'.
    > No tests found for given includes: [org.gradle.integtests.tooling.r81.LogLevelConfigCrossVersionSpec](--tests filter)`

You can fix it by adding `-PtestJavaVersion=8` to the build.

This is due to the fact that Gradle 4.6 and older don't support Java 11 and newer, which is checked before the test filter is applied.

import org.gradle.api.Action;
import org.gradle.api.artifacts.dsl.RepositoryHandler;
import org.gradle.api.initialization.ConfigurableIncludedPluginBuild;
import org.gradle.declarative.dsl.model.annotations.Adding;
import org.gradle.declarative.dsl.model.annotations.Configuring;
import org.gradle.declarative.dsl.model.annotations.Restricted;
import org.gradle.internal.HasInternalProtocol;

        when:
        provider1.value = ["buzz", "fizz", "foo"]

        then:
        source.iterator().collect() == ["foo", "buzz", "fizz"]
    }

    def "adding is not ignored when a realized provider currently has the same value"() {
        def provider1 = setProvider("foo")

        when:
        source.addPendingCollection(provider1)
        source.realizePending()

               - Variant sources provides com.google.code.gson:gson:2.8.5

com.google.code.gson:gson:2.8.5 FAILED
\--- functionalTestClasspath

A web-based, searchable dependency report is available by adding the --scan option.

BUILD SUCCESSFUL in 0s

        then:
        output.indexOf('initscript2!') < output.indexOf('initscript1!')
        configurationCache.assertStateStored()
    }

    def "invalidates cache upon adding init script to command line"() {

        given:
        def initScript1 = file('initscript1.gradle.kts').tap {
            text = 'println("initscript1!")'
        }

1. *Specify a file on the command line* with the option `-I` or `--init-script` followed by the path to the script.
+
The command line option can appear more than once, each time adding another init script. The build will fail if any files specified on the command line do not exist.
2. *Put a file called `init.gradle(.kts)`* in the `__$<<directory_layout.adoc#dir:gradle_user_home,GRADLE_USER_HOME>>__/` directory.

A web-based, searchable dependency report is available by adding the --scan option.

BUILD SUCCESSFUL in 0s