`GradleRunner` is an API provided by TestKit, which internally uses the Tooling API to execute the build.

The following example applies the plugin to the build script under test, configures the extension and executes the build with the task `verifyUrl`.
Please see the <<test_kit.adoc#test_kit,TestKit documentation>> to get more familiar with the functionality of TestKit.

.UrlVerifierPluginFunctionalTest.groovy
[source,groovy]

 */

package org.gradle.testkit.runner

import org.gradle.initialization.StartParameterBuildOptions
import org.gradle.testkit.runner.fixtures.NonCrossVersion
import org.gradle.util.internal.TextUtil

import static org.gradle.testkit.runner.TaskOutcome.FAILED
import static org.gradle.testkit.runner.TaskOutcome.FROM_CACHE
import static org.gradle.testkit.runner.TaskOutcome.SKIPPED

    response = client.get("/items/foo")
    assert response.status_code == 404, response.text
    assert response.json() == {"detail": "Item not found, there's only a plumbus here"}


def test_get(client: TestClient):
    response = client.get("/items/plumbus")
    assert response.status_code == 200, response.text
    assert response.json() == "plumbus"


def test_fastapi_error(client: TestClient):

                def testKit = dependencies.gradleTestKit().files
                doLast {
                    assert testRuntimeClasspath.files.containsAll(testKit.files)
                }
            }

            task assertIntegrationTestHasTestKit() {
                def testRuntimeClasspath = project.sourceSets.integrationTest.runtimeClasspath
                def testKit = dependencies.gradleTestKit().files

 */

package org.gradle.testkit.runner.internal

import org.gradle.testkit.runner.BuildTask
import org.gradle.testkit.runner.UnsupportedFeatureException
import org.gradle.testkit.runner.internal.feature.TestKitFeature
import org.gradle.util.GradleVersion
import spock.lang.Specification

import static org.gradle.testkit.runner.TaskOutcome.FAILED
import static org.gradle.testkit.runner.TaskOutcome.SUCCESS

// tag::functional-test-junit[]
import org.gradle.testkit.runner.BuildResult;
import org.gradle.testkit.runner.GradleRunner;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.io.TempDir;

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;

import static org.gradle.testkit.runner.TaskOutcome.SUCCESS;

 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.gradle.testkit.runner

import org.gradle.testkit.runner.fixtures.NoDebug
import org.gradle.testkit.runner.fixtures.NonCrossVersion

@NonCrossVersion
@NoDebug
class GradleRunnerConfigurationIntegrationTest extends BaseGradleRunnerIntegrationTest {

 * limitations under the License.
 */

package org.gradle.testkit.runner

import org.gradle.integtests.fixtures.executer.DaemonGradleExecuter
import org.gradle.test.fixtures.ConcurrentTestUtil
import org.gradle.test.precondition.Requires
import org.gradle.test.preconditions.IntegTestPreconditions
import org.gradle.testkit.runner.fixtures.CustomDaemonDirectory
import org.gradle.testkit.runner.fixtures.NoDebug
import org.gradle.util.GradleVersion

 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.gradle.testkit.runner


import org.gradle.testkit.runner.internal.DefaultGradleRunner
import org.gradle.util.GradleVersion
import org.junit.Assume

class GradleRunnerIsolationIntegrationTest extends BaseGradleRunnerIntegrationTest {

package org.myorg

import org.gradle.testkit.runner.GradleRunner
import spock.lang.Specification
import spock.lang.TempDir

import static org.gradle.testkit.runner.TaskOutcome.SUCCESS

class UrlVerifierPluginFunctionalTest extends Specification {
    @TempDir File testProjectDir
    File buildFile

    def setup() {
        buildFile = new File(testProjectDir, 'build.gradle')
        buildFile << """
            plugins {