Stop using JUnit 4 rules

Author: rpalcolea

build.gradle

@@ -1,6 +1,6 @@
 
 plugins {
-    id 'com.netflix.nebula.plugin-plugin' version '22.0.2'
+    id 'com.netflix.nebula.plugin-plugin' version '24.0.5'
     id "org.jetbrains.kotlin.jvm" version "2.2.0"
 }
 
@@ -14,6 +14,7 @@ dependencies {
     testImplementation 'cglib:cglib-nodep:3.2.4'
     testImplementation 'org.apache.commons:commons-io:1.3.2'
     testImplementation 'uk.org.webcompere:system-stubs-junit4:2.0.1'
+    integTestImplementation 'org.spockframework:spock-core:2.3-groovy-4.0'
 }
 
 contacts {

gradle.lockfile

@@ -11,8 +11,10 @@ commons-io:commons-io:1.3.2=integTestCompileClasspath,integTestRuntimeClasspath,
 net.bytebuddy:byte-buddy-agent:1.11.13=integTestCompileClasspath,integTestRuntimeClasspath,testCompileClasspath,testRuntimeClasspath
 net.bytebuddy:byte-buddy:1.15.11=integTestCompileClasspath,integTestRuntimeClasspath,testCompileClasspath,testRuntimeClasspath
 org.apache.commons:commons-io:1.3.2=integTestCompileClasspath,integTestRuntimeClasspath,testCompileClasspath,testRuntimeClasspath
+org.apache.groovy:groovy:4.0.4=integTestCompileClasspath,integTestRuntimeClasspath
 org.apiguardian:apiguardian-api:1.1.2=integTestCompileClasspath,integTestRuntimeClasspath,testCompileClasspath,testRuntimeClasspath
 org.assertj:assertj-core:3.27.3=integTestCompileClasspath,integTestRuntimeClasspath,testCompileClasspath,testRuntimeClasspath
+org.hamcrest:hamcrest:2.2=integTestCompileClasspath,integTestRuntimeClasspath
 org.jetbrains.kotlin:kotlin-stdlib:2.2.0=compileClasspath,integTestCompileClasspath,integTestRuntimeClasspath,runtimeClasspath,testCompileClasspath,testRuntimeClasspath
 org.jetbrains:annotations:13.0=compileClasspath,integTestCompileClasspath,integTestRuntimeClasspath,runtimeClasspath,testCompileClasspath,testRuntimeClasspath
 org.jspecify:jspecify:1.0.0=integTestCompileClasspath,integTestRuntimeClasspath,testCompileClasspath,testRuntimeClasspath
@@ -23,6 +25,7 @@ org.mockito:mockito-core:3.12.4=integTestCompileClasspath,integTestRuntimeClassp
 org.mockito:mockito-inline:3.12.4=integTestCompileClasspath,integTestRuntimeClasspath,testCompileClasspath,testRuntimeClasspath
 org.objenesis:objenesis:3.2=integTestCompileClasspath,integTestRuntimeClasspath,testCompileClasspath,testRuntimeClasspath
 org.opentest4j:opentest4j:1.3.0=integTestCompileClasspath,integTestRuntimeClasspath,testCompileClasspath,testRuntimeClasspath
+org.spockframework:spock-core:2.3-groovy-4.0=integTestCompileClasspath,integTestRuntimeClasspath
 uk.org.webcompere:system-stubs-core:2.0.1=integTestCompileClasspath,integTestRuntimeClasspath,testCompileClasspath,testRuntimeClasspath
 uk.org.webcompere:system-stubs-junit4:2.0.1=integTestCompileClasspath,integTestRuntimeClasspath,testCompileClasspath,testRuntimeClasspath
 empty=annotationProcessor,integTestAnnotationProcessor,testAnnotationProcessor

src/integTest/groovy/com/moowork/gradle/AbstractIntegTest.groovy

@@ -4,21 +4,20 @@ import org.apache.commons.io.FileUtils
 import org.gradle.testkit.runner.BuildResult
 import org.gradle.testkit.runner.BuildTask
 import org.gradle.testkit.runner.GradleRunner
-import org.junit.Rule
-import org.junit.rules.TemporaryFolder
 import spock.lang.Specification
+import spock.lang.TempDir
 
 abstract class AbstractIntegTest
         extends Specification {
-    @Rule
-    final TemporaryFolder temporaryFolder = new TemporaryFolder();
+    @TempDir
+    File temporaryFolder
 
     def File projectDir;
 
     def File buildFile;
 
     def setup() {
-        this.projectDir = this.temporaryFolder.root;
+        this.projectDir = this.temporaryFolder;
         this.buildFile = createFile('build.gradle')
         // Enable configuration cache :)
         new File(projectDir, 'gradle.properties') << '''org.gradle.configuration-cache=true'''.stripIndent()
@@ -53,7 +52,7 @@ abstract class AbstractIntegTest
     }
 
     protected final File createFile(final String name) {
-        return new File(this.temporaryFolder.getRoot(), name);
+        return new File(this.temporaryFolder, name);
     }
 
     protected final void writeFile(final String name, final String text) {