Use build instead of temp dir for Gradle TestKit directories

Closes gh-46479

spring-boot-project/spring-boot-tools/spring-boot-gradle-plugin/src/test/java/org/springframework/boot/gradle/junit/GradleCompatibilityExtension.java

@@ -32,6 +32,7 @@ import org.junit.jupiter.api.extension.TestTemplateInvocationContextProvider;
 import org.junit.platform.commons.util.AnnotationUtils;
 
 import org.springframework.boot.gradle.testkit.PluginClasspathGradleBuild;
+import org.springframework.boot.testsupport.BuildOutput;
 import org.springframework.boot.testsupport.gradle.testkit.GradleBuild;
 import org.springframework.boot.testsupport.gradle.testkit.GradleBuildExtension;
 import org.springframework.boot.testsupport.gradle.testkit.GradleVersions;
@@ -54,8 +55,8 @@ final class GradleCompatibilityExtension implements TestTemplateInvocationContex
 			.map(GradleVersion::version)
 			.collect(Collectors.toCollection(TreeSet::new))
 			.last();
-		GradleCompatibility gradleCompatibility = AnnotationUtils
-			.findAnnotation(context.getRequiredTestClass(), GradleCompatibility.class)
+		Class<?> testClass = context.getRequiredTestClass();
+		GradleCompatibility gradleCompatibility = AnnotationUtils.findAnnotation(testClass, GradleCompatibility.class)
 			.get();
 		Stream<String> gradleVersions = GRADLE_VERSIONS.stream();
 		if (StringUtils.hasText(gradleCompatibility.versionsLessThan())) {
@@ -65,10 +66,11 @@ final class GradleCompatibilityExtension implements TestTemplateInvocationContex
 		}
 		return gradleVersions.flatMap((version) -> {
 			List<TestTemplateInvocationContext> invocationContexts = new ArrayList<>();
-			invocationContexts.add(new GradleVersionTestTemplateInvocationContext(version, false));
+			BuildOutput buildOutput = new BuildOutput(testClass);
+			invocationContexts.add(new GradleVersionTestTemplateInvocationContext(version, false, buildOutput));
 			boolean configurationCache = gradleCompatibility.configurationCache();
 			if (configurationCache && GradleVersion.version(version).equals(highestVersion)) {
-				invocationContexts.add(new GradleVersionTestTemplateInvocationContext(version, true));
+				invocationContexts.add(new GradleVersionTestTemplateInvocationContext(version, true, buildOutput));
 			}
 			return invocationContexts.stream();
 		});
@@ -81,11 +83,15 @@ final class GradleCompatibilityExtension implements TestTemplateInvocationContex
 
 	private static final class GradleVersionTestTemplateInvocationContext implements TestTemplateInvocationContext {
 
+		private final BuildOutput buildOutput;
+
 		private final String gradleVersion;
 
 		private final boolean configurationCache;
 
-		GradleVersionTestTemplateInvocationContext(String gradleVersion, boolean configurationCache) {
+		GradleVersionTestTemplateInvocationContext(String gradleVersion, boolean configurationCache,
+				BuildOutput buildOutput) {
+			this.buildOutput = buildOutput;
 			this.gradleVersion = gradleVersion;
 			this.configurationCache = configurationCache;
 		}
@@ -97,7 +103,8 @@ final class GradleCompatibilityExtension implements TestTemplateInvocationContex
 
 		@Override
 		public List<Extension> getAdditionalExtensions() {
-			GradleBuild gradleBuild = new PluginClasspathGradleBuild().gradleVersion(this.gradleVersion);
+			GradleBuild gradleBuild = new PluginClasspathGradleBuild(this.buildOutput)
+				.gradleVersion(this.gradleVersion);
 			if (this.configurationCache) {
 				gradleBuild.configurationCache();
 			}

spring-boot-project/spring-boot-tools/spring-boot-gradle-plugin/src/test/java/org/springframework/boot/gradle/junit/GradleMultiDslExtension.java

@@ -27,6 +27,7 @@ import org.junit.jupiter.api.extension.TestTemplateInvocationContext;
 import org.junit.jupiter.api.extension.TestTemplateInvocationContextProvider;
 
 import org.springframework.boot.gradle.testkit.PluginClasspathGradleBuild;
+import org.springframework.boot.testsupport.BuildOutput;
 import org.springframework.boot.testsupport.gradle.testkit.Dsl;
 import org.springframework.boot.testsupport.gradle.testkit.GradleBuild;
 import org.springframework.boot.testsupport.gradle.testkit.GradleBuildExtension;
@@ -43,7 +44,8 @@ public class GradleMultiDslExtension implements TestTemplateInvocationContextPro
 
 	@Override
 	public Stream<TestTemplateInvocationContext> provideTestTemplateInvocationContexts(ExtensionContext context) {
-		return Stream.of(Dsl.values()).map(DslTestTemplateInvocationContext::new);
+		BuildOutput buildOutput = new BuildOutput(context.getRequiredTestClass());
+		return Stream.of(Dsl.values()).map((dsl) -> new DslTestTemplateInvocationContext(buildOutput, dsl));
 	}
 
 	@Override
@@ -53,15 +55,18 @@ public class GradleMultiDslExtension implements TestTemplateInvocationContextPro
 
 	private static final class DslTestTemplateInvocationContext implements TestTemplateInvocationContext {
 
+		private final BuildOutput buildOutput;
+
 		private final Dsl dsl;
 
-		DslTestTemplateInvocationContext(Dsl dsl) {
+		DslTestTemplateInvocationContext(BuildOutput buildOutput, Dsl dsl) {
+			this.buildOutput = buildOutput;
 			this.dsl = dsl;
 		}
 
 		@Override
 		public List<Extension> getAdditionalExtensions() {
-			GradleBuild gradleBuild = new PluginClasspathGradleBuild(this.dsl)
+			GradleBuild gradleBuild = new PluginClasspathGradleBuild(this.buildOutput, this.dsl)
 				.gradleVersion(GradleVersions.minimumCompatible());
 			return Arrays.asList(new GradleBuildFieldSetter(gradleBuild), new GradleBuildExtension());
 		}

spring-boot-project/spring-boot-tools/spring-boot-gradle-plugin/src/test/java/org/springframework/boot/gradle/plugin/KotlinPluginActionIntegrationTests.java

@@ -30,6 +30,7 @@ import org.junit.jupiter.api.condition.JRE;
 import org.junit.jupiter.api.extension.ExtendWith;
 
 import org.springframework.boot.gradle.testkit.PluginClasspathGradleBuild;
+import org.springframework.boot.testsupport.BuildOutput;
 import org.springframework.boot.testsupport.gradle.testkit.GradleBuild;
 import org.springframework.boot.testsupport.gradle.testkit.GradleBuildExtension;
 
@@ -44,7 +45,7 @@ import static org.assertj.core.api.Assertions.assertThat;
 @ExtendWith(GradleBuildExtension.class)
 class KotlinPluginActionIntegrationTests {
 
-	GradleBuild gradleBuild = new PluginClasspathGradleBuild();
+	GradleBuild gradleBuild = new PluginClasspathGradleBuild(new BuildOutput(getClass()));
 
 	@Test
 	void noKotlinVersionPropertyWithoutKotlinPlugin() {

spring-boot-project/spring-boot-tools/spring-boot-gradle-plugin/src/test/java/org/springframework/boot/gradle/testkit/PluginClasspathGradleBuild.java

@@ -43,6 +43,7 @@ import org.tomlj.Toml;
 import org.springframework.asm.ClassVisitor;
 import org.springframework.boot.buildpack.platform.build.BuildRequest;
 import org.springframework.boot.loader.tools.LaunchScript;
+import org.springframework.boot.testsupport.BuildOutput;
 import org.springframework.boot.testsupport.gradle.testkit.Dsl;
 import org.springframework.boot.testsupport.gradle.testkit.GradleBuild;
 
@@ -55,12 +56,12 @@ import org.springframework.boot.testsupport.gradle.testkit.GradleBuild;
  */
 public class PluginClasspathGradleBuild extends GradleBuild {
 
-	public PluginClasspathGradleBuild() {
-		super();
+	public PluginClasspathGradleBuild(BuildOutput buildOutput) {
+		super(buildOutput);
 	}
 
-	public PluginClasspathGradleBuild(Dsl dsl) {
-		super(dsl);
+	public PluginClasspathGradleBuild(BuildOutput buildOutput, Dsl dsl) {
+		super(buildOutput, dsl);
 	}
 
 	@Override

spring-boot-project/spring-boot-tools/spring-boot-gradle-test-support/build.gradle

@@ -21,6 +21,8 @@ plugins {
 description = "Spring Boot Gradle Testing Support"
 
 dependencies {
+	api(project(":spring-boot-project:spring-boot-tools:spring-boot-test-support"))
+
 	compileOnly("org.junit.jupiter:junit-jupiter")
 
 	implementation(gradleTestKit())

spring-boot-project/spring-boot-tools/spring-boot-gradle-test-support/src/main/java/org/springframework/boot/testsupport/gradle/testkit/GradleBuild.java

@@ -37,6 +37,7 @@ import org.gradle.testkit.runner.BuildResult;
 import org.gradle.testkit.runner.GradleRunner;
 import org.gradle.util.GradleVersion;
 
+import org.springframework.boot.testsupport.BuildOutput;
 import org.springframework.util.FileCopyUtils;
 import org.springframework.util.FileSystemUtils;
 
@@ -51,6 +52,8 @@ import static org.assertj.core.api.Assertions.fail;
  */
 public class GradleBuild {
 
+	private final BuildOutput buildOutput;
+
 	private final Dsl dsl;
 
 	private File projectDir;
@@ -71,11 +74,12 @@ public class GradleBuild {
 
 	private final Map<String, String> scriptProperties = new HashMap<>();
 
-	public GradleBuild() {
-		this(Dsl.GROOVY);
+	public GradleBuild(BuildOutput buildOutput) {
+		this(buildOutput, Dsl.GROOVY);
 	}
 
-	protected GradleBuild(Dsl dsl) {
+	protected GradleBuild(BuildOutput buildOutput, Dsl dsl) {
+		this.buildOutput = buildOutput;
 		this.dsl = dsl;
 	}
 
@@ -202,10 +206,10 @@ public class GradleBuild {
 	}
 
 	private File getTestKitDir() {
-		File temp = new File(System.getProperty("java.io.tmpdir"));
-		String username = System.getProperty("user.name");
+		File build = this.buildOutput.getRootLocation();
+		File testKitRoot = new File(build, "gradle-test-kit");
 		String gradleVersion = (this.gradleVersion != null) ? this.gradleVersion : "default";
-		return new File(temp, ".gradle-test-kit-" + username + "-" + getBootVersion() + "-" + gradleVersion);
+		return new File(testKitRoot, gradleVersion).getAbsoluteFile();
 	}
 
 	public File getProjectDir() {

spring-boot-system-tests/spring-boot-image-tests/src/systemTest/java/org/springframework/boot/image/junit/GradleBuildInjectionExtension.java

@@ -21,6 +21,7 @@ import java.lang.reflect.Field;
 import org.junit.jupiter.api.extension.BeforeEachCallback;
 import org.junit.jupiter.api.extension.ExtensionContext;
 
+import org.springframework.boot.testsupport.BuildOutput;
 import org.springframework.boot.testsupport.gradle.testkit.GradleBuild;
 import org.springframework.boot.testsupport.gradle.testkit.GradleVersions;
 import org.springframework.util.Assert;
@@ -34,21 +35,22 @@ import org.springframework.util.ReflectionUtils;
  */
 public class GradleBuildInjectionExtension implements BeforeEachCallback {
 
-	private final GradleBuild gradleBuild;
+	private final String bootVersion;
 
 	GradleBuildInjectionExtension() {
-		this.gradleBuild = new GradleBuild();
-		this.gradleBuild.gradleVersion(GradleVersions.minimumCompatible());
 		String bootVersion = System.getProperty("springBootVersion");
 		Assert.notNull(bootVersion, "Property 'springBootVersion' must be set in build environment");
-		this.gradleBuild.bootVersion(bootVersion);
+		this.bootVersion = bootVersion;
 	}
 
 	@Override
 	public void beforeEach(ExtensionContext context) throws Exception {
+		GradleBuild gradleBuild = new GradleBuild(new BuildOutput(context.getRequiredTestClass()))
+			.gradleVersion(GradleVersions.minimumCompatible())
+			.bootVersion(this.bootVersion);
 		Field field = ReflectionUtils.findField(context.getRequiredTestClass(), "gradleBuild");
 		field.setAccessible(true);
-		field.set(context.getRequiredTestInstance(), this.gradleBuild);
+		field.set(context.getRequiredTestInstance(), gradleBuild);
 	}
 
 }