Make core auto-configuration tests more independent

Closes gh-44513

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/AutoConfigurationImportSelectorTests.java

@@ -29,10 +29,8 @@ import org.springframework.beans.factory.BeanFactory;
 import org.springframework.beans.factory.BeanFactoryAware;
 import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
 import org.springframework.beans.factory.support.DefaultListableBeanFactory;
-import org.springframework.boot.autoconfigure.freemarker.FreeMarkerAutoConfiguration;
-import org.springframework.boot.autoconfigure.mustache.MustacheAutoConfiguration;
-import org.springframework.boot.autoconfigure.thymeleaf.ThymeleafAutoConfiguration;
 import org.springframework.boot.context.annotation.ImportCandidates;
+import org.springframework.boot.testsupport.classpath.resources.WithResource;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.core.io.DefaultResourceLoader;
 import org.springframework.core.type.AnnotationMetadata;
@@ -48,6 +46,15 @@ import static org.assertj.core.api.Assertions.assertThatIllegalStateException;
  * @author Stephane Nicoll
  * @author Madhura Bhave
  */
+@WithResource(name = "META-INF/spring/org.springframework.boot.autoconfigure.AutoConfiguration.imports", content = """
+		com.example.one.FirstAutoConfiguration
+		com.example.two.SecondAutoConfiguration
+		com.example.three.ThirdAutoConfiguration
+		com.example.four.FourthAutoConfiguration
+		com.example.five.FifthAutoConfiguration
+		com.example.six.SixthAutoConfiguration
+		org.springframework.boot.autoconfigure.AutoConfigurationImportSelectorTests$SeventhAutoConfiguration
+		""")
 class AutoConfigurationImportSelectorTests {
 
 	private final TestAutoConfigurationImportSelector importSelector = new TestAutoConfigurationImportSelector();
@@ -63,6 +70,7 @@ class AutoConfigurationImportSelectorTests {
 		this.importSelector.setBeanFactory(this.beanFactory);
 		this.importSelector.setEnvironment(this.environment);
 		this.importSelector.setResourceLoader(new DefaultResourceLoader());
+		this.importSelector.setBeanClassLoader(Thread.currentThread().getContextClassLoader());
 	}
 
 	@Test
@@ -77,7 +85,7 @@ class AutoConfigurationImportSelectorTests {
 		String[] imports = selectImports(EnableAutoConfigurationWithClassExclusions.class);
 		assertThat(imports).hasSize(getAutoConfigurationClassNames().size() - 1);
 		assertThat(this.importSelector.getLastEvent().getExclusions())
-			.contains(FreeMarkerAutoConfiguration.class.getName());
+			.contains(SeventhAutoConfiguration.class.getName());
 	}
 
 	@Test
@@ -85,7 +93,7 @@ class AutoConfigurationImportSelectorTests {
 		String[] imports = selectImports(SpringBootApplicationWithClassExclusions.class);
 		assertThat(imports).hasSize(getAutoConfigurationClassNames().size() - 1);
 		assertThat(this.importSelector.getLastEvent().getExclusions())
-			.contains(FreeMarkerAutoConfiguration.class.getName());
+			.contains(SeventhAutoConfiguration.class.getName());
 	}
 
 	@Test
@@ -93,7 +101,7 @@ class AutoConfigurationImportSelectorTests {
 		String[] imports = selectImports(EnableAutoConfigurationWithClassNameExclusions.class);
 		assertThat(imports).hasSize(getAutoConfigurationClassNames().size() - 1);
 		assertThat(this.importSelector.getLastEvent().getExclusions())
-			.contains(MustacheAutoConfiguration.class.getName());
+			.contains("com.example.one.FirstAutoConfiguration");
 	}
 
 	@Test
@@ -101,36 +109,36 @@ class AutoConfigurationImportSelectorTests {
 		String[] imports = selectImports(SpringBootApplicationWithClassNameExclusions.class);
 		assertThat(imports).hasSize(getAutoConfigurationClassNames().size() - 1);
 		assertThat(this.importSelector.getLastEvent().getExclusions())
-			.contains(MustacheAutoConfiguration.class.getName());
+			.contains("com.example.three.ThirdAutoConfiguration");
 	}
 
 	@Test
 	void propertyExclusionsAreApplied() {
-		this.environment.setProperty("spring.autoconfigure.exclude", FreeMarkerAutoConfiguration.class.getName());
+		this.environment.setProperty("spring.autoconfigure.exclude", "com.example.three.ThirdAutoConfiguration");
 		String[] imports = selectImports(BasicEnableAutoConfiguration.class);
 		assertThat(imports).hasSize(getAutoConfigurationClassNames().size() - 1);
 		assertThat(this.importSelector.getLastEvent().getExclusions())
-			.contains(FreeMarkerAutoConfiguration.class.getName());
+			.contains("com.example.three.ThirdAutoConfiguration");
 	}
 
 	@Test
 	void severalPropertyExclusionsAreApplied() {
 		this.environment.setProperty("spring.autoconfigure.exclude",
-				FreeMarkerAutoConfiguration.class.getName() + "," + MustacheAutoConfiguration.class.getName());
+				"com.example.two.SecondAutoConfiguration,com.example.four.FourthAutoConfiguration");
 		testSeveralPropertyExclusionsAreApplied();
 	}
 
 	@Test
 	void severalPropertyExclusionsAreAppliedWithExtraSpaces() {
 		this.environment.setProperty("spring.autoconfigure.exclude",
-				FreeMarkerAutoConfiguration.class.getName() + " , " + MustacheAutoConfiguration.class.getName() + " ");
+				"com.example.two.SecondAutoConfiguration , com.example.four.FourthAutoConfiguration  ");
 		testSeveralPropertyExclusionsAreApplied();
 	}
 
 	@Test
 	void severalPropertyYamlExclusionsAreApplied() {
-		this.environment.setProperty("spring.autoconfigure.exclude[0]", FreeMarkerAutoConfiguration.class.getName());
-		this.environment.setProperty("spring.autoconfigure.exclude[1]", MustacheAutoConfiguration.class.getName());
+		this.environment.setProperty("spring.autoconfigure.exclude[0]", "com.example.two.SecondAutoConfiguration");
+		this.environment.setProperty("spring.autoconfigure.exclude[1]", "com.example.four.FourthAutoConfiguration");
 		testSeveralPropertyExclusionsAreApplied();
 	}
 
@@ -138,17 +146,17 @@ class AutoConfigurationImportSelectorTests {
 		String[] imports = selectImports(BasicEnableAutoConfiguration.class);
 		assertThat(imports).hasSize(getAutoConfigurationClassNames().size() - 2);
 		assertThat(this.importSelector.getLastEvent().getExclusions())
-			.contains(FreeMarkerAutoConfiguration.class.getName(), MustacheAutoConfiguration.class.getName());
+			.contains("com.example.two.SecondAutoConfiguration", "com.example.four.FourthAutoConfiguration");
 	}
 
 	@Test
 	void combinedExclusionsAreApplied() {
-		this.environment.setProperty("spring.autoconfigure.exclude", ThymeleafAutoConfiguration.class.getName());
+		this.environment.setProperty("spring.autoconfigure.exclude", "com.example.one.FirstAutoConfiguration");
 		String[] imports = selectImports(EnableAutoConfigurationWithClassAndClassNameExclusions.class);
 		assertThat(imports).hasSize(getAutoConfigurationClassNames().size() - 3);
 		assertThat(this.importSelector.getLastEvent().getExclusions()).contains(
-				FreeMarkerAutoConfiguration.class.getName(), MustacheAutoConfiguration.class.getName(),
-				ThymeleafAutoConfiguration.class.getName());
+				"com.example.one.FirstAutoConfiguration", "com.example.five.FifthAutoConfiguration",
+				SeventhAutoConfiguration.class.getName());
 	}
 
 	@Test
@@ -213,7 +221,8 @@ class AutoConfigurationImportSelectorTests {
 	}
 
 	private List<String> getAutoConfigurationClassNames() {
-		return ImportCandidates.load(AutoConfiguration.class, getClass().getClassLoader()).getCandidates();
+		return ImportCandidates.load(AutoConfiguration.class, Thread.currentThread().getContextClassLoader())
+			.getCandidates();
 	}
 
 	private final class TestAutoConfigurationImportSelector extends AutoConfigurationImportSelector {
@@ -278,23 +287,23 @@ class AutoConfigurationImportSelectorTests {
 
 	}
 
-	@EnableAutoConfiguration(exclude = FreeMarkerAutoConfiguration.class)
+	@EnableAutoConfiguration(exclude = SeventhAutoConfiguration.class)
 	private final class EnableAutoConfigurationWithClassExclusions {
 
 	}
 
-	@SpringBootApplication(exclude = FreeMarkerAutoConfiguration.class)
+	@SpringBootApplication(exclude = SeventhAutoConfiguration.class)
 	private final class SpringBootApplicationWithClassExclusions {
 
 	}
 
-	@EnableAutoConfiguration(excludeName = "org.springframework.boot.autoconfigure.mustache.MustacheAutoConfiguration")
+	@EnableAutoConfiguration(excludeName = "com.example.one.FirstAutoConfiguration")
 	private final class EnableAutoConfigurationWithClassNameExclusions {
 
 	}
 
-	@EnableAutoConfiguration(exclude = MustacheAutoConfiguration.class,
-			excludeName = "org.springframework.boot.autoconfigure.freemarker.FreeMarkerAutoConfiguration")
+	@EnableAutoConfiguration(exclude = SeventhAutoConfiguration.class,
+			excludeName = "com.example.five.FifthAutoConfiguration")
 	private final class EnableAutoConfigurationWithClassAndClassNameExclusions {
 
 	}
@@ -315,9 +324,14 @@ class AutoConfigurationImportSelectorTests {
 
 	}
 
-	@SpringBootApplication(excludeName = "org.springframework.boot.autoconfigure.mustache.MustacheAutoConfiguration")
+	@SpringBootApplication(excludeName = "com.example.three.ThirdAutoConfiguration")
 	private final class SpringBootApplicationWithClassNameExclusions {
 
 	}
 
+	@AutoConfiguration
+	static class SeventhAutoConfiguration {
+
+	}
+
 }

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/ImportAutoConfigurationImportSelectorTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2023 the original author or authors.
+ * Copyright 2012-2025 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -79,7 +79,7 @@ class ImportAutoConfigurationImportSelectorTests {
 		AnnotationMetadata annotationMetadata = getAnnotationMetadata(FromImportsFile.class);
 		String[] imports = this.importSelector.selectImports(annotationMetadata);
 		assertThat(imports).containsExactly(
-				"org.springframework.boot.autoconfigure.freemarker.FreeMarkerAutoConfiguration",
+				"org.springframework.boot.autoconfigure.ImportAutoConfigurationImportSelectorTests$ImportedAutoConfiguration",
 				"org.springframework.boot.autoconfigure.missing.MissingAutoConfiguration");
 	}
 
@@ -89,8 +89,8 @@ class ImportAutoConfigurationImportSelectorTests {
 				FromImportsFileIgnoresMissingOptionalClasses.class);
 		String[] imports = this.importSelector.selectImports(annotationMetadata);
 		assertThat(imports).containsExactly(
-				"org.springframework.boot.autoconfigure.freemarker.FreeMarkerAutoConfiguration",
-				"org.springframework.boot.autoconfigure.thymeleaf.ThymeleafAutoConfiguration");
+				"org.springframework.boot.autoconfigure.ImportAutoConfigurationImportSelectorTests$ImportedAutoConfiguration",
+				"org.springframework.boot.autoconfigure.ImportAutoConfigurationImportSelectorTests$AnotherImportedAutoConfiguration");
 	}
 
 	@Test
@@ -356,4 +356,14 @@ class ImportAutoConfigurationImportSelectorTests {
 
 	}
 
+	@AutoConfiguration
+	static class ImportedAutoConfiguration {
+
+	}
+
+	@AutoConfiguration
+	static class AnotherImportedAutoConfiguration {
+
+	}
+
 }

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/condition/ConditionEvaluationReportTests.java

@@ -16,9 +16,7 @@
 
 package org.springframework.boot.autoconfigure.condition;
 
-import java.util.ArrayList;
 import java.util.Iterator;
-import java.util.List;
 import java.util.Map;
 
 import org.junit.jupiter.api.BeforeEach;
@@ -31,6 +29,7 @@ import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
 import org.springframework.beans.factory.support.DefaultListableBeanFactory;
 import org.springframework.boot.autoconfigure.condition.ConditionEvaluationReport.ConditionAndOutcome;
 import org.springframework.boot.autoconfigure.condition.ConditionEvaluationReport.ConditionAndOutcomes;
+import org.springframework.boot.autoconfigure.condition.config.UniqueShortNameAutoConfiguration;
 import org.springframework.boot.autoconfigure.logging.ConditionEvaluationReportMessage;
 import org.springframework.boot.autoconfigure.web.servlet.MultipartAutoConfiguration;
 import org.springframework.boot.autoconfigure.web.servlet.WebMvcAutoConfiguration;
@@ -184,24 +183,6 @@ class ConditionEvaluationReportTests {
 		assertThat(outcomes).hasSize(2);
 	}
 
-	@Test
-	void duplicateOutcomes() {
-		AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(DuplicateConfig.class);
-		ConditionEvaluationReport report = ConditionEvaluationReport.get(context.getBeanFactory());
-		String autoconfigKey = MultipartAutoConfiguration.class.getName();
-		ConditionAndOutcomes outcomes = report.getConditionAndOutcomesBySource().get(autoconfigKey);
-		assertThat(outcomes).isNotNull();
-		assertThat(outcomes).hasSize(2);
-		List<String> messages = new ArrayList<>();
-		for (ConditionAndOutcome outcome : outcomes) {
-			messages.add(outcome.getOutcome().getMessage());
-		}
-		assertThat(messages).anyMatch((message) -> message.contains("@ConditionalOnClass found required classes "
-				+ "'jakarta.servlet.Servlet', 'org.springframework.web.multipart."
-				+ "support.StandardServletMultipartResolver', 'jakarta.servlet.MultipartConfigElement'"));
-		context.close();
-	}
-
 	@Test
 	void negativeOuterPositiveInnerBean() {
 		AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext();
@@ -220,13 +201,13 @@ class ConditionEvaluationReportTests {
 	@Test
 	void reportWhenSameShortNamePresentMoreThanOnceShouldUseFullyQualifiedName() {
 		AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext();
-		context.register(WebMvcAutoConfiguration.class,
+		context.register(UniqueShortNameAutoConfiguration.class,
 				org.springframework.boot.autoconfigure.condition.config.first.SampleAutoConfiguration.class,
 				org.springframework.boot.autoconfigure.condition.config.second.SampleAutoConfiguration.class);
 		context.refresh();
 		ConditionEvaluationReport report = ConditionEvaluationReport.get(context.getBeanFactory());
 		assertThat(report.getConditionAndOutcomesBySource()).containsKeys(
-				"org.springframework.boot.autoconfigure.web.servlet.WebMvcAutoConfiguration",
+				"org.springframework.boot.autoconfigure.condition.config.UniqueShortNameAutoConfiguration",
 				"org.springframework.boot.autoconfigure.condition.config.first.SampleAutoConfiguration",
 				"org.springframework.boot.autoconfigure.condition.config.second.SampleAutoConfiguration");
 		context.close();
@@ -235,17 +216,17 @@ class ConditionEvaluationReportTests {
 	@Test
 	void reportMessageWhenSameShortNamePresentMoreThanOnceShouldUseFullyQualifiedName() {
 		AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext();
-		context.register(WebMvcAutoConfiguration.class,
+		context.register(UniqueShortNameAutoConfiguration.class,
 				org.springframework.boot.autoconfigure.condition.config.first.SampleAutoConfiguration.class,
 				org.springframework.boot.autoconfigure.condition.config.second.SampleAutoConfiguration.class);
 		context.refresh();
 		ConditionEvaluationReport report = ConditionEvaluationReport.get(context.getBeanFactory());
 		String reportMessage = new ConditionEvaluationReportMessage(report).toString();
-		assertThat(reportMessage).contains("WebMvcAutoConfiguration",
+		assertThat(reportMessage).contains("UniqueShortNameAutoConfiguration",
 				"org.springframework.boot.autoconfigure.condition.config.first.SampleAutoConfiguration",
 				"org.springframework.boot.autoconfigure.condition.config.second.SampleAutoConfiguration");
 		assertThat(reportMessage)
-			.doesNotContain("org.springframework.boot.autoconfigure.web.servlet.WebMvcAutoConfiguration");
+			.doesNotContain("org.springframework.boot.autoconfigure.condition.config.UniqueShortNameAutoConfiguration");
 		context.close();
 	}
 

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/condition/config/UniqueShortNameAutoConfiguration.java

@@ -0,0 +1,32 @@
+/*
+ * Copyright 2012-2025 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.autoconfigure.condition.config;
+
+import org.springframework.boot.autoconfigure.AutoConfiguration;
+import org.springframework.boot.autoconfigure.condition.ConditionEvaluationReport;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
+
+/**
+ * Uniquely named auto-configuration for {@link ConditionEvaluationReport} tests.
+ *
+ * @author Andy Wilkinson
+ */
+@AutoConfiguration
+@ConditionalOnProperty("unique")
+public class UniqueShortNameAutoConfiguration {
+
+}

spring-boot-project/spring-boot-autoconfigure/src/test/resources/META-INF/spring/org.springframework.boot.autoconfigure.ImportAutoConfigurationImportSelectorTests$FromImportsFile.imports

@@ -1,2 +1,2 @@
-org.springframework.boot.autoconfigure.freemarker.FreeMarkerAutoConfiguration
+org.springframework.boot.autoconfigure.ImportAutoConfigurationImportSelectorTests$ImportedAutoConfiguration
 org.springframework.boot.autoconfigure.missing.MissingAutoConfiguration

spring-boot-project/spring-boot-autoconfigure/src/test/resources/META-INF/spring/org.springframework.boot.autoconfigure.ImportAutoConfigurationImportSelectorTests$FromImportsFileIgnoresMissingOptionalClasses.imports

@@ -1,3 +1,3 @@
-optional:org.springframework.boot.autoconfigure.freemarker.FreeMarkerAutoConfiguration
+optional:org.springframework.boot.autoconfigure.ImportAutoConfigurationImportSelectorTests$ImportedAutoConfiguration
 optional:org.springframework.boot.autoconfigure.missing.MissingAutoConfiguration
-org.springframework.boot.autoconfigure.thymeleaf.ThymeleafAutoConfiguration
+org.springframework.boot.autoconfigure.ImportAutoConfigurationImportSelectorTests$AnotherImportedAutoConfiguration