Add nullability annotations to module/spring-boot-test-autoconfigure

See gh-46587

Author: mhalbritter

module/spring-boot-test-autoconfigure/src/main/java/org/springframework/boot/test/autoconfigure/OnFailureConditionReportContextCustomizerFactory.java

@@ -19,6 +19,8 @@
 import java.util.List;
 import java.util.function.Supplier;
 
+import org.jspecify.annotations.Nullable;
+
 import org.springframework.boot.autoconfigure.condition.ConditionEvaluationReport;
 import org.springframework.boot.autoconfigure.logging.ConditionEvaluationReportMessage;
 import org.springframework.boot.context.event.ApplicationFailedEvent;
@@ -89,7 +91,7 @@ public void onApplicationEvent(ApplicationFailedEvent event) {
 			}
 		}
 
-		private static boolean shouldPrintReport(ConfigurableApplicationContext context) {
+		private static boolean shouldPrintReport(@Nullable ConfigurableApplicationContext context) {
 			return (context == null) || context.getEnvironment()
 				.getProperty("spring.test.print-condition-evaluation-report", Boolean.class, true);
 		}

module/spring-boot-test-autoconfigure/src/main/java/org/springframework/boot/test/autoconfigure/OverrideAutoConfigurationContextCustomizerFactory.java

@@ -18,6 +18,8 @@
 
 import java.util.List;
 
+import org.jspecify.annotations.Nullable;
+
 import org.springframework.aot.AotDetector;
 import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
 import org.springframework.boot.test.util.TestPropertyValues;
@@ -37,7 +39,7 @@
 class OverrideAutoConfigurationContextCustomizerFactory implements ContextCustomizerFactory {
 
 	@Override
-	public ContextCustomizer createContextCustomizer(Class<?> testClass,
+	public @Nullable ContextCustomizer createContextCustomizer(Class<?> testClass,
 			List<ContextConfigurationAttributes> configurationAttributes) {
 		if (AotDetector.useGeneratedArtifacts()) {
 			return null;
@@ -59,7 +61,7 @@ public void customizeContext(ConfigurableApplicationContext context, MergedConte
 		}
 
 		@Override
-		public boolean equals(Object obj) {
+		public boolean equals(@Nullable Object obj) {
 			return (obj != null) && (obj.getClass() == getClass());
 		}
 

module/spring-boot-test-autoconfigure/src/main/java/org/springframework/boot/test/autoconfigure/TestSliceTestContextBootstrapper.java

@@ -18,6 +18,8 @@
 
 import java.lang.annotation.Annotation;
 
+import org.jspecify.annotations.Nullable;
+
 import org.springframework.boot.test.context.SpringBootTestContextBootstrapper;
 import org.springframework.core.ResolvableType;
 import org.springframework.core.annotation.MergedAnnotation;
@@ -40,16 +42,17 @@ public abstract class TestSliceTestContextBootstrapper<T extends Annotation> ext
 
 	@SuppressWarnings("unchecked")
 	protected TestSliceTestContextBootstrapper() {
-		this.annotationType = (Class<T>) ResolvableType.forClass(getClass())
+		Class<T> annotationType = (Class<T>) ResolvableType.forClass(getClass())
 			.as(TestSliceTestContextBootstrapper.class)
 			.getGeneric(0)
 			.resolve();
-		Assert.notNull(this.annotationType, "'%s' doesn't contain type parameter of '%s'"
-			.formatted(getClass().getName(), TestSliceTestContextBootstrapper.class.getName()));
+		Assert.notNull(annotationType, "'%s' doesn't contain type parameter of '%s'".formatted(getClass().getName(),
+				TestSliceTestContextBootstrapper.class.getName()));
+		this.annotationType = annotationType;
 	}
 
 	@Override
-	protected String[] getProperties(Class<?> testClass) {
+	protected String @Nullable [] getProperties(Class<?> testClass) {
 		MergedAnnotation<T> annotation = MergedAnnotations.search(SearchStrategy.TYPE_HIERARCHY)
 			.withEnclosingClasses(TestContextAnnotationUtils::searchEnclosingClass)
 			.from(testClass)

module/spring-boot-test-autoconfigure/src/main/java/org/springframework/boot/test/autoconfigure/actuate/observability/ObservabilityContextCustomizerFactory.java

@@ -19,6 +19,8 @@
 import java.util.List;
 import java.util.Objects;
 
+import org.jspecify.annotations.Nullable;
+
 import org.springframework.boot.test.util.TestPropertyValues;
 import org.springframework.context.ConfigurableApplicationContext;
 import org.springframework.core.env.Environment;
@@ -50,9 +52,9 @@ public ContextCustomizer createContextCustomizer(Class<?> testClass,
 
 	private static class DisableObservabilityContextCustomizer implements ContextCustomizer {
 
-		private final AutoConfigureObservability annotation;
+		private final @Nullable AutoConfigureObservability annotation;
 
-		DisableObservabilityContextCustomizer(AutoConfigureObservability annotation) {
+		DisableObservabilityContextCustomizer(@Nullable AutoConfigureObservability annotation) {
 			this.annotation = annotation;
 		}
 
@@ -85,7 +87,7 @@ private boolean isTracingDisabled(Environment environment) {
 		}
 
 		@Override
-		public boolean equals(Object o) {
+		public boolean equals(@Nullable Object o) {
 			if (this == o) {
 				return true;
 			}

module/spring-boot-test-autoconfigure/src/main/java/org/springframework/boot/test/autoconfigure/actuate/observability/package-info.java

@@ -17,4 +17,7 @@
 /**
  * Auto-configuration for handling observability in tests.
  */
+@NullMarked
 package org.springframework.boot.test.autoconfigure.actuate.observability;
+
+import org.jspecify.annotations.NullMarked;

module/spring-boot-test-autoconfigure/src/main/java/org/springframework/boot/test/autoconfigure/core/package-info.java

@@ -17,4 +17,7 @@
 /**
  * Auto-configuration for core parts common to most Spring Boot applications.
  */
+@NullMarked
 package org.springframework.boot.test.autoconfigure.core;
+
+import org.jspecify.annotations.NullMarked;

module/spring-boot-test-autoconfigure/src/main/java/org/springframework/boot/test/autoconfigure/data/cassandra/package-info.java

@@ -17,4 +17,7 @@
 /**
  * Auto-configuration for Data Cassandra tests.
  */
+@NullMarked
 package org.springframework.boot.test.autoconfigure.data.cassandra;
+
+import org.jspecify.annotations.NullMarked;

module/spring-boot-test-autoconfigure/src/main/java/org/springframework/boot/test/autoconfigure/data/couchbase/package-info.java

@@ -17,4 +17,7 @@
 /**
  * Auto-configuration for Data Couchbase tests.
  */
+@NullMarked
 package org.springframework.boot.test.autoconfigure.data.couchbase;
+
+import org.jspecify.annotations.NullMarked;

module/spring-boot-test-autoconfigure/src/main/java/org/springframework/boot/test/autoconfigure/data/elasticsearch/package-info.java

@@ -17,4 +17,7 @@
 /**
  * Auto-configuration for Data Elasticsearch tests.
  */
+@NullMarked
 package org.springframework.boot.test.autoconfigure.data.elasticsearch;
+
+import org.jspecify.annotations.NullMarked;

module/spring-boot-test-autoconfigure/src/main/java/org/springframework/boot/test/autoconfigure/data/jdbc/package-info.java

@@ -17,4 +17,7 @@
 /**
  * Auto-configuration for Data JDBC tests.
  */
+@NullMarked
 package org.springframework.boot.test.autoconfigure.data.jdbc;
+
+import org.jspecify.annotations.NullMarked;