Polish 'Ignore JUnit annotations when caching test contexts'

See gh-28563

spring-boot-project/spring-boot-test/src/main/java/org/springframework/boot/test/context/ImportsContextCustomizer.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2019 the original author or authors.
+ * Copyright 2012-2021 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.
@@ -386,7 +386,7 @@ class ImportsContextCustomizer implements ContextCustomizer {
 	}
 
 	/**
-	 * {@link AnnotationFilter} for Spock annotations.
+	 * {@link AnnotationFilter} for JUnit annotations.
 	 */
 	private static final class JunitAnnotationFilter implements AnnotationFilter {
 
@@ -396,4 +396,5 @@ class ImportsContextCustomizer implements ContextCustomizer {
 		}
 
 	}
+
 }

spring-boot-project/spring-boot-test/src/test/java/org/springframework/boot/test/context/ImportsContextCustomizerTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2019 the original author or authors.
+ * Copyright 2012-2021 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.
@@ -22,6 +22,8 @@ import java.util.Collections;
 import java.util.Set;
 
 import kotlin.Metadata;
+import org.junit.jupiter.api.Nested;
+import org.junit.jupiter.api.Tag;
 import org.junit.jupiter.api.Test;
 import org.spockframework.runtime.model.SpecMetadata;
 import spock.lang.Issue;
@@ -72,6 +74,12 @@ class ImportsContextCustomizerTests {
 				.isEqualTo(new ImportsContextCustomizer(SecondSpockLangAnnotatedTestClass.class));
 	}
 
+	@Test
+	void customizersForTestClassesWithDifferentJunitAnnotationsAreEqual() {
+		assertThat(new ImportsContextCustomizer(FirstJunitAnnotatedTestClass.class))
+				.isEqualTo(new ImportsContextCustomizer(SecondJunitAnnotatedTestClass.class));
+	}
+
 	@Import(TestImportSelector.class)
 	@Indicator1
 	static class FirstImportSelectorAnnotatedClass {
@@ -126,6 +134,18 @@ class ImportsContextCustomizerTests {
 
 	}
 
+	@Nested
+	@Import(TestImportSelector.class)
+	static class FirstJunitAnnotatedTestClass {
+
+	}
+
+	@Tag("test")
+	@Import(TestImportSelector.class)
+	static class SecondJunitAnnotatedTestClass {
+
+	}
+
 	@Retention(RetentionPolicy.RUNTIME)
 	@interface Indicator1 {