Make BootstrapUtils.resolveTestContextBootstrapper() public

Closes gh-28891

spring-test/src/main/java/org/springframework/test/context/BootstrapUtils.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2021 the original author or authors.
+ * Copyright 2002-2022 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.
@@ -35,6 +35,8 @@ import org.springframework.util.StringUtils;
  * {@code BootstrapUtils} is a collection of utility methods to assist with
  * bootstrapping the <em>Spring TestContext Framework</em>.
  *
+ * <p>Only intended for internal use.
+ *
  * @author Sam Brannen
  * @author Phillip Webb
  * @since 4.1
@@ -114,6 +116,27 @@ abstract class BootstrapUtils {
 		}
 	}
 
+	/**
+	 * Resolve the {@link TestContextBootstrapper} type for the supplied test class
+	 * using the default {@link BootstrapContext}, instantiate the bootstrapper,
+	 * and provide it a reference to the {@code BootstrapContext}.
+	 * <p>If the {@link BootstrapWith @BootstrapWith} annotation is present on
+	 * the test class, either directly or as a meta-annotation, then its
+	 * {@link BootstrapWith#value value} will be used as the bootstrapper type.
+	 * Otherwise, either the
+	 * {@link org.springframework.test.context.support.DefaultTestContextBootstrapper
+	 * DefaultTestContextBootstrapper} or the
+	 * {@link org.springframework.test.context.web.WebTestContextBootstrapper
+	 * WebTestContextBootstrapper} will be used, depending on the presence of
+	 * {@link org.springframework.test.context.web.WebAppConfiguration @WebAppConfiguration}.
+	 * @param testClass the test class for which the bootstrapper should be created
+	 * @return a fully configured {@code TestContextBootstrapper}
+	 * @since 6.0
+	 */
+	public static TestContextBootstrapper resolveTestContextBootstrapper(Class<?> testClass) {
+		return resolveTestContextBootstrapper(createBootstrapContext(testClass));
+	}
+
 	/**
 	 * Resolve the {@link TestContextBootstrapper} type for the test class in the
 	 * supplied {@link BootstrapContext}, instantiate it, and provide it a reference

spring-test/src/main/java/org/springframework/test/context/TestContextManager.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2021 the original author or authors.
+ * Copyright 2002-2022 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.
@@ -119,7 +119,7 @@ public class TestContextManager {
 	 * @see #TestContextManager(TestContextBootstrapper)
 	 */
 	public TestContextManager(Class<?> testClass) {
-		this(BootstrapUtils.resolveTestContextBootstrapper(BootstrapUtils.createBootstrapContext(testClass)));
+		this(BootstrapUtils.resolveTestContextBootstrapper(testClass));
 	}
 
 	/**