Test Boot's Gradle plugin against Gradle 7.6-rc-1

Closes gh-32933

Author: wilkinsona

spring-boot-project/spring-boot-tools/spring-boot-gradle-plugin/src/main/java/org/springframework/boot/gradle/tasks/bundling/Closures.java

@@ -18,10 +18,20 @@
 
 import groovy.lang.Closure;
 import org.gradle.api.Action;
+import org.gradle.util.GradleVersion;
 
 /**
- * Wrapper for the deprecated {@link org.gradle.util.ConfigureUtil} that allows
- * deprecation warnings to be suppressed in a single, focused location.
+ * Wrapper for {@code ConfigureUtil} that handles the API and behavior differences in the
+ * versions of Gradle that we support.
+ * <p>
+ * In Gradle 7.1 {@code org.gradle.util.ConfigureUtil} was deprecated and
+ * {@code org.gradle.util.internal.ConfigureUtil} was introduced as a replacement. In
+ * Gradle 7.6, the deprecation of {@code org.gradle.util.ConfigureUtil} was strengthened
+ * by reporting the use of deprecated API to the user.
+ * <p>
+ * To accommodate the differences, we use {@code org.gradle.util.internal.ConfigureUtil}
+ * with Gradle 7.1 and later. With earlier versions, {@code org.gradle.util.ConfigureUtil}
+ * is used. This avoids users by nagged about deprecated API usage in our plugin.
  *
  * @author Andy Wilkinson
  */
@@ -33,7 +43,10 @@ private Closures() {
 
 	@SuppressWarnings("deprecation")
 	static <T> Action<T> asAction(Closure<?> closure) {
-		return org.gradle.util.ConfigureUtil.configureUsing(closure);
+		if (GradleVersion.current().compareTo(GradleVersion.version("7.1")) < 0) {
+			return org.gradle.util.ConfigureUtil.configureUsing(closure);
+		}
+		return org.gradle.util.internal.ConfigureUtil.configureUsing(closure);
 	}
 
 }

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

@@ -34,16 +34,17 @@ private GradleVersions() {
 
 	public static List<String> allCompatible() {
 		if (isJava18()) {
-			return Arrays.asList("7.3.3", "7.4.2", GradleVersion.current().getVersion());
+			return Arrays.asList("7.3.3", "7.4.2", GradleVersion.current().getVersion(), "7.6-rc-1");
 		}
 		if (isJava17()) {
-			return Arrays.asList("7.2", "7.3.3", "7.4.2", GradleVersion.current().getVersion());
+			return Arrays.asList("7.2", "7.3.3", "7.4.2", GradleVersion.current().getVersion(), "7.6-rc-1");
 		}
 		if (isJava16()) {
-			return Arrays.asList("7.0.2", "7.1", "7.2", "7.3.3", "7.4.2", GradleVersion.current().getVersion());
+			return Arrays.asList("7.0.2", "7.1", "7.2", "7.3.3", "7.4.2", GradleVersion.current().getVersion(),
+					"7.6-rc-1");
 		}
 		return Arrays.asList("6.8.3", "6.9.3", "7.0.2", "7.1.1", "7.2", "7.3.3", "7.4.2",
-				GradleVersion.current().getVersion());
+				GradleVersion.current().getVersion(), "7.6-rc-1");
 	}
 
 	public static String minimumCompatible() {