OpenRewrite recipe to demonstrate testing cycle errors

AddDummyAnnotation.java

package dev.bitflippers;

import com.google.common.annotations.Beta;
import lombok.EqualsAndHashCode;
import org.openrewrite.ExecutionContext;
import org.openrewrite.Recipe;
import org.openrewrite.TreeVisitor;
import org.openrewrite.java.AnnotationMatcher;
import org.openrewrite.java.JavaIsoVisitor;
import org.openrewrite.java.JavaParser;
import org.openrewrite.java.JavaTemplate;
import org.openrewrite.java.tree.J;

import java.util.Comparator;

@EqualsAndHashCode(callSuper = true)
public class AddDummyAnnotation extends Recipe {
    @Override
    public String getDisplayName() {
        return "Test annotation addition recipe";
    }

    @Override
    public String getDescription() {
        return "Dummy recipe to show how the OpenRewrite recipe testing framework works with cycles.";
    }

    private static final AnnotationMatcher BETA_ANNOTATION_MATCHER = new AnnotationMatcher(Beta.class.getTypeName());

    @Beta
    @Override
    public TreeVisitor<?, ExecutionContext> getVisitor() {
        return new JavaIsoVisitor<>() {

            @Override
            public J.VariableDeclarations visitVariableDeclarations(J.VariableDeclarations multiVariable, ExecutionContext executionContext) {
                multiVariable = super.visitVariableDeclarations(multiVariable, executionContext);
                // Uncomment to resolve cycle errors
                // if (shouldAddAnnotation(multiVariable)) {
                //     return multiVariable;
                // }

                return addDummyBetaAnnotation(multiVariable);
            }

            private boolean shouldAddAnnotation(J.VariableDeclarations multiVariable) {
                return multiVariable.getLeadingAnnotations().stream()
                        .anyMatch(BETA_ANNOTATION_MATCHER::matches);
            }

            private J.VariableDeclarations addDummyBetaAnnotation(J.VariableDeclarations multiVariable) {
                maybeAddImport(Beta.class.getTypeName());

                return JavaTemplate.builder("@Beta")
                                .javaParser(JavaParser.fromJavaVersion().classpath("guava"))
                                .imports(Beta.class.getTypeName())
                                .build()
                        .apply(getCursor(), multiVariable.getCoordinates().addAnnotation(Comparator.comparing(J.Annotation::toString)));
            }
        };
    }
}