https://github.com/google/guava/guava: Guava is a suite of core and expanded libraries that include utility classes, google's collections, io classes, and much much more. 
public interface com.google.common.annotations.VisibleForTesting extends java.lang.annotation.Annotation
  minor version: 0
  major version: 59
  flags: flags: (0x2601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT, ACC_ANNOTATION
  this_class: com.google.common.annotations.VisibleForTesting
  super_class: java.lang.Object
{
}
SourceFile: "VisibleForTesting.java"
    RuntimeInvisibleAnnotations: 
      com.google.common.annotations.GwtCompatible()