Archaic Soubriquet

Trying to convert a Java/EasyMock based JUnit test to Groovy in the last couple days led me to find what I think is a bug in Groovy's MockFor class . The documentation for MockFor says to use the proxyDelegateInstance method when testing Java classes, but unfortunately the delegate proxy obtained using that method is type-incompatible with the Java class you're trying to mock if that class is concrete.  It works for Groovy classes, all abstract classes, and all interfaces, but it appears to fall down when given a plain, concrete Java class.

Though I've recently come to love working with Groovy, I'm deep enough where I'm starting to see some of its warts. The one that hit me nearly right away was the nastiness about groovy.lang.GString not extending java.lang.String .  This is mainly the fault of the latter being final and not extendable, but it mea ns that GString in stances aren't automatically comparable with plain Java strings. In Groovy, string literals can be quoted using both single and double-quotes.  GString appears when you use double-quotes around a string and expand variables into it.  See " Strings and GStrings " for more information.