Unable to create resource content in code.

[JakeWharton]

StringSourceJavaFileObject (via forSourceString) assumes I'm creating a SOURCE object when I want to create an OTHER (resource file).

In @AutoService you use actual resources as the expected generated content. I prefer to keep both the originating source and generated sources in the actual test so everything is in one place.

String source = ""
    + "package com.example;\n"
    + "\n"
    + "import com.example.auto.resource.thingy.AutoResourceThingy;\n"
    + "\n"
    + "@AutoResourceThingy\n"
    + "public class Example {}";
JavaFileObject sourceFile = JavaFileObjects.forSourceString("com.example.Example", source);

JavaFileObject expectedSource =
    JavaFileObjects.forSourceString("META-INF/thingy/com.example.Example",
        "THINGY!");

ASSERT.about(javaSource()).that(sourceFile)
    .processedWith(autoResourceThingy())
    .compilesWithoutError()
    .and()
    .generatesFiles(expectedSource);