Compiler javac() {
      return Compiler.javac()
          .withClasspath(classpath())
          .withProcessors(new AutoFactoryProcessor())
          .withOptions(options);
    }
Config that is used for negative tests, and to update the golden files. Since those files use
{@code javax.inject}, we need a config that specifies that package.
factory/src/test/java/com/google/auto/factory/processor/AutoFactoryProcessorTest.java