Class<PackageLoader> loaderClass = (Class<PackageLoader>) Class.forName("org.renjin.base.Loader");
PackageLoader loader = loaderClass.newInstance();
Environment baseEnv = topLevelContext.getEnvironment().getBaseEnvironment();
loader.load(topLevelContext, baseEnv);
assertThat(baseEnv.getVariable("xor").force(topLevelContext).getClass().getSimpleName(), equalTo("xor"));
assertThat(eval("xor(TRUE,TRUE)"), equalTo(c(false)));
}