JsonObject results = preprocessor.getResults();
assertFalse( results.get( "measurements" ).asArray().isEmpty() );
JsonObject measurement = results.get( "measurements" ).asArray().get( 0 ).asObject();
assertEquals( asList( "variables", "units", "values" ), measurement.names() );
assertTrue( measurement.get( "variables" ).asObject().names().contains( "vm" ) );
assertTrue( measurement.get( "units" ).asObject().names().contains( "ns" ) );
assertTrue( measurement.get( "values" ).asArray().get( 0 ).isNumber() );
}