Block timestampBlock = blocks.get(1);
Assert.assertTrue("Second block is not of type " +
ExtractUnixtimestamp.class.getName(), timestampBlock instanceof ExtractUnixtimestamp);
VariableSpace variables = new VariableSpace();
timestampBlock.apply(r, variables);
checkFields(variables, "year", "1963");
checkFields(variables, "month", "12");
checkFields(variables, "day", "4");
checkFields(variables, "hour", "15");