@Test
    void parameter_name_starting_with_the_internal_prefix_is_illegal() {
        String internalPrefix = ReservedWords.INTERNAL_PREFIX;
        assertLineFails(internalPrefix + "i int",
                "'" + internalPrefix + "i' cannot start with '" + internalPrefix + "'");
    }
Unit tests for DefParser.

@author hmusum
@author gjoranv
configgen/src/test/java/com/yahoo/config/codegen/DefParserTest.java