### Question:
ASTDbPath extends ASTPath { @Override public void appendAsString(Appendable out) throws IOException { out.append(DB_PREFIX).append(path); } ASTDbPath(int id);  ASTDbPath();  ASTDbPath(Object value); @Override Expression shallowCopy(); @Override void appendAsEJBQL(List<Object> parameterAccumulator, Appendable out, String rootId); @Override void appendAsString(Appendable out); @Override int getType(); static final String DB_PREFIX; }### Answer:
@Test public void testAppendAsString() throws IOException { StringBuilder buffer = new StringBuilder(); new ASTDbPath("x.y").appendAsString(buffer); assertEquals("db:x.y", buffer.toString()); }