Testing a Tree Parser
Be sure to define a subclass of IANTLRFrontEnd and
to declare an ANTLRTester in your test-case class.
(See the usage page for further
instructions.)
Also, test your lexer and parser first.
Making Assertions
Since the output of a tree parser is usally not an
ANTLR object requiring further processing, you should use the
normal assertX() methods of JUnit.
To do the tree parse, use treeParseAs(String):
assertEquals(new MyOwnIdentifier("foo"),
myTester.scanInput("foo").parseAs("expression").treeParseAs("program"));
This uses the same scanInput() from the lexer tests and parseAs() from the
parser tests. treeParseAs()
just takes it through the tree parser. "program" (in
this case) is the name of the production from the tree parser to
start with.