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Add regression test for #248 (already passes)

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Sam Harwell 2013-05-20 13:31:47 -05:00
parent ac72875491
commit f6255bd5be
1 changed files with 29 additions and 0 deletions
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29
tool/test/org/antlr/v4/test/TestCompositeGrammars.java
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@ -681,4 +681,33 @@ public class TestCompositeGrammars extends BaseTest {
"s", "b", debug);
assertEquals("", found);
}
/**
* This is a regression test for antlr/antlr4#248 "Including grammar with
* only fragments breaks generated lexer".
* https://github.com/antlr/antlr4/issues/248
*/
@Test public void testImportLexerWithOnlyFragmentRules() {
String slave =
"lexer grammar Unicode;\n" +
"\n" +
"fragment\n" +
"UNICODE_CLASS_Zs : '\\u0020' | '\\u00A0' | '\\u1680' | '\\u180E'\n" +
" | '\\u2000'..'\\u200A'\n" +
" | '\\u202F' | '\\u205F' | '\\u3000'\n" +
" ;\n";
String master =
"grammar Test;\n" +
"import Unicode;\n" +
"\n" +
"program : 'test' 'test' ;\n" +
"\n" +
"WS : (UNICODE_CLASS_Zs)+ -> skip;\n";
mkdir(tmpdir);
writeFile(tmpdir, "Unicode.g4", slave);
String found = execParser("Test.g4", master, "TestParser", "TestLexer", "program", "test test", debug);
assertEquals("", found);
assertNull(stderrDuringParse);
}
}