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add test to verify https://github.com/antlr/antlr4/issues/1369 doesn't drop two empty alts.

This commit is contained in:
parrt 2016-11-17 13:25:41 -08:00
parent 0ffb0310d2
commit 78155af499
1 changed files with 14 additions and 0 deletions
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14
tool-testsuite/test/org/antlr/v4/test/tool/TestATNConstruction.java
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@ -365,6 +365,20 @@ public class TestATNConstruction extends BaseJavaTest {
"RuleStop_a_1-EOF->s9\n";
checkRuleATN(g, "a", expecting);
}
@Test public void testEmptyOrEmpty() throws Exception {
Grammar g = new Grammar(
"parser grammar P;\n"+
"a : | ;");
String expecting =
"RuleStart_a_0->BlockStart_4\n"+
"BlockStart_4->s2\n"+
"BlockStart_4->s3\n"+
"s2->BlockEnd_5\n"+
"s3->BlockEnd_5\n"+
"BlockEnd_5->RuleStop_a_1\n"+
"RuleStop_a_1-EOF->s6\n";
checkRuleATN(g, "a", expecting);
}
@Test public void testAStar() throws Exception {
Grammar g = new Grammar(
"parser grammar P;\n"+