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Add regression test for antlr/antlr4#6 (NullPointerException in getMissingSymbol)

This commit is contained in:
Sam Harwell 2012-10-25 17:36:50 -05:00
parent d5341b55af
commit 514a1500ea
1 changed files with 18 additions and 1 deletions
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19
tool/test/org/antlr/v4/test/TestParseErrors.java
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@ -254,10 +254,27 @@ public class TestParseErrors extends BaseTest {
assertEquals(expecting, result);
}
/**
* This is a regression test for #6 "NullPointerException in getMissingSymbol".
* https://github.com/antlr/antlr4/issues/6
*/
@Test
public void testInvalidEmptyInput() throws Exception {
String grammar =
"grammar T;\n" +
"start : ID+;\n" +
"ID : [a-z]+;\n" +
"\n";
String result = execParser("T.g4", grammar, "TParser", "TLexer", "start", "", true);
String expecting = "";
assertEquals(expecting, result);
assertEquals("line 1:0 missing ID at '<EOF>'\n", this.stderrDuringParse);
}
/**
* This is a regression test for #45 "NullPointerException in ATNConfig.hashCode".
* https://github.com/antlr/antlr4/issues/45
*
* <p/>
* The original cause of this issue was an error in the tool's ATN state optimization,
* which is now detected early in {@link ATNSerializer} by ensuring that all
* serialized transitions point to states which were not removed.