1 files changed, 25 insertions, 10 deletions
diff --git a/libgo/go/ebnf/ebnf_test.go b/libgo/go/ebnf/ebnf_test.go
index e77cf64..b086fac 100644
--- a/libgo/go/ebnf/ebnf_test.go
+++ b/libgo/go/ebnf/ebnf_test.go
@@ -10,11 +10,9 @@ import (
 	"testing"
 )
 
-
 var fset = token.NewFileSet()
 
-
-var grammars = []string{
+var goodGrammars = []string{
 	`Program = .`,
 
 	`Program = foo .
@@ -22,7 +20,7 @@ var grammars = []string{
 
 	`Program = "a" | "b" "c" .`,
 
-	`Program = "a" ... "z" .`,
+	`Program = "a" … "z" .`,
 
 	`Program = Song .
 	 Song = { Note } .
@@ -37,8 +35,18 @@ var grammars = []string{
 	 ti = "b" .`,
 }
 
+var badGrammars = []string{
+	`Program = | .`,
+	`Program = | b .`,
+	`Program = a … b .`,
+	`Program = "a" … .`,
+	`Program = … "b" .`,
+	`Program = () .`,
+	`Program = [] .`,
+	`Program = {} .`,
+}
 
-func check(t *testing.T, filename string, src []byte) {
+func checkGood(t *testing.T, filename string, src []byte) {
 	grammar, err := Parse(fset, filename, src)
 	if err != nil {
 		t.Errorf("Parse(%s) failed: %v", src, err)
@@ -48,25 +56,32 @@ func check(t *testing.T, filename string, src []byte) {
 	}
 }
 
+func checkBad(t *testing.T, filename string, src []byte) {
+	_, err := Parse(fset, filename, src)
+	if err == nil {
+		t.Errorf("Parse(%s) should have failed", src)
+	}
+}
 
 func TestGrammars(t *testing.T) {
-	for _, src := range grammars {
-		check(t, "", []byte(src))
+	for _, src := range goodGrammars {
+		checkGood(t, "", []byte(src))
+	}
+	for _, src := range badGrammars {
+		checkBad(t, "", []byte(src))
 	}
 }
 
-
 var files = []string{
 // TODO(gri) add some test files
 }
 
-
 func TestFiles(t *testing.T) {
 	for _, filename := range files {
 		src, err := ioutil.ReadFile(filename)
 		if err != nil {
 			t.Fatal(err)
 		}
-		check(t, filename, src)
+		checkGood(t, filename, src)
 	}
 }