1 files changed, 71 insertions, 0 deletions
diff --git a/src/pkg/exp/ebnf/ebnf_test.go b/src/pkg/exp/ebnf/ebnf_test.go
new file mode 100644
index 000000000..8cfd6b9c3
--- /dev/null
+++ b/src/pkg/exp/ebnf/ebnf_test.go
@@ -0,0 +1,71 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package ebnf
+
+import (
+	"bytes"
+	"testing"
+)
+
+var goodGrammars = []string{
+	`Program = .`,
+
+	`Program = foo .
+	 foo = "foo" .`,
+
+	`Program = "a" | "b" "c" .`,
+
+	`Program = "a" … "z" .`,
+
+	`Program = Song .
+	 Song = { Note } .
+	 Note = Do | (Re | Mi | Fa | So | La) | Ti .
+	 Do = "c" .
+	 Re = "d" .
+	 Mi = "e" .
+	 Fa = "f" .
+	 So = "g" .
+	 La = "a" .
+	 Ti = ti .
+	 ti = "b" .`,
+}
+
+var badGrammars = []string{
+	`Program = | .`,
+	`Program = | b .`,
+	`Program = a … b .`,
+	`Program = "a" … .`,
+	`Program = … "b" .`,
+	`Program = () .`,
+	`Program = [] .`,
+	`Program = {} .`,
+}
+
+func checkGood(t *testing.T, src string) {
+	grammar, err := Parse("", bytes.NewBuffer([]byte(src)))
+	if err != nil {
+		t.Errorf("Parse(%s) failed: %v", src, err)
+		return
+	}
+	if err = Verify(grammar, "Program"); err != nil {
+		t.Errorf("Verify(%s) failed: %v", src, err)
+	}
+}
+
+func checkBad(t *testing.T, src string) {
+	_, err := Parse("", bytes.NewBuffer([]byte(src)))
+	if err == nil {
+		t.Errorf("Parse(%s) should have failed", src)
+	}
+}
+
+func TestGrammars(t *testing.T) {
+	for _, src := range goodGrammars {
+		checkGood(t, src)
+	}
+	for _, src := range badGrammars {
+		checkBad(t, src)
+	}
+}