--- /dev/null
+// Copyright 2018 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 godoc
+
+import (
+ "bytes"
+ "strings"
+ "testing"
+)
+
+func TestParseEBNFString(t *testing.T) {
+ var p ebnfParser
+ var buf bytes.Buffer
+ src := []byte("octal_byte_value = `\\` octal_digit octal_digit octal_digit .")
+ p.parse(&buf, src)
+
+ if strings.Contains(buf.String(), "error") {
+ t.Error(buf.String())
+ }
+}