1 files changed, 79 insertions, 0 deletions
diff --git a/src/go/ast/ast_test.go b/src/go/ast/ast_test.go
new file mode 100644
index 0000000..71b2d6c
--- /dev/null
+++ b/src/go/ast/ast_test.go
@@ -0,0 +1,79 @@
+// Copyright 2012 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 ast
+
+import (
+	"testing"
+)
+
+var comments = []struct {
+	list []string
+	text string
+}{
+	{[]string{"//"}, ""},
+	{[]string{"//   "}, ""},
+	{[]string{"//", "//", "//   "}, ""},
+	{[]string{"// foo   "}, "foo\n"},
+	{[]string{"//", "//", "// foo"}, "foo\n"},
+	{[]string{"// foo  bar  "}, "foo  bar\n"},
+	{[]string{"// foo", "// bar"}, "foo\nbar\n"},
+	{[]string{"// foo", "//", "//", "//", "// bar"}, "foo\n\nbar\n"},
+	{[]string{"// foo", "/* bar */"}, "foo\n bar\n"},
+	{[]string{"//", "//", "//", "// foo", "//", "//", "//"}, "foo\n"},
+
+	{[]string{"/**/"}, ""},
+	{[]string{"/*   */"}, ""},
+	{[]string{"/**/", "/**/", "/*   */"}, ""},
+	{[]string{"/* Foo   */"}, " Foo\n"},
+	{[]string{"/* Foo  Bar  */"}, " Foo  Bar\n"},
+	{[]string{"/* Foo*/", "/* Bar*/"}, " Foo\n Bar\n"},
+	{[]string{"/* Foo*/", "/**/", "/**/", "/**/", "// Bar"}, " Foo\n\nBar\n"},
+	{[]string{"/* Foo*/", "/*\n*/", "//", "/*\n*/", "// Bar"}, " Foo\n\nBar\n"},
+	{[]string{"/* Foo*/", "// Bar"}, " Foo\nBar\n"},
+	{[]string{"/* Foo\n Bar*/"}, " Foo\n Bar\n"},
+
+	{[]string{"// foo", "//go:noinline", "// bar", "//:baz"}, "foo\nbar\n:baz\n"},
+	{[]string{"// foo", "//lint123:ignore", "// bar"}, "foo\nbar\n"},
+}
+
+func TestCommentText(t *testing.T) {
+	for i, c := range comments {
+		list := make([]*Comment, len(c.list))
+		for i, s := range c.list {
+			list[i] = &Comment{Text: s}
+		}
+
+		text := (&CommentGroup{list}).Text()
+		if text != c.text {
+			t.Errorf("case %d: got %q; expected %q", i, text, c.text)
+		}
+	}
+}
+
+var isDirectiveTests = []struct {
+	in string
+	ok bool
+}{
+	{"abc", false},
+	{"go:inline", true},
+	{"Go:inline", false},
+	{"go:Inline", false},
+	{":inline", false},
+	{"lint:ignore", true},
+	{"lint:1234", true},
+	{"1234:lint", true},
+	{"go: inline", false},
+	{"go:", false},
+	{"go:*", false},
+	{"go:x*", true},
+}
+
+func TestIsDirective(t *testing.T) {
+	for _, tt := range isDirectiveTests {
+		if ok := isDirective(tt.in); ok != tt.ok {
+			t.Errorf("isDirective(%q) = %v, want %v", tt.in, ok, tt.ok)
+		}
+	}
+}