Add a munger for header lines

cmd/mungedocs/headers_test.go

@@ -0,0 +1,71 @@
+/*
+Copyright 2015 The Kubernetes Authors All rights reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package main
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestHeaderLines(t *testing.T) {
+	var cases = []struct {
+		in  string
+		out string
+	}{
+		{"", ""},
+		{
+			"# ok",
+			"# ok",
+		},
+		{
+			"## ok",
+			"## ok",
+		},
+		{
+			"##### ok",
+			"##### ok",
+		},
+		{
+			"##fix",
+			"## fix",
+		},
+		{
+			"foo\n\n##fix\n\nbar",
+			"foo\n\n## fix\n\nbar",
+		},
+		{
+			"foo\n##fix\nbar",
+			"foo\n\n## fix\n\nbar",
+		},
+		{
+			"foo\n```\n##fix\n```\nbar",
+			"foo\n```\n##fix\n```\nbar",
+		},
+		{
+			"foo\n#fix1\n##fix2\nbar",
+			"foo\n\n# fix1\n\n## fix2\n\nbar",
+		},
+	}
+	for i, c := range cases {
+		actual, err := checkHeaderLines("filename.md", []byte(c.in))
+		assert.NoError(t, err)
+		if string(actual) != c.out {
+			t.Errorf("case[%d]: expected %q got %q", i, c.out, string(actual))
+		}
+	}
+}