Help needed: vendor files for Prometheus support

These are the vendor files needed for Prometheus support.
I have not been able to figure out how to do this properly with gopkg.

vendor/github.com/prometheus/procfs/buddyinfo_test.go

@@ -0,0 +1,64 @@
+// Copyright 2017 The Prometheus Authors
+// 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 procfs
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestBuddyInfo(t *testing.T) {
+	buddyInfo, err := FS("fixtures/buddyinfo/valid").NewBuddyInfo()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if want, got := "DMA", buddyInfo[0].Zone; want != got {
+		t.Errorf("want Node 0, Zone %s, got %s", want, got)
+	}
+
+	if want, got := "Normal", buddyInfo[2].Zone; want != got {
+		t.Errorf("want Node 0, Zone %s, got %s", want, got)
+	}
+
+	if want, got := 4381.0, buddyInfo[2].Sizes[0]; want != got {
+		t.Errorf("want Node 0, Zone Normal %f, got %f", want, got)
+	}
+
+	if want, got := 572.0, buddyInfo[1].Sizes[1]; want != got {
+		t.Errorf("want Node 0, Zone DMA32 %f, got %f", want, got)
+	}
+}
+
+func TestBuddyInfoShort(t *testing.T) {
+	_, err := FS("fixtures/buddyinfo/short").NewBuddyInfo()
+	if err == nil {
+		t.Errorf("expected error, but none occurred")
+	}
+
+	if want, got := "invalid number of fields when parsing buddyinfo", err.Error(); want != got {
+		t.Errorf("wrong error returned, wanted %q, got %q", want, got)
+	}
+}
+
+func TestBuddyInfoSizeMismatch(t *testing.T) {
+	_, err := FS("fixtures/buddyinfo/sizemismatch").NewBuddyInfo()
+	if err == nil {
+		t.Errorf("expected error, but none occurred")
+	}
+
+	if want, got := "mismatch in number of buddyinfo buckets", err.Error(); !strings.HasPrefix(got, want) {
+		t.Errorf("wrong error returned, wanted prefix %q, got %q", want, got)
+	}
+}