milo: dedup testdata

appengine/cmd/milo/buildbucket/builder.go

 // Copyright 2016 The LUCI Authors. All rights reserved.
 // Use of this source code is governed under the Apache License, Version 2.0
 // that can be found in the LICENSE file.
 
 package buildbucket
 
 import (
         "encoding/json"
         "fmt"
         "net/url"
@@ skipping 165 matching lines @@
                         if strings.HasSuffix(beforeBuildNumber, pattern) && err == nil {
                                 result.Link.Label = buildNumberStr
                         }
                 }
         }
 
         return result
 }
 
 func getDebugBuilds(c context.Context, bucket, builder string, maxCompletedBuilds int, target *resp.Builder) error {
-        resFile, err := os.Open(filepath.Join("testdata", "buildbucket", bucket, builder+".json"))
+        // ../buildbucket below assumes that
+        // - this code is not executed by tests outside of this dir
+        // - this dir is a sibling of frontend dir
+        resFile, err := os.Open(filepath.Join("..", "buildbucket", "testdata", bucket, builder+".json"))
         if err != nil {
                 return err
         }
         defer resFile.Close()
 
         res := &buildbucket.ApiSearchResponseMessage{}
         if err := json.NewDecoder(resFile).Decode(res); err != nil {
                 return err
         }
 
@@ skipping 72 matching lines @@
         return time.Unix(microseconds/1e6, microseconds%1e6*1000).UTC()
 }
 
 type newBuildsFirst []*resp.BuildSummary
 
 func (a newBuildsFirst) Len() int      { return len(a) }
 func (a newBuildsFirst) Swap(i, j int) { a[i], a[j] = a[j], a[i] }
 func (a newBuildsFirst) Less(i, j int) bool {
         return a[i].PendingTime.Started.After(a[j].PendingTime.Started)
 }