Fix header and test import

Author: ascandella

internal/gps/_testdata/src/dotgodir/foo.go/foo.go

@@ -1,3 +1,12 @@
+// Copyright 2017 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 foo
 
+import "sort"
+
+var _ = sort.Strings
+
 // yes, this is dumb, don't use ".go" in your directory names
+// See https://github.com/golang/dep/issues/550 for more information

internal/gps/pkgtree/pkgtree_test.go

@@ -1296,7 +1296,7 @@ func TestListPackages(t *testing.T) {
 						P: Package{
 							ImportPath: "dotgodir/foo.go",
 							Name:       "foo",
-							Imports:    []string{},
+							Imports:    []string{"sort"},
 						},
 					},
 				},