Add "MkKeyContext" KeyContext generation function.

impl/memory/datastore_test.go

 // Copyright 2015 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 memory
 
 import (
         "errors"
         "fmt"
         "testing"
@@ skipping 82 matching lines @@
                                         "$id":   propNI(1),
                                         "$kind": propNI("Foo"),
                                 }
                                 So(ds.Get(c, pmap), ShouldBeNil)
                                 So(pmap, ShouldResemble, ds.PropertyMap{
                                         "$id":   propNI(1),
                                         "$kind": propNI("Foo"),
                                         "Name":  prop(""),
                                         "Val":   prop(10),
                                         "Multi": ds.PropertySlice{prop("foo"), prop("bar")},
-                                        "Key":   prop(ds.KeyContext{"dev~app", ""}.MakeKey("Bar", "Baz")),
+                                        "Key":   prop(ds.MkKeyContext("dev~app", "").MakeKey("Bar", "Baz")),
                                 })
                         })
                         Convey("Deleteing with a bogus key is bad", func() {
                                 So(ds.Delete(c, ds.NewKey(c, "Foo", "wat", 100, nil)), ShouldEqual, ds.ErrInvalidKey)
                         })
                         Convey("Deleteing a DNE entity is fine", func() {
                                 So(ds.Delete(c, ds.NewKey(c, "Foo", "wat", 0, nil)), ShouldBeNil)
                         })
 
                         Convey("Deleting entities from a nonexistant namespace works", func() {
@@ skipping 694 matching lines @@
                         // Add "foos" to a new namespace, then confirm that it gets indexed.
                         So(ds.Put(infoS.MustNamespace(ctx, "qux"), foos), ShouldBeNil)
                         ds.GetTestable(ctx).CatchupIndexes()
 
                         results = nil
                         So(ds.GetAll(infoS.MustNamespace(ctx, "qux"), q, &results), ShouldBeNil)
                         So(len(results), ShouldEqual, 2)
                 })
         })
 }