cipd: Refactor client to make it more readable.

go/src/infra/tools/cipd/local/manifest_test.go

Index: go/src/infra/tools/cipd/local/manifest_test.go
diff --git a/go/src/infra/tools/cipd/local/manifest_test.go b/go/src/infra/tools/cipd/local/manifest_test.go
new file mode 100644
index 0000000000000000000000000000000000000000..12afdf07bf15cf2d5f5d07bf759cd18a67ec23d7
--- /dev/null
+++ b/go/src/infra/tools/cipd/local/manifest_test.go
@@ -0,0 +1,45 @@
+// Copyright 2014 The Chromium 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 local
+
+import (
+	"bytes"
+	"strings"
+	"testing"
+
+	. "github.com/smartystreets/goconvey/convey"
+)
+
+func TestReadManifest(t *testing.T) {
+	var goodManifest = `{
+  "format_version": "1",
+  "package_name": "package/name"
+}`
+
+	Convey("readManifest can read valid manifest", t, func() {
+		manifest, err := readManifest(strings.NewReader(goodManifest))
+		So(manifest, ShouldResemble, Manifest{
+			FormatVersion: "1",
+			PackageName:   "package/name",
+		})
+		So(err, ShouldBeNil)
+	})
+
+	Convey("readManifest rejects invalid manifest", t, func() {
+		manifest, err := readManifest(strings.NewReader("I'm not a manifest"))
+		So(manifest, ShouldResemble, Manifest{})
+		So(err, ShouldNotBeNil)
+	})
+
+	Convey("writeManifest works", t, func() {
+		buf := &bytes.Buffer{}
+		m := Manifest{
+			FormatVersion: "1",
+			PackageName:   "package/name",
+		}
+		So(writeManifest(&m, buf), ShouldBeNil)
+		So(string(buf.Bytes()), ShouldEqual, goodManifest)
+	})
+}