vpython: Add CIPD support.

vpython/cipd/cipd_test.go

+// Copyright 2017 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 cipd
+
+import (
+        "bytes"
+        "testing"
+
+        "github.com/luci/luci-go/vpython/api/env"
+
+        . "github.com/smartystreets/goconvey/convey"
+)
+
+func TestWriteEnsureFile(t *testing.T) {
+        t.Parallel()
+
+        Convey(`Test manifest generation`, t, func() {
+                var buf bytes.Buffer
+
+                Convey(`Invalid packages will panic.`, func() {
+                        pkg := &env.Spec_Package{
+                                Path: "foo/bar",
+                        }
+                        So(validatePackage(pkg), ShouldNotBeNil)
+                        So(func() {
+                                _ = writeEnsureFile(&buf, []*env.Spec_Package{pkg})
+                        }, ShouldPanic)
+                })
+
+                Convey(`Can write a manifest for packages`, func() {
+                        err := writeEnsureFile(&buf, []*env.Spec_Package{
+                                &env.Spec_Package{"foo/bar", "baz"},
+                                &env.Spec_Package{"pants", "key:value"},
+                        })
+                        So(err, ShouldBeNil)
+                        So(buf.String(), ShouldResemble, "foo/bar baz\npants key:value\n")
+                })
+        })
+}