vpython: Add CIPD support.

vpython/cipd/cipd_test.go

Index: vpython/cipd/cipd_test.go
diff --git a/vpython/cipd/cipd_test.go b/vpython/cipd/cipd_test.go
new file mode 100644
index 0000000000000000000000000000000000000000..7baeb88d41e2884989b25cbe8bac2aedd0ad6f10
--- /dev/null
+++ b/vpython/cipd/cipd_test.go
@@ -0,0 +1,41 @@
+// 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")
+		})
+	})
+}