vpython: Add environment spec package.

vpython/spec/spec_test.go

Index: vpython/spec/spec_test.go
diff --git a/vpython/spec/spec_test.go b/vpython/spec/spec_test.go
new file mode 100644
index 0000000000000000000000000000000000000000..57cafe75a7745fa95473e768dcc7cc07edf66cd6
--- /dev/null
+++ b/vpython/spec/spec_test.go
@@ -0,0 +1,52 @@
+// 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 spec
+
+import (
+	"testing"
+
+	"github.com/luci/luci-go/vpython/api/vpython"
+
+	. "github.com/luci/luci-go/common/testing/assertions"
+	. "github.com/smartystreets/goconvey/convey"
+)
+
+func TestNormalizeAndHash(t *testing.T) {
+	t.Parallel()
+
+	pkgFoo := &vpython.Spec_Package{Path: "foo", Version: "1"}
+	pkgBar := &vpython.Spec_Package{Path: "bar", Version: "2"}
+	pkgBaz := &vpython.Spec_Package{Path: "baz", Version: "3"}
+
+	Convey(`Test manifest generation`, t, func() {
+		var spec vpython.Spec
+
+		Convey(`Will normalize an empty spec`, func() {
+			So(Normalize(&spec), ShouldBeNil)
+			So(spec, ShouldResemble, vpython.Spec{})
+		})
+
+		Convey(`Will normalize to sorted order.`, func() {
+			spec.Wheel = []*vpython.Spec_Package{pkgFoo, pkgBar, pkgBaz}
+			So(Normalize(&spec), ShouldBeNil)
+			So(spec, ShouldResemble, vpython.Spec{
+				Wheel: []*vpython.Spec_Package{pkgBar, pkgBaz, pkgFoo},
+			})
+
+			So(Hash(&spec), ShouldEqual, "904b958b73206e64ce267e2b6df5fa0f1223e348327dba5e9a5f6421bb42cadb")
+		})
+
+		Convey(`Will fail to normalize if there are duplicate wheels.`, func() {
+			spec.Wheel = []*vpython.Spec_Package{pkgFoo, pkgFoo, pkgBar, pkgBaz}
+			So(Normalize(&spec), ShouldErrLike, "duplicate spec entries")
+
+			// Even if the versions differ.
+			fooClone := *pkgFoo
+			fooClone.Version = "other"
+			spec.Wheel = []*vpython.Spec_Package{pkgFoo, &fooClone, pkgBar, pkgBaz}
+			So(Normalize(&spec), ShouldErrLike, "duplicate spec entries")
+		})
+	})
+}