[New go generator] Implement declaring unions.

mojom/generators/go/templates/structs_test.go

Index: mojom/generators/go/templates/structs_test.go
diff --git a/mojom/generators/go/templates/structs_test.go b/mojom/generators/go/templates/structs_test.go
new file mode 100644
index 0000000000000000000000000000000000000000..e42f8cb80fa1185e71b8bef0cad98d34d4155eb9
--- /dev/null
+++ b/mojom/generators/go/templates/structs_test.go
@@ -0,0 +1,55 @@
+// Copyright 2016 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 templates
+
+import (
+	"testing"
+
+	"mojom/generators/go/translator"
+)
+
+func TestStructDecl(t *testing.T) {
+	expected := `type Foo struct {
+	Alpha string
+	Beta  uint32
+}`
+
+	s := translator.StructTemplate{
+		Name: "Foo",
+		Fields: []translator.StructFieldTemplate{
+			{Name: "Alpha", Type: "string"},
+			{Name: "Beta", Type: "uint32"},
+		},
+	}
+
+	check(t, expected, "StructDecl", s)
+}
+
+func TestDecodingStructVersions(t *testing.T) {
+	expected := `var someStruct_Versions []bindings.DataHeader = []bindings.DataHeader{
+	bindings.DataHeader{80, 0},
+	bindings.DataHeader{100, 1},
+	bindings.DataHeader{120, 2},
+}`
+
+	type structVersion struct {
+		NumBytes uint32
+		Version  uint32
+	}
+
+	s := struct {
+		PrivateName string
+		Versions    []structVersion
+	}{
+		PrivateName: "someStruct",
+		Versions: []structVersion{
+			{80, 0},
+			{100, 1},
+			{120, 2},
+		},
+	}
+
+	check(t, expected, "StructVersions", s)
+}