[New go generator] Implement declaring unions.

mojom/generators/go/templates/test_utils.go

Index: mojom/generators/go/templates/test_utils.go
diff --git a/mojom/generators/go/templates/declarations_test.go b/mojom/generators/go/templates/test_utils.go
similarity index 72%
rename from mojom/generators/go/templates/declarations_test.go
rename to mojom/generators/go/templates/test_utils.go
index 5b4b3329a6096069dcb38968d0a8a7cfd9463828..e0d87d1ae7f935868238176d3ad5e701ace18f1f 100644
--- a/mojom/generators/go/templates/declarations_test.go
+++ b/mojom/generators/go/templates/test_utils.go
@@ -11,7 +11,6 @@ import (
 	"testing"
 
 	"mojom/generators/go/gofmt"
-	"mojom/generators/go/translator"
 )
 
 func check(t *testing.T, expected string, template string, input interface{}) {
@@ -20,6 +19,11 @@ func check(t *testing.T, expected string, template string, input interface{}) {
 		panic(err)
 	}
 
+	expected, err := gofmt.FormatFragment(expected)
+	if err != nil {
+		panic(err)
+	}
+
 	src := buffer.String()
 	actual, err := gofmt.FormatFragment(src)
 	if err != nil {
@@ -34,20 +38,3 @@ func check(t *testing.T, expected string, template string, input interface{}) {
 		t.Fatalf(errorMsg)
 	}
 }
-
-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)
-}