Tidy up. More tests.

v3/internal/parser/testdata/struct_literal_multiple/main.go

@@ -20,6 +20,8 @@ type OtherService struct {
 	t int
 }
 
+func (o *OtherService) Hello() {}
+
 func main() {
 	app := application.New(application.Options{
 		Bind: []interface{}{

v3/internal/parser/testdata/struct_literal_multiple_files/other.go

@@ -3,3 +3,5 @@ package main
 type OtherService struct {
 	t int
 }
+
+func (o *OtherService) Hello() {}