Skip if it is not a manifest field

internal/pkg/manifest/validate_integration_test.go

@@ -11,7 +11,6 @@ import (
 	"testing"
 
 	"github.com/aws/copilot-cli/internal/pkg/manifest"
-	"github.com/aws/copilot-cli/internal/pkg/template"
 	"github.com/stretchr/testify/require"
 )
 
@@ -69,16 +68,17 @@ func isValid(v reflect.Value) error {
 	}
 	var val validator
 	validatorType := reflect.TypeOf(&val).Elem()
-	// template.Parser is not a manifest struct.
-	var tpl template.Parser
-	templaterType := reflect.TypeOf(&tpl).Elem()
-	if !typ.Implements(templaterType) && !typ.Implements(validatorType) {
+	if !typ.Implements(validatorType) {
 		return fmt.Errorf(`%v does not implement "Validate()"`, typ)
 	}
 	if typ.Kind() != reflect.Struct {
 		return nil
 	}
-	for i := 0; i < v.NumField(); i++ {
+	for i := 0; i < typ.NumField(); i++ {
+		// Skip if it is not a manifest yaml field.
+		if string(typ.Field(i).Tag) == "" {
+			continue
+		}
 		if err := isValid(v.Field(i)); err != nil {
 			return err
 		}