fixed tests

diff/required_diff.go

@@ -1,22 +1,34 @@
 package diff
 
-// RequiredPropertiesDiff describes the changes between a pair of lists of Required Properties
+// RequiredPropertiesDiff describes the changes between a pair of lists of required properties
 type RequiredPropertiesDiff struct {
-	*StringsDiff
+	StringsDiff
+}
+
+// Empty indicates whether a change was found in this element
+func (diff *RequiredPropertiesDiff) Empty() bool {
+	if diff == nil {
+		return true
+	}
+
+	return diff.StringsDiff.Empty()
 }
 
 func (diff *RequiredPropertiesDiff) removeNonBreaking() {
 	if diff.Empty() {
 		return
 	}
 
+	if diff.StringsDiff.Empty() {
+		return
+	}
+
 	diff.Deleted = nil
 }
 
 func getRequiredPropertiesDiff(config *Config, strings1, strings2 StringList) *RequiredPropertiesDiff {
-	diff := &RequiredPropertiesDiff{
-		StringsDiff: getStringsDiff(strings1, strings2),
-	}
+
+	diff := getRequiredPropertiesDiffInternal(strings1, strings2)
 
 	if config.BreakingOnly {
 		diff.removeNonBreaking()
@@ -28,3 +40,12 @@ func getRequiredPropertiesDiff(config *Config, strings1, strings2 StringList) *R
 
 	return diff
 }
+
+func getRequiredPropertiesDiffInternal(strings1, strings2 StringList) *RequiredPropertiesDiff {
+	if stringsDiff := getStringsDiff(strings1, strings2); stringsDiff != nil {
+		return &RequiredPropertiesDiff{
+			StringsDiff: *stringsDiff,
+		}
+	}
+	return nil
+}