added test case for issue #125

issue125_test.go

@@ -0,0 +1,37 @@
+package mergo
+
+import (
+	"encoding/json"
+	"testing"
+)
+
+var (
+	data = `{"FirstSlice":[], "SecondSlice": null}`
+)
+
+type settings struct {
+	FirstSlice  []string `json:"FirstSlice"`
+	SecondSlice []string `json:"SecondSlice"`
+}
+
+func TestIssue125MergeWithOverwrite(t *testing.T) {
+
+	defaultSettings := settings{
+		FirstSlice:  []string{},
+		SecondSlice: []string{},
+	}
+
+	var something settings
+	if err := json.Unmarshal([]byte(data), &something); err != nil {
+		t.Errorf("Error while Unmarshalling maprequest: %s", err)
+	}
+	if err := Merge(&something, defaultSettings, WithOverrideEmptySlice); err != nil {
+		t.Errorf("Error while merging: %s", err)
+	}
+	if something.FirstSlice == nil {
+		t.Error("Invalid merging first slice")
+	}
+	if something.SecondSlice == nil {
+		t.Error("Invalid merging second slice")
+	}
+}