snapshot of https://github.com/ThreeDotsLabs/watermill.git (master, 2026-09-15; blobs > 131072B omitted)

message/router/middleware/duplicator_test.go

@@ -0,0 +1,47 @@
+package middleware_test
+
+import (
+	"errors"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+
+	"github.com/ThreeDotsLabs/watermill/message"
+	"github.com/ThreeDotsLabs/watermill/message/router/middleware"
+)
+
+var (
+	someMsg = message.NewMessage("1", nil)
+)
+
+func TestDuplicator(t *testing.T) {
+	var executionsCount int
+	producedMessages, err := middleware.Duplicator(func(msg *message.Message) ([]*message.Message, error) {
+		executionsCount++
+		return []*message.Message{msg}, nil
+	})(someMsg)
+
+	assert.NoError(t, err)
+	assert.Len(t, producedMessages, 2)
+	assert.Equal(t, "1", producedMessages[0].UUID)
+	assert.Equal(t, "1", producedMessages[1].UUID)
+	assert.Equal(t, 2, executionsCount)
+}
+
+func TestDuplicator_errors(t *testing.T) {
+	_, err := middleware.Duplicator(func(msg *message.Message) ([]*message.Message, error) {
+		return nil, errors.New("some error")
+	})(someMsg)
+	assert.Error(t, err, "some error")
+
+	var wasExecuted bool
+	_, err = middleware.Duplicator(func(msg *message.Message) ([]*message.Message, error) {
+		if wasExecuted {
+			return nil, errors.New("some other error")
+		}
+
+		wasExecuted = true
+		return []*message.Message{msg}, nil
+	})(someMsg)
+	assert.Error(t, err, "some other error")
+}