Fix panicing of ParseSlackAttachment for nil in attachments list (#10141)

model/slack_attachment_test.go

@@ -0,0 +1,41 @@
+package model
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestParseSlackAttachment(t *testing.T) {
+	t.Run("empty list", func(t *testing.T) {
+		post := &Post{}
+		attachments := []*SlackAttachment{}
+
+		ParseSlackAttachment(post, attachments)
+
+		expectedPost := &Post{
+			Type: POST_SLACK_ATTACHMENT,
+			Props: map[string]interface{}{
+				"attachments": []*SlackAttachment{},
+			},
+		}
+		assert.Equal(t, expectedPost, post)
+	})
+
+	t.Run("list with nil", func(t *testing.T) {
+		post := &Post{}
+		attachments := []*SlackAttachment{
+			nil,
+		}
+
+		ParseSlackAttachment(post, attachments)
+
+		expectedPost := &Post{
+			Type: POST_SLACK_ATTACHMENT,
+			Props: map[string]interface{}{
+				"attachments": []*SlackAttachment{},
+			},
+		}
+		assert.Equal(t, expectedPost, post)
+	})
+}