diff --git a/cmd/tasker/main_test.go b/cmd/tasker/main_test.go
index 7209d62..b88ff67 100644
--- a/cmd/tasker/main_test.go
+++ b/cmd/tasker/main_test.go
@@ -3,22 +3,45 @@ package main
 import (
 	"os"
 	"testing"
+	"time"
 
 	"github.com/adhocore/gronx/pkg/tasker"
 )
 
 func TestMustGetOption(t *testing.T) {
 	old := os.Args
+	exit = func (code int) {}
 	t.Run("Main", func(t *testing.T) {
 		expect := tasker.Option{File: "../../test/taskfile.txt", Out: "../../test/out.txt"}
-		os.Args = append(os.Args, "-verbose", "-file", expect.File, "-out", expect.Out)
-		opt := mustGetOption()
-		os.Args = old
+		os.Args = append(old, "-verbose", "-file", expect.File, "-out", expect.Out)
+		mustParseOption()
 		if opt.File != expect.File {
 			t.Errorf("file: expected %v, got %v", opt.File, expect.File)
 		}
 		if opt.Out != expect.Out {
 			t.Errorf("out: expected %v, got %v", opt.Out, expect.Out)
 		}
+
+		t.Run("must parse option", func (t *testing.T) {
+			os.Args = append(old, "-verbose", "-out", expect.Out)
+			mustParseOption()
+			if opt.File != "" {
+				t.Error("opt.File must be empty "+opt.File)
+			}
+
+			os.Args = append(old, "-verbose", "-file", "invalid", "-out", expect.Out)
+			mustParseOption()
+			if opt.File != "invalid" {
+				t.Error("opt.File must be invalid")
+			}
+		})
+
+		t.Run("run", func (t *testing.T) {
+			tick = time.Second
+			os.Args = append(old, "-verbose", "-file", expect.File, "-out", expect.Out, "-until", "2")
+			main()
+		})
+
+		os.Args = old
 	})
 }