[Engine-1.21] Expose default parser (#4613)

pkg/configfilearg/defaultparser.go

@@ -7,7 +7,7 @@ import (
 	"github.com/urfave/cli"
 )
 
-var defaultParser = &Parser{
+var DefaultParser = &Parser{
 	After:         []string{"server", "agent", "etcd-snapshot:1"},
 	FlagNames:     []string{"--config", "-c"},
 	EnvName:       version.ProgramUpper + "_CONFIG_FILE",
@@ -16,7 +16,7 @@ var defaultParser = &Parser{
 }
 
 func MustParse(args []string) []string {
-	result, err := defaultParser.Parse(args)
+	result, err := DefaultParser.Parse(args)
 	if err != nil {
 		logrus.Fatal(err)
 	}

pkg/configfilearg/defaultparser_test.go

@@ -65,7 +65,7 @@ func Test_UnitMustParse(t *testing.T) {
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
-			defaultParser.DefaultConfig = tt.config
+			DefaultParser.DefaultConfig = tt.config
 			if got := MustParse(tt.args); !reflect.DeepEqual(got, tt.want) {
 				t.Errorf("MustParse() = %+v\nWant = %+v", got, tt.want)
 			}