fix(test): add function type in the test

Author: nikolaymatrosov

test/operator/operator_test.go

@@ -55,6 +55,10 @@ func TestOperator_interface(t *testing.T) {
 	require.Equal(t, true, output)
 }
 
+type Value struct {
+	Int int
+}
+
 func TestOperator_Function(t *testing.T) {
 	env := map[string]interface{}{
 		"foo": Value{1},
@@ -67,15 +71,13 @@ func TestOperator_Function(t *testing.T) {
 		expr.Operator("+", "Add"),
 		expr.Function("Add", func(args ...interface{}) (interface{}, error) {
 			return args[0].(Value).Int + args[1].(Value).Int, nil
-		}),
+		},
+			new(func(_ Value, __ Value) int),
+		),
 	)
 	require.NoError(t, err)
 
 	output, err := expr.Run(program, env)
 	require.NoError(t, err)
 	require.Equal(t, 3, output)
 }
-
-type Value struct {
-	Int int
-}