diff --git a/t_fractions_test.go b/t_fractions_test.go
index 866cc84..89e64dd 100644
--- a/t_fractions_test.go
+++ b/t_fractions_test.go
@@ -33,6 +33,7 @@ func TestFractionsParser(t *testing.T) {
 		/*  19 */ {`fract("+1")`, newFraction(1, 1), nil},
 		/*  20 */ {`fract("1a")`, (*FractionType)(nil), errors.New(`strconv.ParseInt: parsing "1a": invalid syntax`)},
 		/*  21 */ {`fract(1,0)`, nil, errors.New(`fract(): division by zero`)},
+		/*  22 */ {`string(1|2)`, "1|2", nil},
 	}
 	runTestSuite(t, section, inputs)
 }