1 files changed, 58 insertions, 0 deletions
diff --git a/subex/main_test.go b/subex/main_test.go
index d7424b3..673b807 100644
--- a/subex/main_test.go
+++ b/subex/main_test.go
@@ -235,6 +235,64 @@ func TestSubexMain(t *testing.T) {
 				walk.StringValue("abcdefghijklm"),
 			},
 		},
+		{
+			subex: ":(.)-",
+			input: []walk.Value {
+				walk.ArrayValue {
+					{
+						Index: 0,
+						Value: walk.NullValue{},
+					},
+				},
+			},
+			expected: []walk.Value {
+				walk.NullValue{},
+			},
+		},
+		{
+			subex: ":(.{-0}+)-",
+			input: []walk.Value {
+				walk.ArrayValue {
+					{
+						Index: 0,
+						Value: walk.NumberValue(4),
+					},
+					{
+						Index: 1,
+						Value: walk.NumberValue(-123),
+					},
+					{
+						Index: 2,
+						Value: walk.NumberValue(124),
+					},
+				},
+			},
+			expected: []walk.Value {
+				walk.NumberValue(5),
+			},
+		},
+		{
+			subex: "~(-(.)~{-0}):",
+			input: []walk.Value {
+				walk.StringValue("abc"),
+			},
+			expected: []walk.Value {
+				walk.ArrayValue {
+					{
+						Index: 0,
+						Value: walk.StringValue("a"),
+					},
+					{
+						Index: 0,
+						Value: walk.StringValue("b"),
+					},
+					{
+						Index: 0,
+						Value: walk.StringValue("c"),
+					},
+				},
+			},
+		},
 	}
 
 	for i, test := range tests {