Add #31 as test case

analyzer/method_test.go

@@ -53,3 +53,17 @@ StringHolder.[setString string:String] = {
 }
 `)
 }
+
+func TestMethodChained (test *testing.T) {
+testString (test,
+`
+Number: Int
+
+Number.[add x:Number] = [+ [.this] x]
+Number.[sub x:Number] = [- [.this] x]
+Number.[mul x:Number] = [* [.this] x]
+Number.[div x:Number] = [/ [.this] x]
+
+[main]: Number = [~Number 5].[add 8].[mul 3]
+`)
+}