test for parser within parser

tests/test_parser.py

@@ -0,0 +1,19 @@
+import unittest
+from hotxlfp import Parser
+
+
+
+class TestParser(unittest.TestCase):
+
+    def test_parser_within_parser(self):
+
+        def parse(formula):
+            parser = Parser(debug=True)
+            result = parser.parse(formula)
+            return result['result']
+
+        parser = Parser(debug=True)
+        parser.set_function('EVAL', parse)
+        first_result = parser.parse('EVAL("1+1")')['result']
+        second_result = parser.parse('EVAL("1+1")')['result']
+        self.assertEqual(first_result, second_result)