Add unpassed test.

naive-nlu/test.py

@@ -47,6 +47,12 @@ examples = [
         "text": "a wale can swim",
         "parsed": ("has-capacity", 'wale', 'swim')
     },
+    {
+        "text": "if earth is a planet, it is big",
+        "parsed": ("implies",
+                   ("pertenence-to-group", 'earth', 'planet'),
+                   ("exists-property-with-value", 'earth', 'big')),
+    },
 ]
 
 base_knowledge = {