policies: add unittests for evaluator

passbook/policies/expression/tests/test_evaluator.py

@@ -0,0 +1,58 @@
+"""evaluator tests"""
+from django.core.exceptions import ValidationError
+from django.test import TestCase
+from guardian.shortcuts import get_anonymous_user
+
+from passbook.policies.expression.evaluator import Evaluator
+from passbook.policies.types import PolicyRequest
+
+
+class TestEvaluator(TestCase):
+    """Evaluator tests"""
+
+    def setUp(self):
+        self.request = PolicyRequest(user=get_anonymous_user())
+
+    def test_valid(self):
+        """test simple value expression"""
+        template = "True"
+        evaluator = Evaluator()
+        self.assertEqual(evaluator.evaluate(template, self.request).passing, True)
+
+    def test_messages(self):
+        """test expression with message return"""
+        template = "False, 'some message'"
+        evaluator = Evaluator()
+        result = evaluator.evaluate(template, self.request)
+        self.assertEqual(result.passing, False)
+        self.assertEqual(result.messages, ("some message",))
+
+    def test_invalid_syntax(self):
+        """test invalid syntax"""
+        template = "{%"
+        evaluator = Evaluator()
+        result = evaluator.evaluate(template, self.request)
+        self.assertEqual(result.passing, False)
+        self.assertEqual(result.messages, ("tag name expected",))
+
+    def test_undefined(self):
+        """test undefined result"""
+        template = "{{ foo.bar }}"
+        evaluator = Evaluator()
+        result = evaluator.evaluate(template, self.request)
+        self.assertEqual(result.passing, False)
+        self.assertEqual(result.messages, ("'foo' is undefined",))
+
+    def test_validate(self):
+        """test validate"""
+        template = "True"
+        evaluator = Evaluator()
+        result = evaluator.validate(template)
+        self.assertEqual(result, True)
+
+    def test_validate_invalid(self):
+        """test validate"""
+        template = "{%"
+        evaluator = Evaluator()
+        with self.assertRaises(ValidationError):
+            evaluator.validate(template)