Proposed rewrite of test_regex

Here is a rewritten test suite for Regex DataHandler. This rewrite aims
at being lighter, more readable, accurate.

tests/datahandlers/test_regex.py

@@ -1,56 +1,70 @@
 import unittest
 from lodel.exceptions import *
-from lodel.leapi.datahandlers.datas import Regex, Varchar, Integer
-
+from lodel.leapi.datahandlers.datas import Regex, Varchar, Integer, UniqID
+from lodel.leapi.datahandlers.base_classes import DataHandler
+from unittest.mock import Mock
+import re
 
 class RegexTestCase(unittest.TestCase):
-
-    def test_check_correct_data_value(self):
-        test_value = '126.205.255.12'
-        test_regex = Regex('^((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$',
-                           max_length=100)
-        value = test_regex._check_data_value(test_value)
-        self.assertEqual(value, test_value)
-
-    def test_check_bad_data_value(self):
-        test_regex = Regex('^((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$',
-                           max_length=15)
-        for test_value in ['800.9.10.5', 'test_string_value', '999.999.999.999']:
-            with self.assertRaises(FieldValidationError):
-                test_regex._check_data_value(test_value)
-
-    def test_check_bad_compile_regex(self):
-        test_max_length = 15
-        test_regex = Regex('^\d[a-z]+8?', max_length=15)
-        for test_value in ['cccc8']:
-            with self.assertRaises(FieldValidationError):
-                test_regex._check_data_value(test_value)
-
-    def test_check_bad_max_length(self):
-        test_max_length = 15
-        test_regex = Regex('[a-z]+8?', max_length=15)
-        for test_value in ['ccccccccccccccccccccccccccccccccc8']:
-            with self.assertRaises(FieldValidationError):
-                test_regex._check_data_value(test_value)
+                
+                
+    def test_invalid_regex_throws_TypeError(self):
+        self.assertRaises(TypeError, Regex().__init__, object)
+                
+                
+    def test_compiled_re_property_is_set(self):
+        self.assertIs(self.testee.compiled_re, re.compile(self.testee.regex))
+    
+    
+    def test_exceeding_value_length_throws_FieldValidationError(self):
+        self.assertRaises(
+            FieldValidationError,
+            self.testee._check_data_value,
+            self.valid_value*self.max_length
+        )
+        
             
-    def test_check_good_max_length(self):
-        test_max_length = 15
-        test_regex = Regex('^\d[a-z]+8?', max_length=15)
-        for test_value in ['3ccccccccc8']:
-            value = test_regex._check_data_value(test_value)
-            self.assertEqual(value, test_value)
+    def test_invalid_field_value_throws_FieldValidationError(self):
+        self.assertRaises(
+            FieldValidationError,
+            self.testee._check_data_value,
+            ''
+        )
+        
+            
+    def test_valid_field_value_is_returned(self):
+        self.assertEqual(self.valid_value, self.testee._check_data_value(self.valid_value))
+        
+        
+    def test_can_override_returns_false_if_different_datahandler_base_type(self):
+        mock = self._get_datahandler_mock()
+        mock.__class__.base_type = self.testee.base_type*2
+ 
+        self.assertFalse(self.testee.can_override(mock))
+        
+        
+    def test_can_override_returns_false_if_different_datahandler_maxlen(self):
+        mock = self._get_datahandler_mock()
+        mock.__class__.max_length = self.max_length*2
 
-    def test_can_override(self):
-        test_regex = Regex('^((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$',
-                           max_length=15)
-        for test_varchar in [Varchar(), Varchar(max_length=15), Varchar(max_length=9)]:
-            if test_regex.max_length == test_varchar.max_length:
-                self.assertTrue(test_regex.can_override(test_varchar))
-            else:
-                self.assertFalse(test_regex.can_override(test_varchar))
+        self.assertFalse(self.testee.can_override(mock))
 
-    def test_cant_override(self):
-        test_regex = Regex('^((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$',
-                           max_length=15)
-        test_int = Integer()
-        self.assertFalse(test_regex.can_override(test_int))
+        
+    def test_can_override_returns_true_if_overridable(self):
+        self.assertTrue(self.testee.can_override(self._get_datahandler_mock()))
+        
+    
+    def _get_datahandler_mock(self):
+        dataHandlerMock = Mock()
+        dataHandlerMock.__class__.base_type = self.testee.base_type
+        dataHandlerMock.__class__.max_length = self.testee.max_length
+        
+        return dataHandlerMock
+    
+    
+    def setUp(self):
+        self.max_length = 15
+        self.regex = '^((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$'
+        self.valid_value = '126.205.255.12'
+        self.testee = Regex(self.regex, self.max_length)
+