Added some unit tests for the can_override and check_data_value methods of the Varchar Datahandler

tests/datahandlers/test_varchar.py

@@ -0,0 +1,27 @@
+import unittest
+
+from lodel.leapi.datahandlers.datas import Varchar, Integer
+
+
+class VarcharTestCase(unittest.TestCase):
+
+    def test_check_data_value(self):
+        test_varchar = Varchar(max_length=10)
+
+        _, error = test_varchar._check_data_value("c" * 10)
+        self.assertIsNone(error)
+
+        _, error = test_varchar._check_data_value("c" * 9)
+        self.assertIsNone(error)
+
+        _, error = test_varchar._check_data_value("c" * 11)
+        self.assertIsNotNone(error)
+        self.assertIsInstance(error, ValueError)
+
+    def test_can_override(self):
+        test_varchar1 = Varchar()
+        test_integer = Integer()
+        test_varchar2 = Varchar()
+
+        self.assertFalse(test_varchar1.can_override(test_integer))
+        self.assertTrue(test_varchar1.can_override(test_varchar2))