Rework test matrix and structure

tests/test_mixins.py

@@ -0,0 +1,47 @@
+from datetime import date
+from django.test import TestCase
+
+from .models import JSignatureTestModel
+
+
+class JSignatureFieldsMixinTest(TestCase):
+    def test_save_create(self):
+        # If an object is created signed, signature date must be set
+        signature_value = [{"x": [1, 2], "y": [3, 4]}]
+        i = JSignatureTestModel(signature=signature_value)
+        i.save()
+        i = JSignatureTestModel.objects.get(pk=i.pk)
+        self.assertEqual(date.today(), i.signature_date.date())
+
+    def test_save_no_change(self):
+        # If signature doesn't change, signature date must not be updated
+        signature_value = [{"x": [1, 2], "y": [3, 4]}]
+        i = JSignatureTestModel(signature=signature_value)
+        i.save()
+        i.signature_date = date(2013, 1, 1)
+        i.save()
+        i = JSignatureTestModel.objects.get(pk=i.pk)
+        self.assertEqual(date(2013, 1, 1), i.signature_date.date())
+
+    def test_save_change(self):
+        # If signature changes, signature date must be updated too
+        signature_value = [{"x": [1, 2], "y": [3, 4]}]
+        new_signature_value = [{"x": [5, 6], "y": [7, 8]}]
+        i = JSignatureTestModel(signature=signature_value,
+                                signature_date=date(2013, 1, 1))
+        i.save()
+        i.signature_date = date(2013, 1, 1)
+        i.signature = new_signature_value
+        i.save()
+        i = JSignatureTestModel.objects.get(pk=i.pk)
+        self.assertEqual(date.today(), i.signature_date.date())
+
+    def test_save_none(self):
+        # If sinature is set to None, it must be the same for signature_date
+        signature_value = [{"x": [1, 2], "y": [3, 4]}]
+        i = JSignatureTestModel(signature=signature_value)
+        i.save()
+        i.signature = None
+        i.save()
+        i = JSignatureTestModel.objects.get(pk=i.pk)
+        self.assertIsNone(i.signature_date)