Rework test matrix and structure

tests/test_fields.py

@@ -0,0 +1,62 @@
+import json
+import six
+
+from django.test import SimpleTestCase
+from django.core.exceptions import ValidationError
+
+from jsignature.fields import JSignatureField
+from jsignature.forms import JSignatureField as JSignatureFormField
+
+
+class JSignatureFieldTest(SimpleTestCase):
+
+    def test_to_python_empty(self):
+        f = JSignatureField()
+        for val in ['', [], '[]']:
+            self.assertIsNone(f.to_python(val))
+
+    def test_to_python_correct_value_python(self):
+        f = JSignatureField()
+        val = [{"x": [1, 2], "y": [3, 4]}]
+        self.assertEquals(val, f.to_python(val))
+
+    def test_to_python_correct_value_json(self):
+        f = JSignatureField()
+        val = [{"x": [1, 2], "y": [3, 4]}]
+        val_str = '[{"x":[1,2], "y":[3,4]}]'
+        self.assertEquals(val, f.to_python(val_str))
+
+    def test_to_python_incorrect_value(self):
+        f = JSignatureField()
+        val = 'foo'
+        self.assertRaises(ValidationError, f.to_python, val)
+
+    def test_get_prep_value_empty(self):
+        f = JSignatureField()
+        for val in ['', [], '[]']:
+            self.assertIsNone(f.get_prep_value(val))
+
+    def test_get_prep_value_correct_values_python(self):
+        f = JSignatureField()
+        val = [{"x": [1, 2], "y": [3, 4]}]
+        val_prep = f.get_prep_value(val)
+        self.assertIsInstance(val_prep, six.string_types)
+        self.assertEquals(val, json.loads(val_prep))
+
+    def test_get_prep_value_correct_values_json(self):
+        f = JSignatureField()
+        val = [{"x": [1, 2], "y": [3, 4]}]
+        val_str = '[{"x":[1,2], "y":[3,4]}]'
+        val_prep = f.get_prep_value(val_str)
+        self.assertIsInstance(val_prep, six.string_types)
+        self.assertEquals(val, json.loads(val_prep))
+
+    def test_get_prep_value_incorrect_values(self):
+        f = JSignatureField()
+        val = type('Foo')
+        self.assertRaises(ValidationError, f.get_prep_value, val)
+
+    def test_formfield(self):
+        f = JSignatureField()
+        cls = f.formfield().__class__
+        self.assertTrue(issubclass(cls, JSignatureFormField))