Implemented some unit tests for the ParamRoleBackend class.

Also declared a few dummy models in order to setup a self-contained testing environment.

flexi_auth/tests/models.py

@@ -0,0 +1,71 @@
+from django.db import models
+
+from flexi_auth.models import PermissionBase
+
+class Author(models.Model):
+    name = models.CharField(max_length=50)
+    surname = models.CharField(max_length=50)
+
+class Article(models.Model):
+    title = models.CharField(max_length=50)
+    body = models.TextField()
+    author = models.ForeignKey(Author)
+
+    ##-------------- authorization API----------------##
+    # table-level CREATE permission
+    @classmethod
+    def can_create(cls, user, context):
+        if context:
+            try:
+                website = context['website']
+                edition = context['edition']
+                if (website=="BarSite" or (website=="FooSite" and edition=="morning")):
+                    return True               
+            except KeyError:
+                pass         
+        return False 
+    # row-level VIEW permission
+    def can_view (self, user, context):
+        if context:
+            try:
+                website = context['website']
+                edition = context['edition']
+                if (website=="BarSite" or (website=="FooSite" and edition=="morning")):
+                    return True               
+            except KeyError:
+                pass         
+        return False 
+    ##-------------------------------------------------##
+
+
+class Book(models.Model, PermissionBase):
+    title = models.CharField(max_length=50)
+    content = models.TextField()
+    authors = models.ManyToManyField(Author)
+
+    ##-------------- authorization API----------------##
+    # table-level CREATE permission
+    @classmethod
+    def can_create(cls, user, context):
+        if context:
+            try:
+                website = context['website']
+                edition = context['edition']
+                if (website=="BarSite" or (website=="FooSite" and edition=="morning")):
+                    return True               
+            except KeyError:
+                pass         
+        return False 
+    # row-level VIEW permission
+    def can_view (self, user, context):
+        if context:
+            try:
+                language = context['language']
+                cover = context['cover']
+                if (language=="Italian" or (language=="Dutch" and cover=="Paperback")):
+                    return True               
+            except KeyError:
+                pass         
+        return False 
+    ##-------------------------------------------------##
+