Added basic tests for databrowse. Refs #5968.

# Empty models.py to allow for specifying databrowse as a test label.

from django.contrib import databrowse

from django.db import models

from django.test import TestCase

class SomeModel(models.Model):

    some_field = models.CharField(max_length=50)

    def __unicode__(self):

        return self.some_field

class SomeOtherModel(models.Model):

    some_other_field = models.CharField(max_length=50)

    def __unicode__(self):

        return self.some_other_field

class YetAnotherModel(models.Model):

    yet_another_field = models.CharField(max_length=50)

    def __unicode__(self):

        return self.yet_another_field

class DatabrowseTests(TestCase):

    def test_databrowse_register_unregister(self):

        databrowse.site.register(SomeModel)

        self.assertTrue(SomeModel in databrowse.site.registry)

        databrowse.site.register(SomeOtherModel, YetAnotherModel)

        self.assertTrue(SomeOtherModel in databrowse.site.registry)

        self.assertTrue(YetAnotherModel in databrowse.site.registry)

        self.assertRaisesMessage(

            databrowse.sites.AlreadyRegistered,

            'The model SomeModel is already registered',

            databrowse.site.register, SomeModel, SomeOtherModel

        )

        databrowse.site.unregister(SomeOtherModel)

        self.assertFalse(SomeOtherModel in databrowse.site.registry)

        databrowse.site.unregister(SomeModel, YetAnotherModel)

        self.assertFalse(SomeModel in databrowse.site.registry)

        self.assertFalse(YetAnotherModel in databrowse.site.registry)

        self.assertRaisesMessage(

            databrowse.sites.NotRegistered,

            'The model SomeModel is not registered',

            databrowse.site.unregister, SomeModel, SomeOtherModel

        )

        self.assertRaisesMessage(

            databrowse.sites.AlreadyRegistered,

            'The model SomeModel is already registered',

            databrowse.site.register, SomeModel, SomeModel

        )