Added tests demonstrating that filtering lookup expression that involve model with inheritance schemes aren't incorrectly blacklisted by the r15031 security fix. Refs. #15032.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@15178 bcc190cf-cafb-0310-a4f2-bffc1f526a37

tests/regressiontests/admin_views/models.py

@@ -615,6 +615,17 @@ class Album(models.Model):
 class AlbumAdmin(admin.ModelAdmin):
     list_filter = ['title']
 
+class Employee(Person):
+    code = models.CharField(max_length=20)
+
+class WorkHour(models.Model):
+    datum = models.DateField()
+    employee = models.ForeignKey(Employee)
+
+class WorkHourAdmin(admin.ModelAdmin):
+    list_display = ('datum', 'employee')
+    list_filter = ('employee',)
+
 admin.site.register(Article, ArticleAdmin)
 admin.site.register(CustomArticle, CustomArticleAdmin)
 admin.site.register(Section, save_as=True, inlines=[ArticleInline])
@@ -646,6 +657,7 @@ admin.site.register(Plot)
 admin.site.register(PlotDetails)
 admin.site.register(CyclicOne)
 admin.site.register(CyclicTwo)
+admin.site.register(WorkHour, WorkHourAdmin)
 
 # We intentionally register Promo and ChapterXtra1 but not Chapter nor ChapterXtra2.
 # That way we cover all four cases: