asp.net MVC3 Unit Testing - Role Provider -

unit testing of role provider fail.

[testmethod]     public void findusersinrole()     {         mock<iusersinrolerepository> userinrolemock = new mock<iusersinrolerepository>();         userinrolemock.setup(m => m.usersinroles).returns(new usersinrole[] {             new usersinrole { userid = guid.parse("aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa"), roleid = guid.parse("aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa") },             new usersinrole { userid = guid.parse("bbbbbbbb-bbbb-bbbb-bbbb-bbbbbbbbbbbb"), roleid = guid.parse("aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa") },             new usersinrole { userid = guid.parse("cccccccc-cccc-cccc-cccc-cccccccccccc"), roleid = guid.parse("aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa") },             new usersinrole { userid = guid.parse("dddddddd-dddd-dddd-dddd-dddddddddddd"), roleid = guid.parse("aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa") },             new usersinrole { userid = guid.parse("eeeeeeee-eeee-eeee-eeee-eeeeeeeeeeee"), roleid = guid.parse("bbbbbbbb-bbbb-bbbb-bbbb-bbbbbbbbbbbb") }         }.asqueryable());          mock<irolerepository> rolemock = new mock<irolerepository>();         rolemock.setup(m => m.roles).returns(new role[] {             new role { roleid = guid.parse("aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa"), rolename = "test" },             new role { roleid = guid.parse("bbbbbbbb-bbbb-bbbb-bbbb-bbbbbbbbbbbb"), rolename = "admin" }         }.asqueryable());          mock<iuserrepository> usermock = new mock<iuserrepository>();         usermock.setup(m => m.users).returns(new user[] {             new user { userid = guid.parse("aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa"), useraccount = "abcdef" },             new user { userid = guid.parse("bbbbbbbb-bbbb-bbbb-bbbb-bbbbbbbbbbbb"), useraccount = "bcdef" },             new user { userid = guid.parse("cccccccc-cccc-cccc-cccc-cccccccccccc"), useraccount = "cdef" },             new user { userid = guid.parse("dddddddd-dddd-dddd-dddd-dddddddddddd"), useraccount = "bcdf" },             new user { userid = guid.parse("eeeeeeee-eeee-eeee-eeee-eeeeeeeeeeee"), useraccount = "abcde" }         }.asqueryable());          roleprovider target = new roleprovider(usermock.object, rolemock.object, userinrolemock.object);          string[] result = target.findusersinrole("test", "cde");          assert.areequal(result[0], "abcdef");         assert.areequal(result[1], "bcdef");         assert.areequal(result[2], "cdef");     } 

unit test code

string[] result = target.findusersinrole("test", "cde"); <-- error

findusersinrole - gets array of user names in role user name contains specified user name match.

system.nullreferenceexception raised , try debug.

why nullreferenceexception?

ps - findusersinrole (roleprovider)

public override string[] findusersinrole(string rolename, string useraccounttomatch)     {            guid roleid = rolerepository.getrole(rolename).roleid; // roleid retrun.. nullreferenceexception          var roleinusers = (from ru in usersinrolerepository.usersinroles                           ru.roleid == roleid                           select ru.userid).toarray();          var finduserresult = (from u in userrepository.users                               roleinusers.contains(u.userid) && u.useraccount.contains(useraccounttomatch)                               select u.useraccount).toarray();          return finduserresult;     } 

your cde not fake user in mackuseraccount . return null.

try below code string[] result = target.findusersinrole("test", "abcdef"); instead of

string[] result = target.findusersinrole("test", "cde");