[erlang-questions] Common Test and base applications

Ahmed Omar <>
Mon Feb 13 11:44:17 CET 2012


I tried to reproduce it using same steps, but i get this when i use
ct:pal("~p",[application:which_applications()])
i get

*** User  2012-02-13 11:39:24.901 ***
[{crypto,"CRYPTO version 2","2.0.4"},
 {stdlib,"ERTS  CXC 138 10","1.17.5"},
 {kernel,"ERTS  CXC 138 10","2.14.5"}]

maybe i'm doing something different..

i'm using Erlang R14B04 (erts-5.8.5)

On Sun, Feb 12, 2012 at 4:59 PM, Fred Hebert <> wrote:

> I start them with distributed test specifications:
>
> {node, master, ''}.
> {node, a, ''}.
> {node, b, ''}.
>
> {init, a, [{node_start, [{monitor_master, true},
>                          {boot_timeout, 10},
>                          {startup_functions, [{application,start,[crypto]},
>
> {application,start,[m8ball]}]},
>                          {erl_flags, "-pa
> /Users/ferd/code/self/learn-you-some-erlang/m8ball/ebin/"
>                                      "-config
> dist_m8ball_SUITE_data/main.config"}]}]}.
> {init, b, [{node_start, [{monitor_master, true},
>                          {boot_timeout, 10},
>                          {startup_functions,
> [{application,start,[crypto]},
>
> {application,start,[m8ball]}]},
>                          {erl_flags, "-pa
> /Users/ferd/code/self/learn-you-some-erlang/m8ball/ebin/ "
>                                      "-config
> dist_m8ball_SUITE_data/backup.config"}]}]}.
>
> And I start it with:
>
> $ erl -name ct -pa ../ebin/
> Erlang R15B (erts-5.9) [source] [64-bit] [smp:4:4] [async-threads:0]
> [hipe] [kernel-poll:false] Eshell V5.9 (abort with ^G)
>
> ()1> ct_master:run("m8ball_dist.spec").
>
> And whenever I use ct:pal("~p",[application:which_applications()]) in the
> suite, I get [] as a result. Further inspection shows that the distributed
> applications I have are read by the controllers, but stdlib and kernel are
> not started.
>
>
> On Sun, Feb 12, 2012 at 5:45 AM, Ahmed Omar <> wrote:
>
>> Hi Fred,
>> 1- How do you start the ct_slave nodes?
>> ()1> ct_slave:start(omarmb, testnode,[]).
>> {}
>> ()2> rpc:call('', application,
>> which_applications,[]).
>> [{stdlib,"ERTS  CXC 138 10","1.17.5"},
>>  {kernel,"ERTS  CXC 138 10","2.14.5"}]
>>
>> 2- You can use erl_flags to specify more options to your slave node, e.g:
>> ()3> ct_slave:start(omarmb, testnode1,[{erl_flags, "-s
>> mnesia"}]).
>> {}
>> ()4> rpc:call('', application,
>> which_applications,[]).
>> [{mnesia,"MNESIA  CXC 138 12","4.5"},
>>  {stdlib,"ERTS  CXC 138 10","1.17.5"},
>>  {kernel,"ERTS  CXC 138 10","2.14.5"}]
>>
>>  On Sun, Feb 12, 2012 at 6:22 AM, Fred Hebert <> wrote:
>>
>>>  I should specify this problem is something I noticed when using
>>> distributed tests based on ct_slave; I would suspect that local tests being
>>> run from a shell started manually do not suffer from this.
>>>
>>>
>>> On Sun, Feb 12, 2012 at 12:19 AM, Fred Hebert <>wrote:
>>>
>>>> I've recently discovered that Common Test appears to not be starting
>>>> basic applications such as kernel and stdlib, but it still starts things
>>>> like application controllers and whatnot.
>>>>
>>>> This gives me a few problems because it breaks a few behaviours such as
>>>> application:which_applications(), being able to start a few applications
>>>> (they depend on stdlib and kernel. Sstdlib depends on kernel, and manually
>>>> starting kernel fails because  a bunch of processes already have that
>>>> name).
>>>>
>>>> It will also play negatively with things like manually calling
>>>> application:set_env/3 before starting an application to configure it (after
>>>> loading it) as just starting it will overwrite all values, etc.
>>>>
>>>> This causes me a few problems because it forces me to test everything
>>>> below the application level, and I can't automate testing of things like
>>>> distributed applications and their failover/takeover mechanisms.
>>>>
>>>> Is there any workaround for these problems?
>>>>
>>>
>>>
>>> _______________________________________________
>>> erlang-questions mailing list
>>> 
>>> http://erlang.org/mailman/listinfo/erlang-questions
>>>
>>>
>>
>
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