[erlang-questions] running tests with ct_run (cross target environment)

Lukas Larsson <>
Thu Oct 24 23:47:52 CEST 2013


Hello Devin,

The recommended way to run the Erlang/OTP tests is to use ts as described
in the testing howto[1].

If you want to do the testing with ct_run or erlexec you have to setup some
of the environment manually.

In your case the Erlang VM cannot find the module ts_install_cth. This is a
Common Test Hook needed by most OTP test suites to run. In the
init_per_suite log you should have seen something like this:

*** CT 2013-10-24 23:42:25.116 *** Suite Hook
Failed to start a CTH: error:{undef,
                                 [{ts_install_cth,init,
                                      [#Ref<0.0.0.1380>,[]],
                                      []},
                                  {ct_hooks,call_init,3,
                                      [{file,"ct_hooks.erl"},{line,147}]},
                                  {ct_hooks,call,4,
                                      [{file,"ct_hooks.erl"},{line,222}]},
                                  {ct_hooks,call,4,
                                      [{file,"ct_hooks.erl"},{line,209}]},
                                  {ct_hooks,call,3,
                                      [{file,"ct_hooks.erl"},{line,183}]},
                                  {ct_framework,ct_suite_init,3,

[{file,"ct_framework.erl"},{line,262}]},
                                  {test_server_sup,framework_call,4,
                                      [{file,"test_server_sup.erl"},
                                       {line,511}]},
                                  {test_server,run_test_case_eval,9,
                                      [{file,"test_server.erl"},
                                       {line,1120}]}]}

To make ct_run find that module you just have to add it to the path:

ct_run -pa /opt/myrel/tests/test_server/ -no_auto_compile -suite
../emulator_test/float_SUITE

Lukas


On Thu, Oct 24, 2013 at 6:55 PM, Devin Butterfield <
> wrote:

> Hi,
>
> I am porting OTP to an embedded platform and trying to run standard OTP
> tests on target. I am new to erlang, so apologies is this a FAQ, though I
> have not found any explanation on the web. I've tried running directly
> using ct_run and also erlexec, but the results are the same: "Error
> detected: "Failed to start CTH, see the CT Log for details"". Looking at
> the log reveal *no* details about this failure. What am I missing? See
> below for output...
>
> Thanks!
> --
> Regards, Devin
>
> Using erlexec command:
>
> ######################
> # using erlexec
> ######################
>
> root:/opt/myrel/tests/test_server> erlexec -sname test_server -rsh rsh
> -env PATH
> "/opt/myrel/tests/emulator_test:/sbin:/usr/sbin:/bin:/usr/bin:/opt/myrel/bin:/opt/myrel/erts-5.10.3/bin"
> -boot start_sasl -sasl errlog_type error -pz "/opt/
> myrel/tests/test_server" -ct_test_vars "{net_dir,\"\"}" -eval
> "ts_run:ct_run_test(\"/opt/myrel/tests/emulator_test\",
> [{suite,float_SUITE},{logdir,\"../test_server\"},{auto_compile,
> false},{config,[\"../test_server/ts.config\",\"../test_server/ts.unix.config\"]},{vars,[{verbose,0}]},batch,{scale_timetraps,true}])"
> -noinput -s erlang halt
>
> Common Test starting (cwd is /opt/myrel/tests/emulator_test)
>
> CWD set to:
> "/opt/myrel/tests/test_server/
> "
>
> TEST INFO: 1 test(s), 12 case(s) in 1 suite(s)
>
> Testing tests.emulator_test.float_SUITE: Starting test, 12 test cases
>
> - - - - - - - - - - - - - - - - - - - - - - - - - -
> Error detected: "Failed to start CTH, see the CT Log for details"
> - - - - - - - - - - - - - - - - - - - - - - - - - -
>
> Testing tests.emulator_test.float_SUITE: *** FAILED *** init_per_suite
> Testing tests.emulator_test.float_SUITE: TEST COMPLETE, 0 ok, 0 failed, 12
> skipped of 12 test cases
>
>
> Crash dump was written to: erl_crash.dump
>
>
> ###################
> # USING c_run
> ###################
>
>
> root:/opt/myrel/tests/test_server> ct_run -no_auto_compile -suite
> ../emulator_test/float_SUITE
>
> =PROGRESS REPORT==== 24-Mar-2035::03:29:17 ===
>           supervisor: {local,sasl_safe_sup}
>              started: [{pid,<0.40.0>},
>                        {name,alarm_handler},
>                        {mfargs,{alarm_handler,start_link,[]}},
>                        {restart_type,permanent},
>                        {shutdown,2000},
>                        {child_type,worker}]
>
> =PROGRESS REPORT==== 24-Mar-2035::03:29:18 ===
>           supervisor: {local,sasl_safe_sup}
>              started: [{pid,<0.41.0>},
>                        {name,overload},
>                        {mfargs,{overload,start_link,[]}},
>                        {restart_type,permanent},
>                        {shutdown,2000},
>                        {child_type,worker}]
>
> =PROGRESS REPORT==== 24-Mar-2035::03:29:18 ===
>           supervisor: {local,sasl_sup}
>              started: [{pid,<0.39.0>},
>                        {name,sasl_safe_sup},
>                        {mfargs,
>                            {supervisor,start_link,
>                                [{local,sasl_safe_sup},sasl,safe]}},
>                        {restart_type,permanent},
>                        {shutdown,infinity},
>                        {child_type,supervisor}]
>
> =PROGRESS REPORT==== 24-Mar-2035::03:29:18 ===
>           supervisor: {local,sasl_sup}
>              started: [{pid,<0.42.0>},
>                        {name,release_handler},
>                        {mfargs,{release_handler,start_link,[]}},
>                        {restart_type,permanent},
>                        {shutdown,2000},
>                        {child_type,worker}]
>
> =PROGRESS REPORT==== 24-Mar-2035::03:29:18 ===
>          application: sasl
>           started_at: 
>
>
> Common Test v1.7.3 starting (cwd is /opt/myrel/tests/test_server)
>
> Eshell V5.10.3  (abort with ^G)
> ()1>
> ()1>
> CWD set to:
> "/opt/myrel/tests/test_server/"
> ()1>
> TEST INFO: 1 test(s), 12 case(s) in 1 suite(s)
>
> ()1> Testing tests.emulator_test.float_SUITE: Starting test,
> 12 test cases
> ()1>
> - - - - - - - - - - - - - - - - - - - - - - - - - -
> Error detected: "Failed to start CTH, see the CT Log for details"
> - - - - - - - - - - - - - - - - - - - - - - - - - -
>
> ()1> Testing tests.emulator_test.float_SUITE: *** FAILED ***
> init_per_suite
> ()1> Testing tests.emulator_test.float_SUITE: TEST COMPLETE,
> 0 ok, 0 failed, 12 skipped of 12 test cases
>
> ()1>
>
>
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> 
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