[CMake] compare two files - testing

[Michael Wild]

You're welcome!

Sorry, must have mixed "execute_process" and "custom_command"  
together...

Michael

On 6. Jul, 2009, at 16:27, James C. Sutherland wrote:

> Thank you - this was a very useful explanation!
>
> For any others who may look at this, note that
> 	execute_command
> should be
> 	execute_process
>
>
> On Jul 4, 2009, at 1:11 AM, Michael Wild wrote:
>
>>
>> On 4. Jul, 2009, at 0:56, James C. Sutherland wrote:
>>
>>> I have a test that produces output files that I would like to  
>>> compare against a "blessed" copy.  Is there a way to do this in  
>>> CMake/CTest?  This is probably a very simple thing, but I have not  
>>> figured out how to do it.
>>>
>>> I have an
>>> 	add_test( ... )
>>> that creates the test, but I am not sure how to add the diff on  
>>> the output.
>>>
>>> FYI, I am running this via "make test" - I am not yet running  
>>> ctest directly.
>>>
>>
>>
>> cmake -E compare_files file1 file2
>> cmake -E md5sum file1 ...
>>
>> where probably the former is the more appropriate for you (unless  
>> you store a "database" of md5 sums of your "blessed" files, so you  
>> don't have to store/redistribute them in case they are big). E.g  
>> put the following code in run_test.cmake:
>>
>> # some argument checking:
>> # test_cmd is the command to run with all its arguments
>> if( NOT test_cmd )
>> message( FATAL_ERROR "Variable test_cmd not defined" )
>> if( NOT test_cmd )
>> # output_blessed contains the name of the "blessed" output file
>> if( NOT output_blessed )
>> message( FATAL_ERROR "Variable output_blessed not defined" )
>> if( NOT output_blessed )
>> # output_test contains the name of the output file the test_cmd  
>> will produce
>> if( NOT output_test )
>> message( FATAL_ERROR "Variable output_test not defined" )
>> if( NOT output_test )
>>
>> execute_command(
>> COMMAND ${test_cmd}
>> COMMAND ${CMAKE_COMMAND} -E compare_files ${output_blessed} $ 
>> {output_test}
>> RESULT_VARIABLE test_not_successful
>> OUTPUT_QUIET
>> ERROR_QUIET
>> )
>>
>> if( test_not_successful )
>> message( SEND_ERROR "${output_test} does not match $ 
>> {output_blessed}!" )
>> endif( test_not_successful )
>>
>>
>>
>> and then in your CMakeLists.txt:
>>
>> add_test( "someImportantTest"
>> ${CMAKE_COMMAND}
>> -Dtest_cmd="${CMAKE_BINARY_DIR}/tests/someImportantTestProgram -- 
>> with arguments"
>> -Doutput_blessed="${CMAKE_SOURCE_DIR}/tests/output/ 
>> someImportatanTestProgram.output"
>> -Doutput_test="${CMAKE_BINARY_DIR}/someImportatanTestProgram.output"
>> -P ${CMAKE_SOURCE_DIR}/CMake/run_test.cmake
>> )
>>
>>
>> If your test program writes to STDOUT you can use the OUTPUT_FILE  
>> option in the execute_command of your run_test.cmake
>>
>> HTH
>>
>> Michael
>

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