ITK/Release 4/Modularization/ Add tests

Non-regression tests

The same way it used to be, except the newer syntax in "add_test" command:

<syntaxhighlight lang="cmake">

add_executable(itkBinaryThresholdFilterTest itkBinaryThresholdFilterTest.cxx)

target_link_libraries(itkBinaryThresholdFilterTest ${ITK-BinaryThreshold_LIBRARIES})
     
# adopt the modern CMake syntax :[NAME, COMMAND]

itk_add_test(NAME itkBinaryThresholdFilterTest  
        COMMAND itkBinaryThresholdFilterTest input.png output.png)

</syntaxhighlight>

Regression tests:

Approach A

Using the test driver macro The CMake macro "CreateTestDriver" defined in

 Module/Core/TestKernal/CreateTestDriver.cmake

is designed for grouped regression tests in ITK.

All the tests in one module share one test driver.

<syntaxhighlight lang="cmake">

 set(ITK-FooFilterTests
    itkFooFilterTest1.cxx
    itkFooFilterTest2.cxx)

 CreateTestDriver(ITK-FooFilter  "${ITK_FooFilter-Test_LIBRARIES}"  "${ITK-FooFilterTest}")

 itk_add_test(NAME  itkFooFilterTest1
          COMMAND  itk-FooFilterTestDriver  itkFooFilterTest1)

 itk_add_test(NAME  itkFooFilterTest2
          COMMAND  itk-FooFilterTestDriver  itkFooFilterTest2)

</syntaxhighlight>

You can find Approach A used in most of the ITK modules. for example in

   ITK/Modules/IO/BMP/test/CMakeLists.txt

Approach B

Stand-alone regression tests

There is also a test driver executable("itkTestdriver") designed for stand-alone regression tests. For instance, all the tests in Examples are stand-alone programs each has its own main function call, in which case, the approach A is not appropriate.

<syntaxhighlight lang="cmake">

  add_exectuable(itkFooTest itkFooTest.cxx)

  target_line_libraries( itkFooTest ${ITK_LIBRARIES})

  itk_add_test(NAME  itkFooTest
           COMMAND  itkTestDriver
           --compare  outputBaseline.png output.png
                      $<TARGET_FILE:itkFooFilterTest> input.png output.png)

</syntaxhighlight>

The new syntax

    $<TARGET_FILE: xxx> 

in the add_test command triggers CMake to locate the executable automatically. No need to specify the path for the executable here.

You can find Approach B used in Examples.

For example in

 ITK/Examples/Filtering/test/CMakeLists.txt