```cmake
set(DOCUMENTATION "This module contains a filter to compute the strain tensor
field from a displacement field image.")

itk_module(Strain
  DEPENDS
    ITKCommon
    ITKImageGradient
    ITKImageSources
  TEST_DEPENDS
    ITKTestKernel
    ITKDisplacementField
  EXCLUDE_FROM_DEFAULT
  DESCRIPTION
    "${DOCUMENTATION}"
)
```

Fix module test missing ITKIOVTK dependency.
user
```cmake
set(DOCUMENTATION "This module contains a filter to compute the strain tensor
field from a displacement field image.")

itk_module(Strain
  DEPENDS
    ITKCommon
    ITKImageGradient
    ITKImageSources
  TEST_DEPENDS
    ITKTestKernel
    ITKDisplacementField
    ITKIOVTK
  EXCLUDE_FROM_DEFAULT
  DESCRIPTION
    "${DOCUMENTATION}"
)
```
assistant