CMake/Modules/FindXCTest.cmake

# Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
# file LICENSE.rst or https://cmake.org/licensing for details.

#[=======================================================================[.rst:
FindXCTest
----------

.. versionadded:: 3.3

Finds the XCTest framework for writing unit tests in Xcode projects:

.. code-block:: cmake

  find_package(XCTest [...])

.. note::

  Xcode 16 and later includes the Swift Testing framework for writing unit tests
  in the Swift programming language, which supersedes XCTest.

An XCTest bundle is a CFBundle (Core Foundation Bundle) with a special
product type and bundle extension.  See the Apple Developer Library for more
information in the `Testing with Xcode`_ documentation.

.. _Testing with Xcode: https://developer.apple.com/library/archive/documentation/DeveloperTools/Conceptual/testing_with_xcode/

Result Variables
^^^^^^^^^^^^^^^^

This module defines the following variables:

``XCTest_FOUND``
  Boolean indicating whether the XCTest framework and executable were found.

``XCTest_INCLUDE_DIRS``
  Include directories containing the XCTest framework headers needed to use
  XCTest.

``XCTest_LIBRARIES``
  Libraries needed to link against to use XCTest framework.

Cache Variables
^^^^^^^^^^^^^^^

The following cache variables may also be set:

``XCTest_EXECUTABLE``
  The path to the ``xctest`` command-line tool used to execute XCTest bundles.

Commands
^^^^^^^^

When XCTest is found, this module provides the following commands to help
create and run XCTest bundles:

.. command:: xctest_add_bundle

  Creates an XCTest bundle to test a given target:

  .. code-block:: cmake

    xctest_add_bundle(<bundle> <testee> [<sources>...])

  This command creates an XCTest bundle named ``<bundle>`` that will test the
  specified ``<testee>`` target.

  The arguments are:

  ``<bundle>``
    Name of the XCTest bundle to create.  The :prop_tgt:`XCTEST` target
    property will be set on this bundle.

  ``<testee>``
    Name of the target to test.  Supported types for the testee are Frameworks
    and App Bundles.

  ``<sources>...``
    One or more source files to add to the bundle.  If not provided, they must
    be added later using commands like :command:`target_sources`.

  .. note::
    The :variable:`CMAKE_OSX_SYSROOT` variable must be set before using this
    command.

.. command:: xctest_add_test

  Adds an XCTest bundle to the project to be run during the CTest phase:

  .. code-block:: cmake

    xctest_add_test(<name> <bundle>)

  This command registers an XCTest bundle to be executed by :manual:`ctest(1)`.
  The test will be named ``<name>`` and will run the specified ``<bundle>``.

  The arguments are:

  ``<name>``
    Name of the test as it will appear in CTest.

  ``<bundle>``
    Target name of the XCTest bundle.

Examples
^^^^^^^^

Finding XCTest and adding tests:

.. code-block:: cmake

  find_package(XCTest)

  add_library(foo SHARED foo.c)

  if(XCTest_FOUND)
    xctest_add_bundle(TestAppBundle foo source.swift)
    xctest_add_test(app.TestAppBundle TestAppBundle)
  endif()
#]=======================================================================]

set(_PRESERVED_CMAKE_FIND_ROOT_PATH "${CMAKE_FIND_ROOT_PATH}")

if(CMAKE_EFFECTIVE_SYSTEM_NAME STREQUAL "Apple"
   AND NOT CMAKE_SYSTEM_NAME STREQUAL "Darwin")
  # Non-macos systems set the CMAKE_FIND_ROOT_PATH_MODE to "ONLY" which
  # restricts the search paths too much to find XCTest.framework. In
  # contrast to the regular system frameworks which reside within the
  # SDK direectory the XCTest framework is located in the respective
  # platform directory which is not added to the CMAKE_FIND_ROOT_PATH
  # (only to CMAKE_SYSTEM_FRAMEWORK_PATH) and therefore not searched.
  #
  # Until this is properly addressed, temporarily add the platform
  # directory to CMAKE_FIND_ROOT_PATH.
  list(APPEND CMAKE_FIND_ROOT_PATH "${_CMAKE_OSX_SYSROOT_PATH}/../..")
endif()

find_path(XCTest_INCLUDE_DIR
  NAMES "XCTest/XCTest.h"
  DOC "XCTest include directory")
mark_as_advanced(XCTest_INCLUDE_DIR)

find_library(XCTest_LIBRARY
  NAMES XCTest
  DOC "XCTest Framework library")
mark_as_advanced(XCTest_LIBRARY)

set(CMAKE_FIND_ROOT_PATH "${_PRESERVED_CMAKE_FIND_ROOT_PATH}")
unset(_PRESERVED_CMAKE_FIND_ROOT_PATH)

execute_process(
  COMMAND xcrun --find xctest
  OUTPUT_VARIABLE _xcrun_out OUTPUT_STRIP_TRAILING_WHITESPACE
  ERROR_VARIABLE _xcrun_err)
if(_xcrun_out)
  set(XCTest_EXECUTABLE "${_xcrun_out}" CACHE FILEPATH "XCTest executable")
  mark_as_advanced(XCTest_EXECUTABLE)
endif()

include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(XCTest
  REQUIRED_VARS XCTest_LIBRARY XCTest_INCLUDE_DIR XCTest_EXECUTABLE)

if(XCTest_FOUND)
  set(XCTest_INCLUDE_DIRS "${XCTest_INCLUDE_DIR}")
  set(XCTest_LIBRARIES "${XCTest_LIBRARY}")
endif()


function(xctest_add_bundle target testee)
  if(NOT XCTest_FOUND)
    message(FATAL_ERROR "XCTest is required to create a XCTest Bundle.")
  endif()

  if(NOT CMAKE_OSX_SYSROOT)
    message(FATAL_ERROR "Adding XCTest bundles requires CMAKE_OSX_SYSROOT to be set.")
  endif()

  add_library(${target} MODULE ${ARGN})

  set_target_properties(${target} PROPERTIES
    BUNDLE TRUE
    XCTEST TRUE
    XCTEST_TESTEE ${testee})

  target_link_libraries(${target} PRIVATE "-framework Foundation")
  target_link_libraries(${target} PRIVATE ${XCTest_LIBRARIES})
  target_include_directories(${target} PRIVATE ${XCTest_INCLUDE_DIRS})

  # retrieve testee target type
  if(NOT TARGET ${testee})
    message(FATAL_ERROR "${testee} is not a target.")
  endif()
  get_property(_testee_type TARGET ${testee} PROPERTY TYPE)
  get_property(_testee_framework TARGET ${testee} PROPERTY FRAMEWORK)
  get_property(_testee_macosx_bundle TARGET ${testee} PROPERTY MACOSX_BUNDLE)

  if(_testee_type STREQUAL "SHARED_LIBRARY" AND _testee_framework)
    # testee is a Framework
    target_link_libraries(${target} PRIVATE ${testee})

  elseif(_testee_type STREQUAL "STATIC_LIBRARY")
    # testee is a static library
    target_link_libraries(${target} PRIVATE ${testee})

  elseif(_testee_type STREQUAL "EXECUTABLE" AND _testee_macosx_bundle)
    # testee is an App Bundle
    add_dependencies(${target} ${testee})
    if(XCODE)
      set_target_properties(${target} PROPERTIES
        XCODE_ATTRIBUTE_BUNDLE_LOADER "$(TEST_HOST)"
        XCODE_ATTRIBUTE_TEST_HOST "$<TARGET_FILE:${testee}>")
      # TEST_HOST overrides ${target}'s artifact path, but the relative
      # path from TEST_HOST to ${testee}'s PlugIns folder must not leave
      # ${target}'s TARGET_BUILD_DIR.  If the project sets an explicit
      # RUNTIME_OUTPUT_DIRECTORY for ${testee}, put ${target} there too.
      # If not, just suppress the project's CMAKE_LIBRARY_OUTPUT_DIRECTORY.
      get_property(testee_RUNTIME_OUTPUT_DIRECTORY TARGET ${testee} PROPERTY RUNTIME_OUTPUT_DIRECTORY)
      set_property(TARGET ${target} PROPERTY LIBRARY_OUTPUT_DIRECTORY ${testee_RUNTIME_OUTPUT_DIRECTORY})
    else()
      target_link_options(${target}
        PRIVATE "SHELL:-bundle_loader \"$<TARGET_FILE:${testee}>\"")
    endif()

  else()
    message(FATAL_ERROR "Testee ${testee} is of unsupported type.")
  endif()
endfunction()


function(xctest_add_test name bundle)
  if(NOT XCTest_EXECUTABLE)
    message(FATAL_ERROR "XCTest executable is required to register a test.")
  endif()

  # check that bundle is an XCTest Bundle

  if(NOT TARGET ${bundle})
    message(FATAL_ERROR "${bundle} is not a target.")
  endif()

  get_property(_test_type TARGET ${bundle} PROPERTY TYPE)
  get_property(_test_bundle TARGET ${bundle} PROPERTY BUNDLE)
  get_property(_test_xctest TARGET ${bundle} PROPERTY XCTEST)

  if(NOT _test_type STREQUAL "MODULE_LIBRARY"
       OR NOT _test_xctest OR NOT _test_bundle)
    message(FATAL_ERROR "Test ${bundle} is not an XCTest Bundle")
  endif()

  # get and check testee properties

  get_property(_testee TARGET ${bundle} PROPERTY XCTEST_TESTEE)
  if(NOT TARGET ${_testee})
    message(FATAL_ERROR "${_testee} is not a target.")
  endif()

  get_property(_testee_type TARGET ${_testee} PROPERTY TYPE)
  get_property(_testee_framework TARGET ${_testee} PROPERTY FRAMEWORK)
  get_property(_testee_macosx_bundle TARGET ${_testee} PROPERTY MACOSX_BUNDLE)

  # Determine the path to the test module artifact on disk.
  set(_test_bundle_dir "$<TARGET_BUNDLE_DIR:${bundle}>")
  if(XCODE AND _testee_type STREQUAL "EXECUTABLE" AND _testee_macosx_bundle)
    # Xcode's TEST_HOST setting places the test module inside the testee bundle.
    if(XCODE_VERSION VERSION_GREATER_EQUAL 7.3)
      # The Xcode "new build system" used a different path until Xcode 12.5.
      if(CMAKE_XCODE_BUILD_SYSTEM EQUAL 12 AND
          XCODE_VERSION VERSION_LESS 12.5 AND
          NOT CMAKE_SYSTEM_NAME STREQUAL "Darwin")
        set(_test_bundle_dir "$<TARGET_BUNDLE_CONTENT_DIR:${_testee}>")
      else()
        set(_test_bundle_dir "$<TARGET_BUNDLE_CONTENT_DIR:${_testee}>/PlugIns")
      endif()
      string(APPEND _test_bundle_dir "/$<TARGET_BUNDLE_DIR_NAME:${bundle}>")
    endif()
  endif()

  # register test

  # There's no target used for this command, so we don't need to do anything
  # here for CMP0178.
  add_test(
    NAME ${name}
    COMMAND ${XCTest_EXECUTABLE} ${_test_bundle_dir})

  # point loader to testee in case rpath is disabled

  if(_testee_type STREQUAL "SHARED_LIBRARY" AND _testee_framework)
    set_property(TEST ${name} APPEND PROPERTY
      ENVIRONMENT DYLD_FRAMEWORK_PATH=$<TARGET_LINKER_FILE_DIR:${_testee}>/..)
  endif()
endfunction()