Import TestTargets helper module from starling

TestTargets.cmake

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+# Helper functions for creating cmake targets to build and run test suites
+#
+# This module defines several cmake targets which support building and running 
+# tests. 2 external function are available with subtle differences, 
+# swift_add_test() and swift_add_test_runner()
+#
+# swift_add_test() defines a new test suite to be built from a list of sources 
+# with options for linking libraries and including extra source directories. 
+# Basic usage is
+#
+# swift_add_test(test-suite-name
+#    SRCS
+#      main.cc
+#      ...more source files
+#    LINK
+#      ...link libraries
+#    INCLUDE
+#      ...extra include directories
+#    )
+#
+# This will create 2 cmake targets
+# - test-suite-name - an executable composed of the specified source files, 
+#   linked against the specified libraries
+# - do-test-suite-name - A custom target which will execute the above target
+#
+#
+# LINK and INCLUDE are optional parameters. 
+#
+# All tests will have their language standards set to the swift default by
+# using the LanguageStandards module, and have code coverage enabled
+#
+# An optional parameter PARALLEL can be passed which will create an additional 
+# target to run tests in parallel.
+#
+# swift_add_test(test-suite-name
+#   PARALLEL
+#   SRCS ...srcs...
+#   )
+#
+# will create an extra target parallel-test-suite-name. This target only makes 
+# sense for gtest based test suites and uses the parallel test helper program 
+# from the googletest package. The non-parallel target is always created.
+#
+# The other function, swift_add_test_runner(), can be used to create a do-... 
+# target which pointer at some other command. This can be used to invoke a test 
+# which is actually a shell script or some other executable which is available 
+# but not built from source
+#
+# swift_add_test_runner(test-suite-name
+#    COMMAND <shell-command-to-run-test>
+#    DEPENDS <optional list of cmake targets on which this test depend>
+#    )
+#
+# This will create just a single target:
+# - do-test-suite-name - Execute the given command
+#
+# Both functions can take an optional argument COMMENT which will print out a 
+# nicer status message when the test is run
+#
+# swift_add_test(test-suite-name
+#    SRCS <list of source>
+#    COMMENT "Performing some tests"
+#    )
+#
+# This module will create some extra global targets to build and run all tests
+# - build-all-tests - Build all specified tests
+# - do-all-tests - Execute all specified tests
+#
+# In addition tests can be added with the option POST_BUILD which will cause 
+# cmake to execute those tests as part of the 'all' target. To assist this 
+# functionality this module will create some extra targets
+#
+# - build-post-build-tests - Build all tests which have been marked as POST_BUILD
+# - do-post-build-tests - Run all tests which have been marked as POST_BUILD
+#
+# To specify a test to be run as part of 'make all' simply pass the option POST_BUILD
+#
+# swift_add_test(test-suite-name
+#    POST_BUILD
+#    SRCS ...srcs
+#    LINK ...libraries
+#    )
+#
+# or
+#
+# swift_add_test_runner(test-suite-name
+#    POST_BUILD
+#    COMMAND <path to executable>
+#    )
+#
+# Dependency chains are set up so that post build tests will be run towards the 
+# end of the build process. Cmake lacks functionality to run commands as a 
+# post-build step so it is not guaranteed that tests will run after everything 
+# has been built, just that they will run very late in the process. This should 
+# give a chance for compiler errors to surface before tests are run
+#
+# A command line option AUTORUN_TESTS can be specified (ON by default) to 
+# control whether or not tests run as part of 'make all'.
+#
+# cmake -DAUTORUN_TESTS=OFF <path to source>
+#
+# will disable post build tests from running as part of 'make all'. The post-build 
+# targets will still be created and can be invoked manually.
+#
+
+include(LanguageStandards)
+include(CodeCoverage)
+
+option(AUTORUN_TESTS "Automatically run post-build tests as part of 'all' target" ON)
+if(AUTORUN_TESTS)
+  set(autorun ALL)
+endif()
+
+if(NOT TARGET build-all-tests)
+  add_custom_target(build-all-tests)
+endif()
+
+if(NOT TARGET do-all-tests)
+  add_custom_target(do-all-tests)
+endif()
+
+if(NOT TARGET build-post-build-tests)
+  add_custom_target(build-post-build-tests ${autorun})
+endif()
+
+if(NOT TARGET do-post-build-tests)
+  add_custom_target(do-post-build-tests ${autorun})
+endif()
+
+function(swift_add_test_runner target)
+  set(argOption "POST_BUILD")
+  set(argSingle "COMMENT")
+  set(argMulti "COMMAND" "DEPENDS")
+
+  cmake_parse_arguments(x "${argOption}" "${argSingle}" "${argMulti}" ${ARGN})
+
+  if(x_UNPARSED_ARGUMENTS)
+    message(FATAL_ERROR "swift_add_test unparsed arguments - ${x_UNPARSED_ARGUMENTS}")
+  endif()
+
+  if(NOT x_COMMENT)
+    set(x_COMMENT "test ${target}")
+  endif()
+
+  add_custom_target(
+      do-${target}
+      COMMAND ${x_COMMAND}
+      COMMENT "Running ${x_COMMENT}"
+      )
+  add_dependencies(do-all-tests do-${target})
+  if(x_DEPENDS)
+    add_dependencies(do-${target} ${x_DEPENDS})
+  endif()
+
+  if(x_POST_BUILD)
+    add_custom_target(post-build-${target}
+        COMMAND ${x_COMMAND}
+        COMMENT "Running post build ${x_COMMENT}"
+        )
+    add_dependencies(do-post-build-tests post-build-${target})
+    add_dependencies(post-build-${target} build-post-build-tests)
+    if(x_DEPENDS)
+      add_dependencies(post-build-${target} ${x_DEPENDS})
+      add_dependencies(build-post-build-tests ${x_DEPENDS})
+    endif()
+  endif()
+endfunction()
+
+function(swift_add_test target)
+  set(argOption "PARALLEL" "POST_BUILD")
+  set(argSingle "COMMENT")
+  set(argMulti "SRCS" "LINK" "INCLUDE")
+
+  cmake_parse_arguments(x "${argOption}" "${argSingle}" "${argMulti}" ${ARGN})
+
+  if(x_UNPARSED_ARGUMENTS)
+    message(FATAL_ERROR "swift_add_test unparsed arguments - ${x_UNPARSED_ARGUMENTS}")
+  endif()
+
+  if(NOT x_SRCS)
+    message(FATAL_ERROR "swift_add_test must be passed at least one source file")
+  endif()
+
+  if(NOT x_COMMENT)
+    set(x_COMMENT "test ${target}")
+  endif()
+
+  add_executable(${target} EXCLUDE_FROM_ALL ${x_SRCS})
+  swift_set_language_standards(${target})
+  if(x_INCLUDE)
+    target_include_directories(${target} PRIVATE ${x_INCLUDE})
+  endif()
+  if(x_LINK)
+    target_link_libraries(${target} PRIVATE ${x_LINK})
+  endif()
+
+  add_custom_target(
+      do-${target}
+      COMMAND ${target}
+      COMMENT "Running ${x_COMMENT}"
+      )
+  add_dependencies(do-${target} ${target})
+  target_code_coverage(${target} AUTO ALL)
+
+  if(x_PARALLEL)
+    add_custom_target(parallel-${target}
+        COMMAND ${PROJECT_SOURCE_DIR}/third_party/gtest-parallel/gtest-parallel $<TARGET_FILE:${target}>
+        COMMENT "Running ${x_COMMENT} in parallel"
+        )
+    add_dependencies(parallel-${target} ${target})
+  endif()
+
+  add_dependencies(build-all-tests ${target})
+  add_dependencies(do-all-tests do-${target})
+
+  if(x_POST_BUILD)
+    add_custom_target(
+        post-build-${target}
+        COMMAND ${target}
+        COMMENT "Running post build ${x_COMMENT}"
+        )
+    add_dependencies(do-post-build-tests post-build-${target})
+    add_dependencies(build-post-build-tests ${target})
+    add_dependencies(post-build-${target} build-post-build-tests)
+  endif()
+endfunction()