Test forwarding of arguments to FetchCOntent_Declare

Author: CraigHutchinson

test/unit/forward_arguments.cmake

@@ -0,0 +1,53 @@
+cmake_minimum_required(VERSION 3.14 FATAL_ERROR)
+
+include(${CPM_PATH}/CPM.cmake)
+include(${CPM_PATH}/testing.cmake)
+
+# Intercept underlying `FetchContent_Declare`
+function(FetchContent_Declare)
+    set_property(GLOBAL PROPERTY last_FetchContent_Declare_ARGN "${ARGN}")
+endfunction()
+cpm_declare_fetch(  PACKAGE VERSION INFO EMPTY "" ANOTHER )
+
+# TEST:`cpm_declare_fetch` shall forward empty arguments
+get_property(last_FetchContent_Declare_ARGN GLOBAL PROPERTY last_FetchContent_Declare_ARGN)
+assert_equal("${last_FetchContent_Declare_ARGN}" "PACKAGE;EMPTY;;ANOTHER")
+
+# TEST:`CPMDeclarePackage` shall store all including empty
+CPMDeclarePackage( FOO EMPTY "" ANOTHER )
+assert_equal("${CPM_DECLARATION_FOO}" "EMPTY;;ANOTHER")
+
+# Stub the actual fetch
+set(fibonacci_POPULATED YES)
+set(fibonacci_SOURCE_DIR ".")
+set(fibonacci_BINARY_DIR ".")
+macro(FetchContent_GetProperties)
+endmacro()
+
+# TEST:`CPMAddPackage` shall call `FetchContent_declare` with unmodified 
+# arguments including any Empty-string arguments
+CPMAddPackage(
+  NAME fibonacci
+  GIT_REPOSITORY https://github.com/cpm-cmake/testpack-fibonacci.git
+  VERSION 1.2.3
+  EMPTY_OPTION ""
+  COMMAND_WITH_EMPTY_ARG foo "" bar
+)
+get_property(last_FetchContent_Declare_ARGN GLOBAL PROPERTY last_FetchContent_Declare_ARGN)
+assert_equal("${last_FetchContent_Declare_ARGN}"
+    "fibonacci;EMPTY_OPTION;;COMMAND_WITH_EMPTY_ARG;foo;;bar;GIT_REPOSITORY;https://github.com/cpm-cmake/testpack-fibonacci.git;GIT_TAG;v1.2.3")
+
+# Intercept underlying `cpm_add_package_multi_arg`
+function(cpm_add_package_multi_arg)
+    set_property(GLOBAL PROPERTY last_cpm_add_package_multi_arg_ARGN "${ARGN}")
+endfunction()
+
+# TEST: CPM Module file shall store all arguments including empty strings
+include(${CPM_MODULE_PATH}/Findfibonacci.cmake)
+get_property(last_cpm_add_package_multi_arg_ARGN GLOBAL PROPERTY last_cpm_add_package_multi_arg_ARGN)
+assert_equal("${last_cpm_add_package_multi_arg_ARGN}"
+    "NAME;fibonacci;GIT_REPOSITORY;https://github.com/cpm-cmake/testpack-fibonacci.git;VERSION;1.2.3;EMPTY_OPTION;;COMMAND_WITH_EMPTY_ARG;foo;;bar")
+
+# remove generated files
+file(REMOVE_RECURSE ${CPM_MODULE_PATH})
+file(REMOVE ${CPM_PACKAGE_LOCK_FILE})