build: Fix testprocess invocation during "as-installed" tests

During build-time testing, we can use `$<TARGET_FILE:childprocess>` to
pass the just-built childprocess executable to it as an argument, but
during "as-installed" testing we need to use the installed path of
the childprocess executable instead.

Signed-off-by: Simon McVittie <smcv@debian.org>

test/CMakeLists.txt

@@ -102,7 +102,7 @@ define_property(TARGET PROPERTY SDL_NONINTERACTIVE_ARGUMENTS BRIEF_DOCS "Argumen
 define_property(TARGET PROPERTY SDL_NONINTERACTIVE_TIMEOUT BRIEF_DOCS "Timeout for noninteractive executable." FULL_DOCS "Timeout for noninteractive executable.")
 
 macro(add_sdl_test_executable TARGET)
-    cmake_parse_arguments(AST "BUILD_DEPENDENT;NONINTERACTIVE;NEEDS_RESOURCES;TESTUTILS;THREADS;NO_C90;MAIN_CALLBACKS;NOTRACKMEM" "" "DISABLE_THREADS_ARGS;NONINTERACTIVE_TIMEOUT;NONINTERACTIVE_ARGS;SOURCES" ${ARGN})
+    cmake_parse_arguments(AST "BUILD_DEPENDENT;NONINTERACTIVE;NEEDS_RESOURCES;TESTUTILS;THREADS;NO_C90;MAIN_CALLBACKS;NOTRACKMEM" "" "DISABLE_THREADS_ARGS;NONINTERACTIVE_TIMEOUT;NONINTERACTIVE_ARGS;INSTALLED_ARGS;SOURCES" ${ARGN})
     if(AST_UNPARSED_ARGUMENTS)
         message(FATAL_ERROR "Unknown argument(s): ${AST_UNPARSED_ARGUMENTS}")
     endif()
@@ -139,6 +139,11 @@ macro(add_sdl_test_executable TARGET)
     if(AST_NONINTERACTIVE_ARGS)
         set_property(TARGET ${TARGET} PROPERTY SDL_NONINTERACTIVE_ARGUMENTS "${AST_NONINTERACTIVE_ARGS}")
     endif()
+    if(AST_INSTALLED_ARGS)
+        set_property(TARGET ${TARGET} PROPERTY SDL_INSTALLED_ARGUMENTS "${AST_INSTALLED_ARGS}")
+    elseif(AST_NONINTERACTIVE_ARGS)
+        set_property(TARGET ${TARGET} PROPERTY SDL_INSTALLED_ARGUMENTS "${AST_NONINTERACTIVE_ARGS}")
+    endif()
     if(AST_NONINTERACTIVE_TIMEOUT)
         set_property(TARGET ${TARGET} PROPERTY SDL_NONINTERACTIVE_TIMEOUT "${AST_NONINTERACTIVE_TIMEOUT}")
     endif()
@@ -363,7 +368,11 @@ add_sdl_test_executable(testmouse SOURCES testmouse.c)
 add_sdl_test_executable(testoverlay NEEDS_RESOURCES TESTUTILS SOURCES testoverlay.c)
 add_sdl_test_executable(testplatform NONINTERACTIVE SOURCES testplatform.c)
 add_sdl_test_executable(testpower NONINTERACTIVE SOURCES testpower.c)
-add_sdl_test_executable(testprocess NONINTERACTIVE THREADS NONINTERACTIVE_ARGS $<TARGET_FILE:childprocess> SOURCES testprocess.c)
+add_sdl_test_executable(testprocess
+                        NONINTERACTIVE THREADS
+                        NONINTERACTIVE_ARGS $<TARGET_FILE:childprocess>
+                        INSTALLED_ARGS "${CMAKE_INSTALL_FULL_LIBEXECDIR}/installed-tests/SDL3/childprocess${CMAKE_EXECUTABLE_SUFFIX}"
+                        SOURCES testprocess.c)
 add_sdl_test_executable(childprocess SOURCES childprocess.c)
 add_dependencies(testprocess childprocess)
 add_sdl_test_executable(testfilesystem NONINTERACTIVE SOURCES testfilesystem.c)
@@ -593,6 +602,7 @@ function(add_sdl_test TEST TARGET)
             set(command ${TARGET})
         endif()
         get_property(noninteractive_arguments TARGET ${TARGET} PROPERTY SDL_NONINTERACTIVE_ARGUMENTS)
+        get_property(installed_arguments TARGET ${TARGET} PROPERTY SDL_INSTALLED_ARGUMENTS)
         get_property(disable_threads_args TARGET ${TARGET} PROPERTY SDL_DISABLE_THREADS_ARGS)
         get_property(uses_threads TARGET ${TARGET} PROPERTY SDL_THREADS)
         if(noninteractive_arguments)

test/template.test.in

@@ -1,3 +1,3 @@
 [Test]
 Type=session
-Exec=@installedtestsdir@/@exe@ @noninteractive_arguments@
+Exec=@installedtestsdir@/@exe@ @installed_arguments@