tests: Use native GTest utils to generate assets names

tests/meson.build

@@ -6,6 +6,8 @@ envs.set('G_MESSAGES_DEBUG', 'all')
 # Setup paths
 envs.set('MESON_SOURCE_ROOT', meson.project_source_root())
 envs.set('MESON_BUILD_ROOT', meson.project_build_root())
+envs.set('G_TEST_SRCDIR', meson.current_source_dir())
+envs.set('G_TEST_BUILDDIR', meson.current_build_dir())
 envs.prepend('LD_LIBRARY_PATH', meson.project_build_root() / 'libfprint')
 
 # Set FP_DEVICE_EMULATION so that drivers can adapt (e.g. to use fixed
@@ -71,6 +73,12 @@ envs_str = run_command(python3, '-c', env_parser_cmd,
     env: envs,
     check: installed_tests).stdout().strip()
 
+envs_str = ' '.join([
+    envs_str,
+    'G_TEST_SRCDIR=' + installed_tests_testdir,
+    'G_TEST_BUILDDIR=' + installed_tests_execdir,
+])
+
 if get_option('introspection')
     envs.prepend('GI_TYPELIB_PATH', meson.project_build_root() / 'libfprint')
     virtual_devices_tests = [
@@ -247,10 +255,6 @@ endif
 
 unit_tests_deps = { 'fpi-assembling' : [cairo_dep] }
 
-test_config = configuration_data()
-test_config.set_quoted('SOURCE_ROOT', meson.project_source_root())
-test_config_h = configure_file(output: 'test-config.h', configuration: test_config)
-
 foreach test_name: unit_tests
     if unit_tests_deps.has_key(test_name)
         missing_deps = false
@@ -278,7 +282,7 @@ foreach test_name: unit_tests
 
     basename = 'test-' + test_name
     test_exe = executable(basename,
-        sources: [basename + '.c', test_config_h],
+        sources: basename + '.c',
         dependencies: [ libfprint_private_dep ] + extra_deps,
         c_args: common_cflags,
         link_whole: test_utils,