test: split out the unit tests into a separate test suite

All the bits that test for utility functions to work correctly can be run
separately from the main test suite (which tests devices and libinput in
general). These bits here are the ones that test the code itself and aren't
reliant on anything else.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>

meson.build

@@ -807,6 +807,18 @@ if get_option('tests')
 					  install : false)
 	test('test-library-version', test_library_version)
 
+	test_utils_sources = [
+		'src/libinput-util.h',
+		'src/libinput-util.c',
+		'test/test-utils.c',
+	]
+	test_utils = executable('test-utils',
+				test_utils_sources,
+				include_directories : [includes_src, includes_include],
+				dependencies : deps_litest,
+				install: false)
+	test('test-utils', test_utils)
+
 	libinput_test_runner_sources = litest_sources + [
 		'src/libinput-util.h',
 		'src/libinput-util.c',