tests: cpp: cxx: Add static global constructor invocation test

This commit adds a test to verify that the C++ static global object
constructors are invoked called during the system initialisation.

Signed-off-by: Stephanos Ioannidis <[email protected]>
(cherry picked from commit 6e0063a)

Author: stephanosio

tests/subsys/cpp/cxx/src/main.cpp

@@ -57,6 +57,13 @@ static int test_init(const struct device *dev)
 
 SYS_INIT(test_init, APPLICATION, CONFIG_APPLICATION_INIT_PRIORITY);
 
+/* Check that global static object constructors are called. */
+foo_class static_foo(12345678);
+
+static void test_global_static_ctor(void)
+{
+	zassert_equal(static_foo.get_foo(), 12345678, NULL);
+}
 
 static void test_new_delete(void)
 {
@@ -68,6 +75,7 @@ static void test_new_delete(void)
 void test_main(void)
 {
 	ztest_test_suite(cpp_tests,
+			 ztest_unit_test(test_global_static_ctor),
 			 ztest_unit_test(test_new_delete)
 		);