tests: cpp: cxx: Add dynamic memory availability test for static init

This commit adds a test to verify that the dynamic memory allocation
service (the `new` operator) is available and functional when the C++
static global object constructors are invoked called during the system
initialisation.

Signed-off-by: Stephanos Ioannidis <[email protected]>
(cherry picked from commit dc4895b)

Author: stephanosio

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

@@ -65,6 +65,17 @@ static void test_global_static_ctor(void)
 	zassert_equal(static_foo.get_foo(), 12345678, NULL);
 }
 
+/*
+ * Check that dynamic memory allocation (usually, the C library heap) is
+ * functional when the global static object constructors are called.
+ */
+foo_class *static_init_dynamic_foo = new foo_class(87654321);
+
+static void test_global_static_ctor_dynmem(void)
+{
+	zassert_equal(static_init_dynamic_foo->get_foo(), 87654321, NULL);
+}
+
 static void test_new_delete(void)
 {
 	foo_class *test_foo = new foo_class(10);
@@ -76,6 +87,7 @@ void test_main(void)
 {
 	ztest_test_suite(cpp_tests,
 			 ztest_unit_test(test_global_static_ctor),
+			 ztest_unit_test(test_global_static_ctor_dynmem),
 			 ztest_unit_test(test_new_delete)
 		);