Signed-off-by: Njiaxugangzz <jiaxugang@huawei.com>

Change-Id: I3fc5207a8a33ed55aa87dbeed4f3cab980d825ce

Change-Id: Ifa7abdc64184136acf9392c38eef7585de711c87

In many places checking for nullptr is done using EXPECT test macros
that doesn't return from the function when condition is not met
(i.e. they are non-fatal). Lack of further error handling results
in a subsequent segfault. To avoid that in most places it's sufficient
to change macro type to ASSERT.
Signed-off-by: NRobert Drab <robert.drab@huawei.com>