Don't fail error suite tests (different ways to report founded assert fails: as error or as predicted and ok)

[ladisgin]

Use ASSERT_DEATH, ASSERT_THROW, etc for error suite tests.

[ladisgin]

Don't fail tests only if assert, throw in function that we call

[tyuldashev]

One another example for similar (same?) problem:
for following code

int pow(int x)
{
    if (x >= 1000) // too much
    {
        exit(1);
    }

    return x * x;
}

One of regression test is:

TEST(regression, pow_test_1)
{
    int actual = pow(1000);
    EXPECT_EQ(0, actual);
}

which fails during execution.