tests: Use specific g_assert_ functions
While waiting for my CI tests to run I came across #64 (closed)
So I patiently and artisanally replaced all generic g_assert()
for the relevant specific version
FYI I didn't break apart long g_assert()
expressions to avoid accidentally dropping some unknowable, implicit, test logic that's not immediately obvious.
(This might need !76 (merged) to properly pass CI)
Fixes: #64 (closed)
Edited by Philip Withnall