module about_unions; import dunit; import helpers; //union definition union IpAddressV4 { ubyte[4] bytes; uint value; } class AboutUnions { mixin UnitTest; @Test public void union_size() { const auto sz = IpAddressV4.sizeof; assertEquals(sz, FILL_IN_THIS_NUMBER); } @Test public void union_assignment() { const auto ip=IpAddressV4([127,0,0,1]); assertEquals(ip.value, FILL_IN_THIS_NUMBER); } }