void do_test_e (SortedSet<int> s1, IEnumerable<int> s2, bool o, bool se = false, bool psb = false, bool psu = false)
{
bool sb = false, su = false;
if (se)
sb = su = true;
if (psb)
sb = true;
if (psu)
su = true;
Assert.IsTrue (!su || !psb);
Assert.IsTrue (!sb || !psu);
// actual tests
Assert.AreEqual (o, s1.Overlaps (s2));
Assert.AreEqual (se, s1.SetEquals (s2));
Assert.AreEqual (sb, s1.IsSubsetOf (s2));
Assert.AreEqual (su, s1.IsSupersetOf (s2));
Assert.AreEqual (psb, s1.IsProperSubsetOf (s2));
Assert.AreEqual (psu, s1.IsProperSupersetOf (s2));
}
