public void TestString_01()
{
var notaset = ForString.Related(Equal, "a").Complement();
var bset = ForString.Related(Equal, "b");
var intersect = bset.Intersect(notaset);
Assert.False(intersect.Any(Equal, "c"));
}
public void TestString_Cov_01()
{
var s1 = ForString.Related(Equal, "a");
var s2 = ForString.Related(Equal, "b");
Assert.True(s1.Intersect(s2).IsEmpty);
Assert.True(s1.Complement().Union(s2.Complement()).Complement().IsEmpty);
Assert.Equal(s1.Union(s2).Complement(), s1.Complement().Intersect(s2.Complement()));
IValueSet b = s1;
Assert.Same(b.Intersect(b), b);
Assert.Same(b.Union(b), b);
Assert.False(s1.Union(s2).All(Equal, "a"));
}