public void equals_or_contains()
{
const int a = 0;
const int b = 1;
const int c = 2;
const int d = 3;
const int e = 54;
var ae = new SourceSpan(new SourceLocation(a, 1, 1), e - a);
var ac = new SourceSpan(new SourceLocation(a, 1, 1), c - a);
var ce = new SourceSpan(new SourceLocation(c, 2, 1), e - c);
var bd = new SourceSpan(new SourceLocation(b, 1, 2), d - b);
Assert.IsTrue(ae.EqualsOrContains(ae));
Assert.IsTrue(ae.EqualsOrContains(ac));
Assert.IsTrue(ae.EqualsOrContains(ce));
Assert.IsTrue(ae.EqualsOrContains(bd));
Assert.IsFalse(ac.EqualsOrContains(ae));
Assert.IsTrue(ac.EqualsOrContains(ac));
Assert.IsFalse(ac.EqualsOrContains(ce));
Assert.IsFalse(ac.EqualsOrContains(bd));
Assert.IsFalse(ce.EqualsOrContains(ae));
Assert.IsFalse(ce.EqualsOrContains(ac));
Assert.IsTrue(ce.EqualsOrContains(ce));
Assert.IsFalse(ce.EqualsOrContains(bd));
Assert.IsFalse(bd.EqualsOrContains(ae));
Assert.IsFalse(bd.EqualsOrContains(ac));
Assert.IsFalse(bd.EqualsOrContains(ce));
Assert.IsTrue(bd.EqualsOrContains(bd));
}