public void TestIsProperSubsetOf()
{
var set = new TestSet <int>
{
1, 2, 3, 4
};
Assert.False(set.IsProperSubsetOf(new[] { 3, 4, 5 }));
Assert.True(set.IsProperSubsetOf(new[] { 1, 2, 3, 4, 5 }));
Assert.False(set.IsProperSubsetOf(new[] { 1, 2, 3, 4 }));
}