public void TestEquality()
{
HashCollection <int> a = new HashCollection <int> {
1, 2
};
HashCollection <int> b = new HashCollection <int> {
2, 3
};
HashCollection <int> c = new HashCollection <int> {
1, 2
};
Assert.IsFalse(a == b);
Assert.IsTrue(a == c);
Assert.IsFalse(null == a);
Assert.IsFalse(a == null);
Assert.IsTrue(a != b);
Assert.IsFalse(a != c);
Assert.IsTrue(null != a);
Assert.IsTrue(a != null);
Assert.AreNotEqual(a, b);
Assert.AreEqual(a, c);
Assert.AreEqual(a.GetHashCode(), c.GetHashCode());
Assert.IsFalse(a.Equals(b));
Assert.IsTrue(a.Equals(c));
Assert.IsFalse(a.Equals(null));
Assert.IsFalse(a.Equals((ISet)b));
Assert.IsTrue(a.Equals((ISet)c));
Assert.IsFalse(a.Equals((ISet) new HashCollection <int> {
1
}));
Assert.IsFalse(a.Equals((ISet)null));
Assert.IsFalse(a.Equals((IEnumerable)b));
Assert.IsTrue(a.Equals((IEnumerable)c));
Assert.IsFalse(a.Equals((IEnumerable)null));
Assert.IsFalse(a.Equals(new[] { 2, 3 }));
Assert.IsTrue(a.Equals(new[] { 1, 2 }));
Assert.IsFalse(a.Equals((IEnumerable <int>)null));
}