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Program 2
using System;
using NUnit.Framework;

[TestFixture]
public class SetTest{

  Set<int> set1, set2, set3, set4;

  [SetUp] 
  public void Init(){
    set1 = new Set<int>();
    set2 = new Set<int>(10);
    set3 = new Set<int>(new int[]{1,2,3});
    set4 = new Set<int>(set3);
  }

  [Test]
  public void MemberTest(){
    Assert.IsFalse(set1.Member(1), "Member test 1");
    Assert.IsFalse(set2.Member(1), "Member test 2");
    Assert.IsTrue(set3.Member(1), "Member test 3");
    Assert.IsTrue(set4.Member(1), "Member test 4");
    Assert.IsFalse(set3.Member(4), "Member test 5");
    Assert.IsFalse(set4.Member(4), "Member test 6");
  }    

  [Test]
  public void InsertNonMember(){
    set1.Insert(1); 
    Assert.AreEqual(set1.Count, 1,  "Insert test 1");
    Assert.IsTrue(set1.Member(1), "Insert test 2");

    set3.Insert(4);
    Assert.AreEqual(set3.Count, 4,  "Insert test 3");

    set4.Insert(4);
    Assert.AreEqual(set4.Count, 4,  "Insert test 4");
  }  


  [Test]
  public void InsertMember(){
    set1.Insert(1);  set1.Insert(1);
    Assert.AreEqual(set1.Count, 1,  "Insert test 1");
    Assert.IsTrue(set1.Member(1), "Insert test 2");

    set3.Insert(3);
    Assert.AreEqual(set3.Count, 3,  "Insert test 3");

    set4.Insert(3);
    Assert.AreEqual(set4.Count, 3,  "Insert test 4");
  }  

  [Test]
  public void DeleteNonMember(){
    set1.Delete(1); 
    Assert.AreEqual(set1.Count, 0,  "Delete test 1");

    set3.Delete(4); 
    Assert.AreEqual(set3.Count, 3,  "Delete test 2");
  }

  [Test]
  public void DeleteMember(){
    set3.Delete(1); 
    Assert.AreEqual(set3.Count, 2,  "Delete test 1");
    Assert.IsFalse(set3.Member(1),  "Delete test 2");
  }

  // Delete member twice
  [Test]
  public void DeleteMemberTwice(){
    set3.Delete(1);  set3.Delete(1); 
    Assert.AreEqual(set3.Count, 2,  "Delete test 1");
    Assert.IsFalse(set3.Member(1),  "Delete test 2");
  }

  [Test]
  public void MultipleDelete(){
    set3.Delete(1);  set3.Delete(2); set3.Delete(3); 
    Assert.AreEqual(set3.Count, 0,  "Delete test 1");
    Assert.IsFalse(set3.Member(1),  "Delete test 2");
    Assert.IsFalse(set3.Member(2),  "Delete test 3");
    Assert.IsFalse(set3.Member(3),  "Delete test 4");
  }


}