public void TestHasFollowersMethod()
{
var milkyWay = new MilkyWay();
Assert.IsFalse(milkyWay.HasFollowers());
var solarSystem = new SolarSystem();
milkyWay.Precedes(solarSystem);
Assert.IsTrue(milkyWay.HasFollowers());
}
public void TestPrecederOfFollower()
{
// setup
var milkyWay = new MilkyWay();
var solarSystem = new SolarSystem();
milkyWay.Precedes(solarSystem);
var solarSystemPreceders = solarSystem.Preceders;
var solarSystemHasPreceder = solarSystemPreceders.TryGetValue(typeof(MilkyWay), out var solarSystemPreceder);
// assertions
Assert.IsNotNull(solarSystemPreceders);
Assert.IsTrue(solarSystemHasPreceder);
Assert.AreSame(solarSystemPreceder, milkyWay);
}
public void TestFollowerOfPreceder()
{
// setup
var milkyWay = new MilkyWay();
var solarSystem = new SolarSystem();
milkyWay.Precedes(solarSystem);
var milkyWayFollowers = milkyWay.Followers;
var milkyWayHasFollower = milkyWayFollowers.TryGetValue(typeof(SolarSystem), out var milkyWayFollower);
// assertions
Assert.IsTrue(milkyWayHasFollower);
Assert.IsNotNull(milkyWayFollowers);
Assert.AreSame(milkyWayFollower, solarSystem);
}
public void TestExceptionThrownWhenCallingRedundantFollowAfterPrecede()
{
var milkyWay = new MilkyWay();
var solarSystem = new SolarSystem();
milkyWay.Precedes(solarSystem);
try
{
solarSystem.Follows(milkyWay);
}
catch (ArgumentException)
{
Assert.Pass();
}
Assert.Fail("Expected ArgumentException (attempted to assign node relationship twice " +
"-- redundant call to a.Follows(b) when already called b.Precedes(a)).");
}
public void TestCount()
{
// test 0 nodes added
Assert.AreEqual(this.nodeCollection.Count(), 0);
// test 1 nodes added
var lmc = new LMC();
this.nodeCollection.Add(lmc);
Assert.AreEqual(this.nodeCollection.Count(), 1);
// test 2 nodes added
var milkyWay = new MilkyWay();
this.nodeCollection.Add(milkyWay);
Assert.AreEqual(this.nodeCollection.Count(), 2);
// adding a follower should not increase collection count
var solarSystem = new SolarSystem();
milkyWay.Precedes(solarSystem);
Assert.AreEqual(this.nodeCollection.Count(), 2);
}
