public void SimpleIntersectionWithDuplicates()
{
var fisA = new List <FileInfo>
{
new FileInfo("z:\\a.txt"),
new FileInfo("z:\\b.txt"),
new FileInfo("z:\\b.txt")
};
var fisB = new List <FileInfo>
{
new FileInfo("z:\\b.txt"),
new FileInfo("z:\\b.txt"),
new FileInfo("z:\\c.txt")
};
var fisI = File.Intersection(fisA, fisB);
Assert.AreEqual(1, fisI.Count);
Assert.IsTrue(fisI.Any(f => f.FullName == "z:\\b.txt"));
// nothing has changed
Assert.AreEqual(3, fisA.Count);
Assert.IsTrue(fisA.Any(f => f.FullName == "z:\\a.txt"));
Assert.AreEqual(2, fisA.Count(f => f.FullName == "z:\\b.txt"));
Assert.AreEqual(3, fisB.Count);
Assert.IsTrue(fisB.Any(f => f.FullName == "z:\\b.txt"));
Assert.AreEqual(2, fisB.Count(f => f.FullName == "z:\\b.txt"));
}
public void IntersectionBothNull()
{
var fisI = File.Intersection(null, null);
Assert.IsInstanceOf <List <FileInfo> >(fisI);
Assert.AreEqual(0, fisI.Count);
}
public void IntersectionSecondListIsNullList()
{
var fis = new List <FileInfo>
{
new FileInfo("z:\\a.txt"),
new FileInfo("z:\\b.txt")
};
var fisI = File.Intersection(fis, null);
Assert.IsInstanceOf <List <FileInfo> >(fisI);
Assert.AreEqual(0, fisI.Count);
Assert.AreEqual(2, fis.Count);
Assert.IsTrue(fis.Any(f => f.FullName == "z:\\a.txt"));
Assert.IsTrue(fis.Any(f => f.FullName == "z:\\b.txt"));
}
public void NoIntersectionAtAll()
{
var fisA = new List <FileInfo>
{
new FileInfo("z:\\a.txt")
};
var fisB = new List <FileInfo>
{
new FileInfo("z:\\b.txt")
};
var fisI = File.Intersection(fisA, fisB);
Assert.AreEqual(0, fisI.Count);
Assert.IsInstanceOf <List <FileInfo> >(fisI);
// nothing has changed
Assert.AreEqual(1, fisA.Count);
Assert.IsTrue(fisA.Any(f => f.FullName == "z:\\a.txt"));
Assert.AreEqual(1, fisB.Count);
Assert.IsTrue(fisB.Any(f => f.FullName == "z:\\b.txt"));
}
public void ExactIntersection()
{
var fisA = new List <FileInfo>
{
new FileInfo("z:\\a.txt")
};
var fisB = new List <FileInfo>
{
new FileInfo("z:\\a.txt")
};
var fisI = File.Intersection(fisA, fisB);
Assert.AreEqual(1, fisI.Count);
Assert.IsTrue(fisI.Any(f => f.FullName == "z:\\a.txt"));
// nothing has changed
Assert.AreEqual(1, fisA.Count);
Assert.IsTrue(fisA.Any(f => f.FullName == "z:\\a.txt"));
Assert.AreEqual(1, fisB.Count);
Assert.IsTrue(fisB.Any(f => f.FullName == "z:\\a.txt"));
}