/// <summary>
/// Compares two primitives.
/// </summary>
/// <param name="current"></param>
/// <param name="next"></param>
/// <returns></returns>
/// <remarks>Cases when at least one is null, or they are different types are handled in <see cref="CreateDifferenceTree"/>.</remarks>
public static DifferenceItem FromPrimitive(PrimitiveObjectTreeItem current, PrimitiveObjectTreeItem next)
{
// first check is currently redundant, but it might come handy if StateFormatter cached objects
if (!ReferenceEquals(current, next) &&
!ReferenceEquals(current.Source, next.Source) && !Equals(current.Value, next.Value))
{
return(new DifferenceItem(current, next, DiffType.Modified));
}
return(null);
}
public void WhenSameSourceSamePropertySameValue_ReturnsNull()
{
var source = new PrimitiveData("tn", 1);
var current = new PrimitiveObjectTreeItem(source.Value, null, "pn", source);
var next = new PrimitiveObjectTreeItem(source.Value, null, "pn", source);
var actual = TreeComparer.FromPrimitive(current, next);
Assert.That(actual, Is.Null);
}
public void WhenDifferentSourceSamePropertyDifferentValue_DifferenceItemIsMarkedAsModified()
{
var currentSource = new PrimitiveData("tn", 1);
var nextSource = new PrimitiveData("tn", 2);
var current = new PrimitiveObjectTreeItem(currentSource.Value, null, "pn", currentSource);
var next = new PrimitiveObjectTreeItem(nextSource.Value, null, "pn", nextSource);
var actual = TreeComparer.FromPrimitive(current, next);
Assert.That(actual.DiffType, Is.EqualTo(DiffType.Modified));
}
public void WhenDifferentSourceSamePropertyDifferentValue_ReturnsDifferenceItem()
{
var currentSource = new PrimitiveData("tn", 1);
var nextSource = new PrimitiveData("tn", 2);
var current = new PrimitiveObjectTreeItem(currentSource.Value, null, "pn", currentSource);
var next = new PrimitiveObjectTreeItem(nextSource.Value, null, "pn", nextSource);
var actual = TreeComparer.FromPrimitive(current, next);
Assert.That(actual, Is.Not.Null);
}
public void WhenDifferentSourceSamePropertyDifferentValue_DifferenceItemContainsBothItems()
{
var currentSource = new PrimitiveData("tn", 1);
var nextSource = new PrimitiveData("tn", 2);
var current = new PrimitiveObjectTreeItem(currentSource.Value, null, "pn", currentSource);
var next = new PrimitiveObjectTreeItem(nextSource.Value, null, "pn", nextSource);
var actual = TreeComparer.FromPrimitive(current, next);
Assert.That(actual.Current, Is.SameAs(current));
Assert.That(actual.Next, Is.SameAs(next));
}
