/// <summary>
/// nUnit uses IComparer for CollectionAssert
/// Note: this is not a comparer that makes sense for sorting.
/// </summary>
/// <returns>
/// 0 if <paramref name="x"/> and <paramref name="y"/> are equal.
/// -1 if not equal.
/// </returns>
int IComparer.Compare(object x, object y)
{
var comparison = DeepEqualsNode.CreateFor(x, y);
if (comparison.Matches())
{
return(0);
}
return(-1);
}
private DeepEqualsNode(
DeepEqualsNode parent,
FieldInfo parentField,
ICompared expected,
ICompared actual,
List<ComparedPair> compared)
: this(expected, actual, compared)
{
this.Parent = parent;
this.ParentField = parentField;
}
private DeepEqualsNode(
DeepEqualsNode parent,
FieldInfo parentField,
ICompared expected,
ICompared actual,
List <ComparedPair> compared)
: this(expected, actual, compared)
{
this.Parent = parent;
this.ParentField = parentField;
}
private static IReadOnlyList <ICompared> GetPath(this DeepEqualsNode deepEqualsNode)
{
var path = new List <ICompared>();
while (deepEqualsNode != null)
{
path.Add(deepEqualsNode.Expected);
deepEqualsNode = deepEqualsNode.Parent;
}
path.Reverse();
return(path);
}
/// <summary>
/// Checks:
/// - All fields and nested fields.
/// - All elements of Enumerables.
/// </summary>
/// <typeparam name="T">The type of <paramref name="x"/> and <paramref name="y"/></typeparam>
/// <param name="x">The first value</param>
/// <param name="y">The second value</param>
public static void Equal <T>(T x, T y)
{
var comparison = DeepEqualsNode.CreateFor(x, y);
if (comparison.Matches())
{
return;
}
using (var writer = new StringWriter())
{
var children = comparison.AllChildren()
.Where(c => !c.Children.Any() && !c.Matches())
.Take(6)
.ToArray();
if (children.Length == 1)
{
writer.WriteLine(" Found this difference between expected and actual:");
}
else if (children.Length <= 5)
{
writer.WriteLine($" Fields differ between expected and actual, here are the {children.Length} differences:");
}
else if (children.Length > 5)
{
writer.WriteLine($" Fields differ between expected and actual, here are the first 5 differences:");
}
var lastIndex = Math.Min(5, children.Length);
for (int i = 0; i < lastIndex; i++)
{
if (i != 0)
{
writer.WriteLine();
writer.WriteLine();
}
var leaf = children[i];
var path = GetPath(leaf);
writer.Write(" expected");
WritePath(writer, path, leaf.Expected.Value);
writer.WriteLine();
writer.Write(" actual");
WritePath(writer, path, leaf.Actual.Value);
}
var message = writer.ToString();
throw new AssertException(message);
}
}
/// <inheritdoc/>
public bool Equals(T x, T y)
{
var comparison = DeepEqualsNode.CreateFor(x, y);
return(comparison.Matches());
}
