using System;
using System.Collections;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using System.Linq.Expressions;
using System.Reflection;
using NUnit.Framework;
using NUnit.Framework.Constraints;
using NUnit.Framework.SyntaxHelpers;
using OpenMetaverse;
using OpenSim.Framework;
namespace OpenSim.Data.Tests
{
public static class Constraints
{
//This is here because C# has a gap in the language, you can't infer type from a constructor
public static PropertyCompareConstraint<T> PropertyCompareConstraint<T>(T expected)
{
return new PropertyCompareConstraint<T>(expected);
}
}
public class PropertyCompareConstraint<T> : NUnit.Framework.Constraints.Constraint
{
private readonly object _expected;
//the reason everywhere uses propertyNames.Reverse().ToArray() is because the stack is backwards of the order we want to display the properties in.
private string failingPropertyName = string.Empty;
private object failingExpected;
private object failingActual;
public PropertyCompareConstraint(T expected)
{
_expected = expected;
}
public override bool Matches(object actual)
{
return ObjectCompare(_expected, actual, new Stack<string>());
}
private bool ObjectCompare(object expected, object actual, Stack<string> propertyNames)
{
if (actual.GetType() != expected.GetType())
{
propertyNames.Push("GetType()");
failingPropertyName = string.Join(".", propertyNames.Reverse().ToArray());
propertyNames.Pop();
failingActual = actual.GetType();
failingExpected = expected.GetType();
return false;
}
if(actual.GetType() == typeof(Color))
{
Color actualColor = (Color) actual;
Color expectedColor = (Color) expected;
if (actualColor.R != expectedColor.R)
{
propertyNames.Push("R");
failingPropertyName = string.Join(".", propertyNames.Reverse().ToArray());
propertyNames.Pop();
failingActual = actualColor.R;
failingExpected = expectedColor.R;
return false;
}
if (actualColor.G != expectedColor.G)
{
propertyNames.Push("G");
failingPropertyName = string.Join(".", propertyNames.Reverse().ToArray());
propertyNames.Pop();
failingActual = actualColor.G;
failingExpected = expectedColor.G;
return false;
}
if (actualColor.B != expectedColor.B)
{
propertyNames.Push("B");
failingPropertyName = string.Join(".", propertyNames.Reverse().ToArray());
propertyNames.Pop();
failingActual = actualColor.B;
failingExpected = expectedColor.B;
return false;
}
if (actualColor.A != expectedColor.A)
{
propertyNames.Push("A");
failingPropertyName = string.Join(".", propertyNames.Reverse().ToArray());
propertyNames.Pop();
failingActual = actualColor.A;
failingExpected = expectedColor.A;
return false;
}
return true;
}
//Skip static properties. I had a nasty problem comparing colors because of all of the public static colors.
PropertyInfo[] properties = expected.GetType().GetProperties(BindingFlags.Public | BindingFlags.Instance);
foreach (var property in properties)
{
if (ignores.Contains(property.Name))
continue;
object actualValue = property.GetValue(actual, null);
object expectedValue = property.GetValue(expected, null);
//If they are both null, they are equal
if (actualValue == null && expectedValue == null)
continue;
//If only one is null, then they aren't
if (actualValue == null || expectedValue == null)
{
propertyNames.Push(property.Name);
failingPropertyName = string.Join(".", propertyNames.Reverse().ToArray());
propertyNames.Pop();
failingActual = actualValue;
failingExpected = expectedValue;
return false;
}
IComparable comp = actualValue as IComparable;
if (comp != null)
{
if (comp.CompareTo(expectedValue) != 0)
{
propertyNames.Push(property.Name);
failingPropertyName = string.Join(".", propertyNames.Reverse().ToArray());
propertyNames.Pop();
failingActual = actualValue;
failingExpected = expectedValue;
return false;
}
continue;
}
IEnumerable arr = actualValue as IEnumerable;
if (arr != null)
{
List<object> actualList = arr.Cast<object>().ToList();
List<object> expectedList = ((IEnumerable)expectedValue).Cast<object>().ToList();
if (actualList.Count != expectedList.Count)
{
propertyNames.Push(property.Name);
propertyNames.Push("Count");
failingPropertyName = string.Join(".", propertyNames.Reverse().ToArray());
failingActual = actualList.Count;
failingExpected = expectedList.Count;
propertyNames.Pop();
propertyNames.Pop();
}
//Todo: A value-wise comparison of all of the values.
//Everything seems okay...
continue;
}
propertyNames.Push(property.Name);
if (!ObjectCompare(expectedValue, actualValue, propertyNames))
return false;
propertyNames.Pop();
}
return true;
}
public override void WriteDescriptionTo(MessageWriter writer)
{
writer.WriteExpectedValue(failingExpected);
}
public override void WriteActualValueTo(MessageWriter writer)
{
writer.WriteActualValue(failingActual);
writer.WriteLine();
writer.Write(" On Property: " + failingPropertyName);
}
//These notes assume the lambda: (x=>x.Parent.Value)
//ignores should really contain like a fully dotted version of the property name, but I'm starting with small steps
readonly List<string> ignores = new List<string>();
public PropertyCompareConstraint<T> IgnoreProperty(Expression<Func<T, object>> func)
{
Expression express = func.Body;
PullApartExpression(express);
return this;
}
private void PullApartExpression(Expression express)
{
//This deals with any casts... like implicit casts to object. Not all UnaryExpression are casts, but this is a first attempt.
if (express is UnaryExpression)
PullApartExpression(((UnaryExpression)express).Operand);
if (express is MemberExpression)
{
//If the inside of the lambda is the access to x, we've hit the end of the chain.
// We should track by the fully scoped parameter name, but this is the first rev of doing this.
if (((MemberExpression)express).Expression is ParameterExpression)
{
ignores.Add(((MemberExpression)express).Member.Name);
}
else
{
//Otherwise there could be more parameters inside...
PullApartExpression(((MemberExpression)express).Expression);
}
}
}
}
[TestFixture]
public class PropertyCompareConstraintTest
{
public class HasInt
{
public int TheValue { get; set; }
}
[Test]
public void IntShouldMatch()
{
HasInt actual = new HasInt { TheValue = 5 };
HasInt expected = new HasInt { TheValue = 5 };
var constraint = Constraints.PropertyCompareConstraint(expected);
Assert.That(constraint.Matches(actual), Is.True);
}
[Test]
public void IntShouldNotMatch()
{
HasInt actual = new HasInt { TheValue = 5 };
HasInt expected = new HasInt { TheValue = 4 };
var constraint = Constraints.PropertyCompareConstraint(expected);
Assert.That(constraint.Matches(actual), Is.False);
}
[Test]
public void IntShouldIgnore()
{
HasInt actual = new HasInt { TheValue = 5 };
HasInt expected = new HasInt { TheValue = 4 };
var constraint = Constraints.PropertyCompareConstraint(expected).IgnoreProperty(x=>x.TheValue);
Assert.That(constraint.Matches(actual), Is.True);
}
[Test]
public void AssetShouldMatch()
{
UUID uuid1 = UUID.Random();
AssetBase actual = new AssetBase(uuid1, "asset one");
AssetBase expected = new AssetBase(uuid1, "asset one");
var constraint = Constraints.PropertyCompareConstraint(expected);
Assert.That(constraint.Matches(actual), Is.True);
}
[Test]
public void AssetShouldNotMatch()
{
UUID uuid1 = UUID.Random();
AssetBase actual = new AssetBase(uuid1, "asset one");
AssetBase expected = new AssetBase(UUID.Random(), "asset one");
var constraint = Constraints.PropertyCompareConstraint(expected);
Assert.That(constraint.Matches(actual), Is.False);
}
[Test]
public void AssetShouldNotMatch2()
{
UUID uuid1 = UUID.Random();
AssetBase actual = new AssetBase(uuid1, "asset one");
AssetBase expected = new AssetBase(uuid1, "asset two");
var constraint = Constraints.PropertyCompareConstraint(expected);
Assert.That(constraint.Matches(actual), Is.False);
}
[Test]
public void TestColors()
{
Color actual = Color.Red;
Color expected = Color.FromArgb(actual.A, actual.R, actual.G, actual.B);
var constraint = Constraints.PropertyCompareConstraint(expected);
Assert.That(constraint.Matches(actual), Is.True);
}
}
}