public void EnumerableEqualityComparerReturnsTrueIfFirstAndSecondAreBothNull()
{
var comparer = new EnumerableComparer <int>();
IEnumerable <int> first = null;
IEnumerable <int> second = null;
bool result = comparer.Equals(first, second);
Assert.IsTrue(result);
}
public void EnumerableEqualityComparerReturnsFalseIfFirstIsGreaterLengthThanSecond()
{
var comparer = new EnumerableComparer <int>();
IEnumerable <int> first = new List <int> {
1, 2, 3, 4, 5
};
IEnumerable <int> second = new List <int>();
bool result = comparer.Equals(first, second);
Assert.IsFalse(result);
}
public void EnumerableEqualityComparerReturnsFalseIfSecondListIsNull()
{
var comparer = new EnumerableComparer <int>();
IEnumerable <int> first = new List <int> {
1, 2, 3, 4, 5
};
IEnumerable <int> second = null;
bool result = comparer.Equals(first, second);
Assert.IsFalse(result);
}
public void EnumerableEqualityComparerReturnsTrueIfSequencesAreSameReference()
{
var comparer = new EnumerableComparer <int>();
IEnumerable <int> first = new List <int> {
1, 2, 3, 4, 5
};
IEnumerable <int> second = first;
bool result = comparer.Equals(first, second);
Assert.IsTrue(result);
}
public void EnumerableEqualityComparerReturnsFalseIfFirstAndSecondSequenceElementsAreTheSameButDifferentOrder()
{
var comparer = new EnumerableComparer <int>();
IEnumerable <int> first = new List <int> {
1, 2, 3, 4, 5
};
IEnumerable <int> second = new List <int> {
5, 4, 3, 2, 1
};
bool result = comparer.Equals(first, second);
Assert.IsFalse(result);
}
public void EnumerableEqualityComparerReturnsFalseIfFirstAndSecondSequenceElementsAreNotTheSame()
{
var comparer = new EnumerableComparer <int>();
IEnumerable <int> first = new List <int> {
1, 2, 3, 4, 5
};
IEnumerable <int> second = new List <int> {
6, 7, 8, 9, 10
};
bool result = comparer.Equals(first, second);
Assert.IsFalse(result);
}
/// <summary>
/// Tries to update the property that the selector uses.
/// </summary>
/// <param name="newDocument">
/// The new version of the document. Only non-null items are updated in the current document.
/// </param>
/// <param name="delta">
/// The delta document. Has all changes that differ from the document.
/// </param>
/// <param name="selector">
/// Returns the <see cref="IEnumerable{T}"/> to update.
/// </param>
/// <typeparam name="T">
/// The type of the items in the selector.
/// </typeparam>
/// <returns>
/// True if the document was updated, false otherwise.
/// </returns>
private bool TryUpdate <T>(SerializableDocumentDescriptor newDocument, SerializableDocumentDescriptor delta, [NotNull] Expression <Func <SerializableDocumentDescriptor, IReadOnlyList <T> > > selector)
{
var propertyInfo = (PropertyInfo)((MemberExpression)selector.Body).Member;
var getValue = selector.Compile();
var newValue = getValue(newDocument);
var existingValue = getValue(this.Descriptor);
if (newValue == null || existingValue != null && EnumerableComparer.Equals(newValue, existingValue))
{
return(false);
}
propertyInfo.SetValue(delta, newValue);
propertyInfo.SetValue(this.Descriptor, newValue);
return(true);
}