public void ComparerThrowsIfSecondaryComparerIsNull()
{
IComparer <ChainedComparerTestItem> primary = new KeySelectorComparer <ChainedComparerTestItem, int>(i => i.A);
IComparer <ChainedComparerTestItem> secondary = null;
Assert.Throws <ArgumentNullException>(() => new ChainedComparer <ChainedComparerTestItem>(primary, secondary));
}
public void ComparerInitialises()
{
IComparer <ChainedComparerTestItem> primary = new KeySelectorComparer <ChainedComparerTestItem, int>(i => i.A);
IComparer <ChainedComparerTestItem> secondary = new KeySelectorComparer <ChainedComparerTestItem, int>(i => i.B);
var comparer = new ChainedComparer <ChainedComparerTestItem>(primary, secondary);
Assert.IsNotNull(comparer);
}
public void KeySelectorComparerReturnsZeroWhenFirstItemIsNullAndSecondItemIsNull()
{
var comparer = new KeySelectorComparer <KeySelectorTestItem, int>(i => i.Id);
KeySelectorTestItem first = null;
KeySelectorTestItem second = null;
var result = comparer.Compare(first, second);
Assert.AreEqual(0, result);
}
public void KeySelectorComparerRetunsNegativeOneWhenFirstItemIsNullAndSecondItemIsNot()
{
var comparer = new KeySelectorComparer <KeySelectorTestItem, int>(i => i.Id);
KeySelectorTestItem first = null;
KeySelectorTestItem second = new KeySelectorTestItem {
Id = 1
};
var result = comparer.Compare(first, second);
Assert.AreEqual(-1, result);
}
public void KeySelectorComparerReturnsZeroWhenFirstKeyIsEqualToSecondKey()
{
var comparer = new KeySelectorComparer <KeySelectorTestItem, int>(i => i.Id);
var first = new KeySelectorTestItem {
Id = 1
};
var second = new KeySelectorTestItem {
Id = 1
};
var result = comparer.Compare(first, second);
Assert.AreEqual(0, result);
}
public void KeySelectorComparerReturnsNegativeOneWhenFirstKeyIsLessThanSecondKey()
{
var comparer = new KeySelectorComparer <KeySelectorTestItem, int>(i => i.Id);
var first = new KeySelectorTestItem {
Id = 1
};
var second = new KeySelectorTestItem {
Id = 2
};
var result = comparer.Compare(first, second);
Assert.AreEqual(-1, result);
}
public void ComparerReturnsPositiveOneWhenFirstItemIsGreaterThanSecondItemOnSecondaryComparer()
{
IComparer <ChainedComparerTestItem> primary = new KeySelectorComparer <ChainedComparerTestItem, int>(i => i.A);
IComparer <ChainedComparerTestItem> secondary = new KeySelectorComparer <ChainedComparerTestItem, int>(i => i.B);
var comparer = new ChainedComparer <ChainedComparerTestItem>(primary, secondary);
var first = new ChainedComparerTestItem {
A = 1, B = 2
};
var second = new ChainedComparerTestItem {
A = 1, B = 1
};
int result = comparer.Compare(first, second);
Assert.AreEqual(1, result);
}
public void ComparerReturnsZeroWhenFirstItemIsEqualToSecondItemOnBothPrimaryAndSecondaryComparers()
{
IComparer <ChainedComparerTestItem> primary = new KeySelectorComparer <ChainedComparerTestItem, int>(i => i.A);
IComparer <ChainedComparerTestItem> secondary = new KeySelectorComparer <ChainedComparerTestItem, int>(i => i.B);
var comparer = new ChainedComparer <ChainedComparerTestItem>(primary, secondary);
var first = new ChainedComparerTestItem {
A = 1, B = 1
};
var second = new ChainedComparerTestItem {
A = 1, B = 1
};
int result = comparer.Compare(first, second);
Assert.AreEqual(0, result);
}
public void KeySelectorComparerInitialises()
{
var comparer = new KeySelectorComparer <KeySelectorTestItem, int>(i => i.Id);
Assert.IsNotNull(comparer);
}
