public void DateTime_ComparesDateTime(string left, string right, int expected)
{
Func <string, DateTime> converter = str => DateTime.ParseExact(str, "dd/MM/yyyy", CultureInfo.InvariantCulture);
var subject = new StringRepresentationComparer <DateTime>(converter);
Assert.That(subject.Compare(left, right), Is.EqualTo(expected));
}
public void Integers_ComparesIntNotString(string left, string right, int expected)
{
Func <string, int> converter = int.Parse;
var subject = new StringRepresentationComparer <int>(converter);
Assert.That(subject.Compare(left, right), Is.EqualTo(expected));
}
public void Strings_SameAsDefaultComparison(string left, string right, int expected)
{
Func <string, string> converter = str => str;
var subject = new StringRepresentationComparer <string>(converter);
Assert.That(subject.Compare(left, right), Is.EqualTo(left.CompareTo(right)));
Assert.That(subject.Compare(left, right), Is.EqualTo(expected));
}
public void Clients_DoNotHaveToCareAboutNulls()
{
var notNull = "1";
var chainable = new StringRepresentationComparer <int>(int.Parse);
Assert.That(chainable.Compare(notNull, null), Is.GreaterThan(0));
Assert.That(chainable.Compare(null, notNull), Is.LessThan(0));
Assert.That(chainable.Compare(null, null), Is.EqualTo(0));
}
public void Compare_ComparedIntegers_HonoringDirection()
{
Func <string, int> converter = int.Parse;
var subject = new StringRepresentationComparer <int>(converter, Direction.Ascending);
Assert.That(subject.Compare("1", "2"), Is.LessThan(0));
subject = new StringRepresentationComparer <int>(converter, Direction.Descending);
Assert.That(subject.Compare("1", "2"), Is.GreaterThan(0));
}
public void Explore()
{
string eleven = "11", two = "2";
IComparer <string> normalComparison = StringComparer.OrdinalIgnoreCase;
Assert.That(eleven, Is.LessThan(two).Using(normalComparison));
IComparer <string> representationComparison = new StringRepresentationComparer <int>(int.Parse);
Assert.That(eleven, Is.GreaterThan(two).Using(representationComparison));
}
public void Ctor_SetsDirection()
{
var subject = new StringRepresentationComparer <string>(str => str, Direction.Descending);
Assert.That(subject.SortDirection, Is.EqualTo(Direction.Descending));
}
public void Ctor_DefaultsToAscending()
{
var subject = new StringRepresentationComparer <string>(str => str);
Assert.That(subject.SortDirection, Is.EqualTo(Direction.Ascending));
}
