public void DamerauLevenshtein_distance_throws_exception_if_input_string__is_null()
{
var damerauLevenshtein = new DamerauLevenshtein();
Assert.ThrowsException <ArgumentNullException>(() => damerauLevenshtein.CalculateDistance("test", null));
Assert.ThrowsException <ArgumentNullException>(() => damerauLevenshtein.CalculateDistance(null, "test"));
Assert.ThrowsException <ArgumentNullException>(() => damerauLevenshtein.CalculateDistance(null, null));
}
public void DamerauLevenshtein_distance_calculation_if_strings_are_different()
{
var damerauLevenshtein = new DamerauLevenshtein();
Assert.AreEqual(1, damerauLevenshtein.CalculateDistance("test1", "test2"));
Assert.AreEqual(1, damerauLevenshtein.CalculateDistance("test", "tst"));
Assert.AreEqual(1, damerauLevenshtein.CalculateDistance("test", "tset"));
Assert.AreEqual(2, damerauLevenshtein.CalculateDistance("test", "tste"));
Assert.AreEqual(2, damerauLevenshtein.CalculateDistance("test", "etts"));
}
public void DamerauLevenshtein_distance_calculation_with_specified_equality_comparer()
{
var equalityComparer = new Mock <IEqualityComparer <char> >(MockBehavior.Strict);
equalityComparer
.Setup(t => t.Equals(It.IsAny <char>(), It.IsAny <char>()))
.Returns <char, char>((x, y) => x == 't' || y == 't');
var damerauLevenshtein = new DamerauLevenshtein(equalityComparer.Object);
Assert.AreEqual(2, damerauLevenshtein.CalculateDistance("test", "test"));
}
public void DamerauLevenshtein_distance_is_zero_if_the_two_string_are_equal()
{
var damerauLevenshtein = new DamerauLevenshtein();
Assert.AreEqual(0, damerauLevenshtein.CalculateDistance("test", "test"));
}