public void Combinatorics_GetPermutations_OneString_ShouldNotContainsDuplicates()
{
ICombinatorics combinator = new Combinatorics();
var combinations = combinator.GetPermutation("albero");
var duplicateItems = combinations.GroupBy(x => x).Where(grouped => grouped.Count() > 1).Select(grouped => grouped.Key);
Assert.IsTrue(!duplicateItems.Any());
}
public void Combinatorics_GetPermutations_OneString_ShouldReturn_Combinatorics()
{
ICombinatorics combinator = new Combinatorics();
var combinations = combinator.GetPermutation("pippo");
Assert.IsTrue(combinations.Any());
}
public void Combinatorics_GetPermutations_OneCharString_ShouldReturn_SameString()
{
ICombinatorics combinator = new Combinatorics();
var combinations = combinator.GetPermutation("a");
Assert.IsTrue(combinations.FirstOrDefault() == "a");
}
public void Combinatorics_GetPermutations_Null_ShouldReturn_EmptyStringList()
{
ICombinatorics combinator = new Combinatorics();
var combinations = combinator.GetPermutation(null);
Assert.IsTrue(!combinations.Any());
}