public bool Test_IsIn_List_with_comparer(string commaDelimitedArray, string value)
{
var enumerable = commaDelimitedArray == null
? null
: commaDelimitedArray.Split(",".ToCharArray(), StringSplitOptions.RemoveEmptyEntries);
var caseInsensitiveComparer = EqualityComparerFunc <string> .Create((s1, s2) => string.Equals(s1, s2, StringComparison.OrdinalIgnoreCase));
return(value.IsIn(enumerable, caseInsensitiveComparer));
}
public bool Compare_Contains_Tests(int a, int b, int c, int d, int e, int search)
{
Func <int, int, bool> absoluteEqualityFunc = (x, y) =>
{
return(Math.Abs(x) == Math.Abs(y));
};
var list = new[] { a, b, c, d, e };
var contains = list.Contains(search, EqualityComparerFunc <int> .Create(absoluteEqualityFunc));
return(contains);
}
public string Test_Append_CaseInsensitiveComparer(string commaDelimitedArray, string value)
{
var comparer = EqualityComparerFunc <string> .Create(
(s1, s2) => string.Equals(s1, s2, StringComparison.OrdinalIgnoreCase)
);
var enumerable = commaDelimitedArray == null
? null
: commaDelimitedArray.Split(",".ToCharArray(), StringSplitOptions.RemoveEmptyEntries);
var result = enumerable.AppendItem(value, comparer);
return(string.Join(",", result));
}
public void GetHashCode_generates_constant_values(string valueList)
{
Func <int, int, bool> absoluteEqualityFunc = (x, y) =>
{
return(x == y);
};
var comparer = EqualityComparerFunc <int> .Create(absoluteEqualityFunc);
var list = valueList.Split(",".ToCharArray())
.Select(x => Convert.ToInt32(x))
.ToList();
var hashCodes = list
.Select(x => comparer.GetHashCode(x));
hashCodes
.All(hc => hc.Equals(0)).ShouldBeTrue();
}
/// <summary>
/// Appends the specified item instance.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="enumerable">The enumerable.</param>
/// <param name="instance">The instance.</param>
/// <returns>IEnumerable<T>.</returns>
public static IEnumerable <T> AppendItem <T>(this IEnumerable <T> enumerable, T instance)
{
var falseComparer = EqualityComparerFunc <T> .Create((arg1, arg2) => false);
return(enumerable.AppendItem(instance, falseComparer));
}