private static Assertable <T> SingleImpl <T, TT>(Assertable <TT> a, IReadOnlyList <T> sample)
where TT : IEnumerable <T>
{
if (sample.Count == 0)
{
throw a.Exception("Collection is empty, expected exactly one item");
}
if (sample.Count > 1)
{
var coll = string.Join(", ", a.Item.Select(x => x.ToString()));
throw a.Exception($"Collection has more than one element, expected exactly one item. Collection: \n{coll}");
}
return(new Assertable <T>(sample[0], a.UseAssertionException));
}
public static Assertable <T> Null <T>(this Assertable <T> a)
{
if (a.Item != null)
{
throw a.Exception("Object is not null, Expected=null");
}
return(a);
}
public static Assertable <T> True <T>(this Assertable <T> a, Func <T, bool> shouldBeTrue, string errorMsg)
{
if (!shouldBeTrue(a.Item))
{
throw a.Exception($"Condition '{errorMsg}' is false, Expected=true");
}
return(a);
}
public static Assertable <T> NotEqual <T>(this Assertable <T> a, T notExpected)
{
if (object.Equals(a.Item, notExpected))
{
throw a.Exception($"Objects are equal: Actual({a.Item?.ToString()}) == Expected({notExpected?.ToString()})");
}
return(a);
}
public static Assertable <T> Equal <T>(this Assertable <T> a, T expected)
{
if (!object.Equals(a.Item, expected))
{
throw a.Exception($"Objects are not equal: Actual({a.Item?.ToString()}) <> Expected({expected?.ToString()})");
}
return(a);
}